text to speech voice synthesizer

Realistic Text-to-Speech AI converter

Create realistic Voiceovers online! Insert any text to generate speech and download audio mp3 or wav for any purpose. Speak a text with AI-powered voices.You can convert text to voice for free for reference only. For all features, purchase the paid plans

How to convert text into speech?

• Just type some text or import your written content
• Press "generate" button
• Download MP3 / WAV

Full list of benefits of neural voices

Multi-voice editor.

Dialogue with AI Voices . You can use several voices at once in one text.

Over 1000 Natural Sounding Voices

Crystal-clear voice over like a Human. Males, females, children's, elderly voices.

You spend little on re-dubbing the text. Limits are spent only for changed sentences in the text. Read more about our cost-effective Limit System . Enjoy full control over your spending with one-time payments for only what you use. Pay as you go : get flexible, cost-effective access to our neural network voiceover services without subscriptions.

If your Limit balance is sufficient, you can use a single query to convert a text of up to 2,000,000 characters into speech.

Commercial Use

You can use the generated audio for commercial purposes. Examples: YouTube, Tik Tok, Instagram, Facebook, Twitch, Twitter, Podcasts, Video Ads, Advertising, E-book, Presentation and other.

Custom voice settings

Change Speed, Pitch, Stress, Pronunciation, Intonation , Emphasis , Pauses and more. SSML support .

SRT to audio

Subtitles to Audio : Convert your subtitle file into perfectly timed multilingual voiceovers with our advanced neural networks.

Downloadable TTS

You can download converted audio files in MP3, WAV, OGG for free.

Powerful support

We will help you with any questions about text-to-speech. Ask any questions, even the simplest ones. We are happy to help.

Compatible with editing programs

Works with any video creation software: Adobe Premier, After effects, Audition, DaVinci Resolve, Apple Motion, Camtasia, iMovie, Audacity, etc.

Cloud save your history

All your files and texts are automatically saved in your profile on our cloud server. Add tracks to your favorites in one click.

Use our text to voice converter to make videos with natural sounding speech!

Say goodbye to expensive traditional audio creation

Cheap price. Create a professional voiceover in real time for pennies. it is 100 times cheaper than a live speaker.

Traditional audio creation

• Expensive live speakers, high prices
• A long search for freelancers and studios
• Editing requires complex tools and knowledge
• The announcer in the studio voices a long time. It takes time to give him a task and accept it.

• Affordable tts generation starting at $0.08 per 1000 characters
• Website accessible in your browser right now
• Intuitive interface, suitable for beginners
• SpeechGen generates text from speech very quickly. A few clicks and the audio is ready.

Create AI-generated realistic voice-overs.

Ways to use. Cases.

See how other people are already using our realistic speech synthesis. There are hundreds of variations in applications. Here are some of them.

• Voice over for videos. Commercial, YouTube, Tik Tok, Instagram, Facebook, and other social media. Add voice to any videos!
• E-learning material. Ex: learning foreign languages, listening to lectures, instructional videos.
• Advertising. Increase installations and sales! Create AI-generated realistic voice-overs for video ads, promo, and creatives.
• Public places. Synthesizing speech from text is needed for airports, bus stations, parks, supermarkets, stadiums, and other public areas.
• Podcasts. Turn text into podcasts to increase content reach. Publish your audio files on iTunes, Spotify, and other podcast services.
• Mobile apps and desktop software. The synthesized ai voices make the app friendly.
• Essay reader. Read your essay out loud to write a better paper.
• Presentations. Use text-to-speech for impressive PowerPoint presentations and slideshow.
• Reading documents. Save your time reading documents aloud with a speech synthesizer.
• Book reader. Use our text-to-speech web app for ebook reading aloud with natural voices.
• Welcome audio messages for websites. It is a perfect way to re-engage with your audience. 
• Online article reader. Internet users translate texts of interesting articles into audio and listen to them to save time.
• Voicemail greeting generator. Record voice-over for telephone systems phone greetings.
• Online narrator to read fairy tales aloud to children.
• For fun. Use the robot voiceover to create memes, creativity, and gags.

Maximize your content’s potential with an audio-version. Increase audience engagement and drive business growth.

Who uses Text to Speech?

SpeechGen.io is a service with artificial intelligence used by about 1,000 people daily for different purposes. Here are examples.

Video makers create voiceovers for videos. They generate audio content without expensive studio production.

Newsmakers convert text to speech with computerized voices for news reporting and sports announcing.

Students and busy professionals to quickly explore content

Foreigners. Second-language students who want to improve their pronunciation or listen to the text comprehension

Software developers add synthesized speech to programs to improve the user experience.

Marketers. Easy-to-produce audio content for any startups

IVR voice recordings. Generate prompts for interactive voice response systems.

Educators. Foreign language teachers generate voice from the text for audio examples.

Booklovers use Speechgen as an out loud book reader. The TTS voiceover is downloadable. Listen on any device.

HR departments and e-learning professionals can make learning modules and employee training with ai text to speech online software.

Webmasters convert articles to audio with lifelike robotic voices. TTS audio increases the time on the webpage and the depth of views.

Animators use ai voices for dialogue and character speech.

Text to Speech enables brands, companies, and organizations to deliver enhanced end-user experience, while minimizing costs.

Frequently Asked Questions

Convert any text to super realistic human voices. See all tariff plans .

Enhance Your Content Accessibility

Boost your experience with our additional features. Easily convert PDFs, DOCx files, and video subtitles into natural-sounding audio.

📄🔊 PDF to Audio

Transform your PDF documents into audible content for easier consumption and enhanced accessibility.

📝🎧 DOCx to mp3

Easily convert Word documents into speech for listening on the go or for those who prefer audio format

🔊📰 WordPress plugin

Enhance your WordPress site with our plugin for article voiceovers, embedding an audio player directly on your site to boost user engagement and diversify your content.

Supported languages

• Amharic (Ethiopia)
• Arabic (Algeria)
• Arabic (Egypt)
• Arabic (Saudi Arabia)
• Bengali (India)
• Catalan (Spain)
• English (Australia)
• English (Canada)
• English (GB)
• English (Hong Kong)
• English (India)
• English (Philippines)
• German (Austria)
• Hindi India
• Spanish (Argentina)
• Spanish (Mexico)
• Spanish (United States)
• Tamil (India)
• All languages: +76

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Go from text to speech with a versatile AI voice generator

Ai enabled, real people's voices.

Make studio-quality voice overs in minutes. Use Murf’s lifelike AI voices for podcasts, videos, and all your professional presentations

There's a voice for every need

Simple, powerful…pure magic

Get creative with Murf Studio

Diverse AI voices at your fingertips

Add video, music, or image

All-in-one AI voice generator

Go from amateur to studio quality voiceovers

Now collaborate with your team

Reliable and secure. your data, our promise..

Explore Voice overs created using Murf AI Voice Generator

Here are a few examples of natural-sounding voiceovers created using Murf's AI voices for a wide range of use cases spanning promotional videos, explainer videos, elearning content and podcasts.

Advertisements & Promotional Videos

E-Learning Videos

Explainer Videos

Hear from our customers

I like that for other basic and pro pricing packages you have a wealth of options, which you don't usually get within these amounts. My favorite option is the copy/paste feature of text and the separation of it into paragraph and/or sentences and that you can download as a single or as multiple files. This makes the workflow smoother when developing multiple videos or animations.

Murf.ai streamlines the content creation workflow and reduces time/cost for e-learning developers. Many of the computer-generated voices are very realistic, and my organizational training clients are typically very happy with the results. It generates realistic narrations, along with scripts and subtitles in all popular formats.

I recently tried murf.ai and I have to say I am thoroughly impressed. The quality of the generated voice is exceptional and very realistic, which is important for my business needs. The platform is user-friendly and easy to navigate, and the range of voices available is impressive. I was also pleased with the prompt and helpful customer support I received when I had questions. Overall, I highly recommend murf.ai to anyone looking for a high-quality and reliable text-to-speech generator. Keep up the great work!

We've been using Murf for our content production for a while now, and I can say Murf is the best TTS software out there -yes I've tried most of them single-handedly. Our favourite voice avatar is named AVA, She sounds just like your girlfriend next door! And you don't even have to get the PRO plan to get her voice!

Whilst updating our Integrated Management System, we decided to modernise the way we provide our front-line project staff with information and guidance. Rather than written documents, we have created a library of short, animated explainer videos. Murf was the perfect solution to provide the voiceover audio. Our scripts were easily uploaded on the Murf platform. The voices are professional, friendly and very clear. When watching our videos, you would not believe that the voiceover is done with AI

Valuable tool for enhancing e-learning content Murf is a quality, cost-effective solution for creating voiceover narration for our e-learning content. It is easy to use, fast and produces excellent results. It allows us to enhance e-learning content by providing an audio element to enrich content.

Murf is a great tool with the ability to sync high quality voice overs to video. The library of pre-recorded voice options, screen recording is just what you need to help you create a slick video quickly. I would certainly recommend murf.ai to fellow founders and start-ups out there. I will be using your tool again soon!

Murf is a human-sounding AI voice-over that is so close to perfection with many features. Have no qualms to recommend it to others.

@MURFAISTUDIO

Frequently asked questions

The best ai voice generator for creators.

For years, creating good voice overs meant investing hundreds if not thousands of dollars in hiring voice artists, renting a recording studio to get the script recorded, investing in expensive recording equipment (if you are recording from home), and recruiting or outsourcing the entire project to an audio editor to mix the audio and produce a high-quality voiceover. Not to mention, the valuable hours dedicated to the entire process. Even after all this, the quality of the produced audio file may be subpar. 

What if there was an alternative to creating studio-quality voiceovers, and that too from the comfort of your own homes? Introducing Murf AI voice generator, which eliminates the entire process of generating voiceovers manually and enables you to quickly produce human-like voiceovers without any specialized hardware or professional.

Leveraging advanced AI algorithms and deep learning, the realistic online voice generator tool allows you to convert written content into natural-sounding speech, in a matter of just a few minutes. Serving as a voice maker, it helps you create life-like synthetic voices that mimic the tonalities and prosodies of human speech and sound. Unlike other computer generated voice, Murf's AI voices don't sound monotonous and robotic. Rather Murf's TTS voices are super realistic and flawless.

Explore AI voices for any requirement

Murf’s advanced AI algorithms catch the right tone and pick up on every punctuation and exclamation mark from the human voice fed it. As such, the platform's AI voices sound close to a human than one can imagine.

Voice over video

Using Murf’s AI technology, you can add a well-timed AI voiceover to your videos and make them more engaging. Unlike most video editing software, Murf doesn’t require video editing skills.

For example, say you want to create a corporate training module and explainer videos for your staff. Such content demands an expert voice that draws on the essence of professionalism and instills confidence in potential partners. Murf offers different voices—both male and female—that will enhance the quality of your corporate training module.

Voice Editing

Murf also simplifies the process of editing recorded voiceovers. Simply feed your recorded speech onto the Murf Studio and it automatically transcribes the content into an editable text format that you can edit and modify.

You can also remove any unneeded bits and background noise from your recording in the same way that you would delete words from a document, and your voice over will be trimmed accordingly.

Voice Cloning using custom voices

With Murf, you can also create an AI voice clone that delivers life-like diction and the full spectrum of human emotion and conveys all the nuances of human speech. In fact, using the voice cloning service, you can customize your AI voice clone to exhibit different emotions depending on the use case, be it advertisements, IVR, or character voices in games and animation. Murf currently only offers voice cloning services in the English language.

Voice Changer

Murf also supports an AI voice changer feature which offers one access to upload a raw home recording and convert that into a professional quality voice over with the voice of your choice. You don't have to worry about investing in expensive recording equipment, hiring a voice actor, or  renting out a studio. With Murf, you can record your audio files freestyle, and, with the click of a button convert it to studio quality.

The only AI Text to Speech software you need

With its cutting-edge technology and realistic AI voices, Murf is the perfect solution for individuals and businesses looking to enhance their audio content. Let’s explore some of the diverse applications of Murf:

eLearning and Explainer Videos

When it comes to eLearning, Murf can be used to quickly convert text-based educational content into a more convenient audio format that can be shared with students worldwide and in different languages, improving reach and accessibility, all without the need to hire voice actors or record voiceovers manually.

Furthermore, Murf provides a vast pool of voices for any type of explainer video. Be it a deep middle-aged voice for an animation video on the Solar system or a playful young adult voice for a DIY or craft video.

Advertisement and Product Demo

Murf provides an ideal solution for creating captivating advertisements and product demos . With its versatile voice options and customizable speech styles, Murf simplifies ad creation and helps create videos that cut through the clutter.

By utilizing the 120+ voice options, Murf helps businesses identify the right brand voice that helps create connections and trust with the audience. The fast turnaround time is also beneficial in creating product demo videos with the correct pronunciation, emphasis, and pauses in multiple languages.

Audiobooks and Podcasts

For authors, Murf simplifies the process of turning their scripts into engaging audio experiences. With multiple AI-generated voices across languages, accents, tones, and voice styles, Murf can narrate audiobooks in an engaging manner, making them more accessible to a broader audience.

Moreover, podcasters can rely on Murf to generate voiceovers for their podcasts , delivering professional-quality audio content instead of recording their own voice and spending hours editing it. 

Spotify Ads

With the growing popularity of audio advertising on platforms like Spotify, Murf offers a powerful solution for creating impactful Spotify ads campaigns. Murf’s rich features, like pitch, pronunciation, and emphasis, make it a compelling choice for creating Spotify ads in minutes. The ability to add music and background score to your ads without the need for a third-party tool takes things a step further. 

YouTube Videos and Presentations

 Murf is an excellent asset for content creators on YouTube as well as professionals delivering presentations . YouTubers, for example, can convert their scripts into engaging voice overs that captivate viewers by selecting a voice with different accents, such as British, Australian, or American, that is suitable for the topic and content of their video.

Whether educational content, tutorial videos, or corporate presentations, Murf’s high quality voices can greatly improve a bland presentation, making the content more engaging and impactful with lifelike AI voices.

For businesses seeking to optimize their customer service experience, Murf serves as an ideal solution for IVR voice systems. Murf’s TTS enables companies to generate natural-sounding voice prompts and greetings for their IVR systems, creating seamless and personalized customer interactions. The automated, multilingual functionality helps businesses communicate with clarity to their customers worldwide.

An all-in-one voice generator

Murf goes beyond serving as a realistic voice generator to offer a complete voice solution that enables users to not only adjust the pitch, punctuation, emphasis, and other elements to make the AI generated voice sound as compelling as possible but also add media like your video, audio, and image files with your generated voice. 

Using Murf’s ‘Pitch’ feature, you can control the tone in which your message is delivered. Increase or decrease the pitch of the AI voice to convey the information in the way you want to.

The AI voice generator’s ‘Emphasis’ facet, on the other hand, enables you to stress specific words and add that extra force to grab the listener’s attention.

You can also include pauses using Murf’s ‘Pause’ feature to make your narration more gripping and effective.

With Murf's speed feature, you can increase or decrease the rate at which your message is being delivered.

In addition, Murf enables one to include background music to your video or image and sync them with a precisely timed voice over. Murf has a library of royalty music that you can choose from or import audio files of your own. Furthermore, the text to speech platform lets you adjust the ratio of voice to music.

Why Choose Murf?

What makes Murf stand out among other ai text to speech tools is the fact that as an online voice generator, it lets you create quality outputs in a jiffy. From enterprises to small-medium businesses to individual content creators, everybody can generate realistic-sounding voice overs across different ages, languages, and accents using Murf.

Its easy-to-use interface, sleek design, and high-end features make it a must-have tool for someone that wants to create great voiceovers in just minutes. Looking for a high-quality, cost-effective solution for creating voiceover narrations? Murf natural sounding text to speech is your answer.

Murf supports Text to speech in

Important Links

How to create.

Text to speech

An AI Speech feature that converts text to lifelike speech.

Bring your apps to life with natural-sounding voices

Build apps and services that speak naturally. Differentiate your brand with a customized, realistic voice generator, and access voices with different speaking styles and emotional tones to fit your use case—from text readers and talkers to customer support chatbots.

Lifelike synthesized speech

Enable fluid, natural-sounding text to speech that matches the intonation and emotion of human voices.

Customizable text-talker voices

Create a unique AI voice generator that reflects your brand's identity.

Fine-grained text-to-talk audio controls

Tune voice output for your scenarios by easily adjusting rate, pitch, pronunciation, pauses, and more.

Flexible deployment

Run Text to Speech anywhere—in the cloud, on-premises, or at the edge in containers.

Tailor your speech output

Fine-tune synthesized speech audio to fit your scenario.  Define lexicons  and control speech parameters such as pronunciation, pitch, rate, pauses, and intonation with  Speech Synthesis Markup Language  (SSML) or with the  audio content creation tool .

Deploy Text to Speech anywhere, from the cloud to the edge

Run Text to Speech wherever your data resides. Build lifelike speech synthesis into applications optimized for both robust cloud capabilities and edge locality using  containers .

Build a custom voice for your brand

Differentiate your brand with a unique  custom voice . Develop a highly realistic voice for more natural conversational interfaces using the Custom Neural Voice capability, starting with 30 minutes of audio.

Fuel App Innovation with Cloud AI Services

Learn five key ways your organization can get started with AI to realize value quickly.

Comprehensive privacy and security

Documentation.

AI Speech, part of Azure AI Services, is  certified  by SOC, FedRAMP, PCI DSS, HIPAA, HITECH, and ISO.

View and delete your custom voice data and synthesized speech models at any time. Your data is encrypted while it’s in storage.

Your data remains yours. Your text data isn't stored during data processing or audio voice generation.

Backed by Azure infrastructure, AI Speech offers enterprise-grade security, availability, compliance, and manageability.

Comprehensive security and compliance, built in

Microsoft invests more than $1 billion annually on cybersecurity research and development.

We employ more than 3,500 security experts who are dedicated to data security and privacy.

Azure has more certifications than any other cloud provider. View the comprehensive list .

Flexible pricing gives you the power and control you need

Pay only for what you use, with no upfront costs. With Text to Speech, you pay as you go based on the number of characters you convert to audio.

Get started with an Azure free account

After your credit, move to  pay as you go  to keep building with the same free services. Pay only if you use more than your free monthly amounts.

Guidelines for building responsible synthetic voices

Learn about responsible deployment

Synthetic voices must be designed to earn the trust of others. Learn the principles of building synthesized voices that create confidence in your company and services.

Obtain consent from voice talent

Help voice talent understand how neural text-to-speech (TTS) works and get information on recommended use cases.

Be transparent

Transparency is foundational to responsible use of computer voice generators and synthetic voices. Help ensure that users understand when they’re hearing a synthetic voice and that voice talent is aware of how their voice will be used. Learn more with our disclosure design guidelines.

Documentation and resources

Get started.

Read the  documentation

Take the  Microsoft Learn course

Get started with a 30-day learning journey

Explore code samples

Check out the  sample code

See customization resources

Customize your speech solution with  Speech studio . No code required.

Start building with AI Services

Lifelike Text to Speech for Your Users

Make your content and products more engaging with our digital voice solutions

Select your options below to hear samples of ReadSpeaker's TTS voices

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Terms of Service - This demo is for evaluation purpose only; commercial use is strictly forbidden. No static audio files may be produced, downloaded, or distributed. The background music in the voice demo is not included with the purchased product.

Benefits of Text to Speech

Text to speech enables brands, companies, and organizations to deliver enhanced end-user experience, while minimizing costs. Whether you’re developing services for website visitors, mobile app users, online learners, subscribers or consumers, text to speech allows you to respond to the different needs and desires of each user in terms of how they interact with your services, applications, devices, and content.

See All Benefits of Text to Speech

TTS gives access to your content to a greater population, such as those with literacy difficulties, learning disabilities, reduced vision and those learning a language. It also opens doors to anyone else looking for easier ways to access digital content.

If flawless customer experience is at the heart of your business DNA, high-quality TTS voices or exclusive custom voices are both highly effective approaches to increasing your visibility in the voice user interface. TTS helps to enhance the customer journey across different touchpoints, fostering loyalty and setting your company apart from competitors.

Integrators and developers building services, apps, and devices across markets and verticals (e.g. telecoms, utilities, manufacturing, OEM, finance, etc.), benefit from adding speech output to services and applications. Text to speech enables a wider-reaching, more consumer-oriented end-user experience, helping reduce costs and increasing automation while providing personalized customer interactions.

ReadSpeaker is leading the way in text to speech.

ReadSpeaker offers a range of powerful text-to-speech solutions for instantly deploying lifelike, tailored voice interaction in any environment.

With more than 20 years’ experience, ReadSpeaker is “Pioneering Voice Technology” .

customers worldwide

market-leading own-brand voices

voices in 50 languages available in our SaaS solutions

countries with a local office

ReadSpeaker’s Blog

ReadSpeaker’s blog covers a wide variety of topics related to online and offline text to speech, mobile, and web accessibility.

ReadSpeaker’s industry-leading voice expertise leveraged by leading Italian newspaper to enhance the reader experience Milan, Italy. – 19 October, 2023 – ReadSpeaker, the most trusted,…

Accessibility overlays have gotten a lot of bad press, much of it deserved. So what can you do to improve web accessibility? Find out here.

STEM topics are notoriously hard to teach using most text-to-speech programs. Here’s how ReadSpeaker can help students of all abilities learn math.

Confused by all the hype surrounding custom AI voices? These five facts cut through the noise to help you get the TTS voice you need.

Want to get the most out of your Moodle LMS? Then you need to understand the Moodle Certified Partner Network. Learn all about it here.

Building your first Adobe Captivate course? You’ll probably need a voice over. Find out how to produce one here.

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• Assessments
• Text to Speech for K12
• Higher Education
• Corporate Learning
• Learning Management Systems
• Custom Text-To-Speech (TTS) Voices
• Voice Cloning Software
• Text-To-Speech (TTS) Voices
• ReadSpeaker speechMaker Desktop
• ReadSpeaker speechMaker
• ReadSpeaker speechCloud API
• ReadSpeaker speechEngine SAPI
• ReadSpeaker speechServer
• ReadSpeaker speechServer MRCP
• ReadSpeaker speechEngine SDK
• ReadSpeaker speechEngine SDK Embedded
• Accessibility
• Automotive Applications
• Conversational AI
• Entertainment
• Experiential Marketing
• Guidance & Navigation
• Smart Home Devices
• Transportation
• Virtual Assistant Persona
• Voice Commerce
• Customer Stories & e-Books
• About ReadSpeaker
• TTS Languages and Voices
• The Top 10 Benefits of Text to Speech for Businesses
• Learning Library
• e-Learning Voices: Text to Speech or Voice Actors?
• TTS Talks & Webinars

Make your products more engaging with our voice solutions.

• Solutions ReadSpeaker Online ReadSpeaker webReader ReadSpeaker docReader ReadSpeaker TextAid ReadSpeaker Learning Education Assessments Text to Speech for K12 Higher Education Corporate Learning Learning Management Systems ReadSpeaker Enterprise AI Voice Generator Custom Text-To-Speech (TTS) Voices Voice Cloning Software Text-To-Speech (TTS) Voices ReadSpeaker speechCloud API ReadSpeaker speechEngine SAPI ReadSpeaker speechServer ReadSpeaker speechServer MRCP ReadSpeaker speechEngine SDK ReadSpeaker speechEngine SDK Embedded
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#1 TEXT-TO-SPEECH SOFTWARE ON G2

AI voice generator and text-to-speech tool

Generate natural-sounding voiceovers for videos using Synthesia's AI voice generator. No need for microphones, voice actors, or audio recordings. Select the AI voice you'd like to use, type in your text, and click Play to hear the result.

What's the difference between an AI voice generator and traditional text-to-speech?

Text-to-speech software.

Text-to-speech AI tools take written text and convert it into speech using a computer-generated voice. These synthetic voices can sometimes sound robotic or monotonous. TTS is commonly used for navigation systems, screen readers, and automated phone systems. A text-to-speech tool has limited capabilities in terms of naturalness and expressiveness, and may not provide the nuanced intonations and emotions required for sophisticated audio production. Users often prefer using AI voice generators for more emotive content.

AI voice generator

An AI voice generator, on the other hand, uses advanced AI algorithms trained on natural human voices to produce ultra-realistic AI voices and AI narration. AI voice technology doesn’t simply convert text to speech; it creates human-like voices for video voiceovers. AI voiceover generation tools often offer a variety of voice options, languages, and accents, allowing users to select voices that align with their target audience. This technology is particularly valuable for businesses looking to produce high-quality voiceovers for videos, e-learning, and more.

Realistic AI voices for diverse use cases

Customer support.

Create training videos with natural-sounding AI voices in minutes, instead of weeks. Replace boring text-based training manuals with engaging videos.

Generate educational content with lifelike AI voices to increase learners' engagement. Create lectures with voiceovers in just a few clicks.

Improve your customer experience and satisfaction by transforming your knowledge base articles into short videos with natural AI voices.

Keep your employees and stakeholders engaged with natural-sounding and realistic internal communication and corporate videos.

Create professional-looking explainer videos, product videos, and brand videos without hiring a video production or recording studio.

Key features of the AI text-to-voice generator

Choose from 400+ ai voices in 130+ languages.

Effortlessly create content for a global audience in multiple languages. Choose from 400+ high-quality voices in 130+ languages and accents.

Effortlessly clone your voice

Create your own AI voice using Synthesia's built-in voice cloning feature. Generate your own voiceovers without any equipment.

Create AI text-to-speech videos in minutes

Generate natural-sounding AI voiceovers and videos with AI avatars. With Synthesia's AI video editor, there's no need for cameras or microphones.

Translate TTS voiceovers and videos in 1 click

With Synthesia's integrated video translation tool, effortlessly adapt any video and audio content into 70+ languages in just one click.

Collaborate with your team in one place

Save time by working on your AI voice generation projects with multiple team members, all in one place.

Generate scripts with AI and covert to speech

Use the built-in AI script generator to create an engaging video script and transform it into an AI voice over in one place.

Join professionals from 50,000+ leading companies

Create your first AI video with realistic AI voices

Ai voice generators in 130+ languages, generate high-quality ai voices with synthesia, natural-sounding speech.

Synthesia's text-to-voice generator produces the most advanced AI voices in multiple languages and accents, while also allowing you to correct the pronunciation if needed.

Easy-to-use app interface

Synthesia is an intuitive platform that offers AI voice acting and converts text to video seamlessly. All without the need for complex editing tools.

Adjust speech with SSML tags

Fine-tune the AI narration to your liking: emphasize specific words, add pauses, and tweak the pronunciation to create even more lifelike voices.

Automated closed captions

Improve your video's accessibility by automatically generating closed captions that are synced with your AI voiceover and video.

simplify your process

4 benefits of AI text-to-speech tools

• Consistent quality of voiceovers in contrast to traditional voiceover methods
• Instant results : generate voice content using advanced AI voices in seconds
• Improved accessibility for those using screen readers
• Cost reduction: users can save up to 50% compared to traditional voiceover methods

How to create the best AI voiceover using Synthesia

See how you can use Synthesia's powerful features to turn text into audio and video in a matter of minutes.

Create an account

Sign up for Synthesia and create a new video.

Paste your text

Paste your text or generate a script with an AI script generator.

• Choose an AI voice

Choose from 400+ realistic AI voices. The AI text-to-voice generator will automatically convert the written text into speech.

Add an AI narrator

Make the text-to-speech voiceover stand out by adding a realistic avatar to narrate your text.

Adjust and edit

Personalize your text-to-speech video with stock photos or your own images, videos, audio files, shapes, and more.

Generate video with voiceover

That's it! Now you can download, stream, embed, and share your voiceover videos with your audience on social media, YouTube, and other platforms.

Customer stories

Pain points solved by AI voice generation

Faster video creation.

"Synthesia’s AI voiceovers sold me instantly. They give us the ability to pivot and create video content much faster than before"

No actors - no costs

"Relying on external agencies and hiring voiceover actors in multiple language was extremely costly. So it would either mean stretching the budget or no video at all."

Speed, simplicity and ease

"We can record anytime and anywhere with greater speed, simplicity, and ease. It not only optimizes work schedules but also increases productivity and benefits the quality of our educational materials."

AI safety & security

People first, always. We prioritize the secure, safe, and ethical use of artificial intelligence in our product development processes.

SOC 2 & GDPR compliant

Our data handling practices, systems, and processes have been independently audited and certified.

Trust & Safety team

Our Trust and Safety team ensures the protection of your data and the ethical application of AI.

Content moderation policy

We use a combination of human and AI moderation processes to safeguard our community from bad actors.

AI policy and regulations

We actively engage with regulatory bodies and champion the formulation of robust AI policies and regulations.

Learn more about AI-generated speech

Here's everything you need to know about AI text-to-voice technology and its uses.

Artificial Intelligence

9 ways AI speech technologies are revolutionizing user experiences

Discover how AI speech tech is transforming user experiences on digital devices with 9 innovative ways. Explore future trends and ethical considerations.

Leveraging AI TTS for enhanced business efficiency in video and audio content creation

Enhance your audio content creation with AI TTS technology. Discover how to boost efficiency and reach global audiences effortlessly.

Expanding globally with AI: The power of multilingual TTS systems

Discover the power of multilingual TTS systems for global expansion. Enhance communication across languages with AI-driven technology.

12 reasons why Synthesia is the best AI voice generator

Effortless ai narration.

Tired of spending hours searching for the right voice-acting professionals? Struggling with self-recording? Our voice generation tool automates the narration process. Just paste or type your text, and watch as it's transformed into a natural human voice in just a few minutes.

Save time and money

Traditional voice recording is time-consuming and expensive. With AI there's no need to hire voice actors or buy expensive equipment. You reduce your voiceover costs by 50% and cut 95% of your video production time.

400+ different voices

Whether you need a friendly and engaging voice for YouTube videos or professional voiceovers for explainer videos, Synthesia has a vast library of voice options, accents, and languages. Choose the perfect voice to resonate with your target audience.

Personalization at your fingertips

Make each narration unique with customizable options. Adjust the pronunciation using SSML to make your AI-generated text-to-speech voice sound just right.

Authentic and expressive

How good can an AI-generated voiceover sound? AI voices are trained on human speech, so they sound natural and expressive, providing a human touch that engages listeners and keeps them captivated.

Global reach

Break language barriers effortlessly with multilingual AI audio files. Reach a wider audience without the hassle of hiring multilingual voice actors.

Maintain consistent quality

Create content with a consistent brand voice. Establish a recognizable human-like voice that resonates with your audience.

Enhance accessibility

Make your content more inclusive by providing AI audio versions for visually impaired individuals and those who prefer auditory consumption. Synthesia also automatically generates closed captions for all videos.

Voice cloning

Clone your own voice to provide consistent and instantly recognizable AI audio across your content. With voice cloning, you can maintain a cohesive brand identity and a familiar tone that resonates with your audience.

Make changes with ease

With Synthesia you can simply make changes to the text and update the video without the need to record a voiceover from scratch. This is a valuable feature to keep your content updated at all times without spending additional time or resources.

Create content with the best AI voices

Leverage our AI voice software to produce content that captivates viewers. Enrich your projects with high-quality, synthetic voices for enhanced clarity and realism.

Take advantage of world-class research

Our text-to-speech tools, powered by the latest developments in generative AI voice technology, transform written content into lifelike speech, setting a new standard for audio experiences.

All your AI voice questions answered

What is an ai voice.

An AI voice is a synthetic voice generated by artificial intelligence, designed to mimic human speech patterns and tones.

How to use AI voices?

AI voices can be utilized by accessing voice generation platforms, inputting desired text, and selecting the preferred voice type or accent. Once processed, the AI outputs the text in audio format, which can then be saved, shared, or integrated into applications.

What is an AI voice generator?

An AI voice generator is software that converts written text into humanlike voices. It can be customized to different speech styles, ages, genders, and accents and offers an easy translation to over 120 languages.

What is the best AI voice generator?

According to G2 reviews , the best AI voice generator on the market is Synthesia. The text-to-speech tool allows users to generate both ultra-realistic AI voices and videos with human-like AI avatars to narrate the voiceover. All without the use of video editing or recording equipment.

Are there any free AI voice generators?

Try Synthesia's free AI voice generator to test out its voice generation capabilities. Simply pick a voice, type in your script into the best free AI text-to-speech tool, and press 'Play' to hear the result.

Can I make an AI of my own voice?

To create your own AI voice using Synthesia, contact the support team to guide you through the voice creation process. Once you have submitted the needed consent and voice recordings, Synthesia will take 5-6 weeks to process it. Then, your own AI voice will appear in your Synthesia account, ready to be paired up with any avatar.

What is the AI voice generator everyone is using?

The best text-to-voice (AI text-to-speech tool) that everyone is using is Synthesia, according to G2 reviews . It combines the most advanced AI voices with state-of-the-art generative video capabilities that allow users to generate realistic videos with voiceovers in minutes.

How to use an AI voice generator?

• Type in your script into the text-to-speech tool or use an AI script generator
• Hit play to generate
• Download the voiceover

How to make an AI voiceover?

To make an AI text-to-speech voiceover, go to Synthesia's text-to-speech video creator and follow these steps:

• Sign up for Synthesia
• Create a new video by choosing a template
• Paste your video script and choose an AI voice to generate the text-to-speech voiceover
• Edit the video by adding an AI avatar, images, music, videos, and more
• Generate and download your video

What is the most realistic AI voice generator?

The best free realistic text-to-speech generator is Synthesia, as voted by 1200+ reviewers on G2. Users can choose from 400+ AI voices with an incredibly diverse range of emotions, tones, accents, and languages and pair the voice with an AI avatar for an even more lifelike performance.

Ready to start creating video content with realistic AI voices?

Create an account and get started using Synthesia with full access to all 140+ avatars and 130+ languages.

The best AI voice generators compared

What is the best AI text-to-speech software? Let's compare the 13 best paid & free AI voice generators on the market.

Free English Text to Speech & AI Voice Generator

How to create english text to speech, find a voice, select the model, enter text & adjust settings, generate audio.

Best Text to Speech Quality

Contextual awareness, natural pauses, library of hq voices, customizable accents, tone and emotional control, english ai voice applications, storytelling and audiobooks, marketing and branding, educational content, voice assistants and ivr, hear from our text to speech users.

The voices are really amazing and very natural sounding. Even the voices for other languages are impressive. This allows us to do things with our educational content that would not have been possible in the past.

It's amazing to see that text to speech became that good. Write your text, select a voice and receive stunning and near-perfect results! Regenerating results will also give you different results (depending on the settings). The service supports 30+ languages, including Dutch (which is very rare). ElevenLabs has proved that it isn't impossible to have near-perfect text-to-speech 'Dutch'...

We use the tool daily for our content creation. Cloning our voices was incredibly simple. It's an easy-to-navigate platform that delivers exceptionally high quality. Voice cloning is just a matter of uploading an audio file, and you're ready to use the voice. We also build apps where we utilize the API from ElevenLabs; the API is very simple for developers to use. So, if you need a...

As an author I have written numerous books but have been limited by my inability to write them in other languages period now that I have found 11 labs, it has allowed me to create my own voice so that when writing them in different languages it's not someone else's voice but my own. That's certainly lends a level of authenticity that no other narrator can provide me.

ElevenLabs came to my notice from some Youtube videos that complained how this app was used to clone the US presidents voice. Apparently the app did its job very well. And that is the best thing about ElevenLabs. It does its job well. Converting text to speech is done very accurately. If you choose one of the 100s of voices available in the app, the quality of the output is superior to all...

Absolutely loving ElevenLabs for their spot-on voice generations! 🎉 Their pronunciation of Bahasa Indonesia is just fantastic - so natural and precise. It's been a game-changer for making tech and communication feel more authentic and easy. Big thumbs up! 👍

I have found ElevenLabs extremely useful in helping me create an audio book utilizing a clone of my own voice. The clone was super easy to create using audio clips from a previous audio book I recorded. And, I feel as though my cloned voice is pretty similar to my own. Using ElevenLabs has been a lot easier than sitting in front of a boom mic for hours on end. Bravo for a great AI product!

The variety of voices and the realness that expresses everything that is asked of it

I like that ElevenLabs uses cutting-edge AI and deep learning to create incredibly natural-sounding speech synthesis and text-to-speech. The voices generated are lifelike and emotive.

English AI Voice Generator

Engaging and relatable, versatile applications, high-quality audio, easy to use, cost-effective, consistency, frequently asked questions, what sets elevenlabs' english text to speech (tts) apart from conventional tts services.

Eleven Multilingual offers more than a basic text-to-speech service. It uses advanced AI and deep learning to create clear, emotionally engaging speech. It doesn't just translate words; it also captures the subtle aspects of language, like local accents and cultural context, making your content more relatable to a wide range of audiences.

Can I clone my voice to speak in multiple languages?

Yes! Our Professional Voice Cloning technology seamlessly integrates with Eleven Multilingual. Once you've created a digital replica of your voice, that voice can articulate content in all languages supported by our model. The beauty of this integration is that your voice retains its unique characteristics and accent, effectively letting you 'speak' languages you might not know, all while sounding just like you.

Can the English handle different regional accents?

Yes, our TTS technology can adapt to various regional English accents, providing flexibility for your content.

How much does it cost to use ElevenLabs' English text to speech?

Our pricing is based on the number of characters you generate. You can generate 10,000 characters for free every month. Find out more in our pricing page.

What is English text to speech?

Text to speech (TTS) is a technology that converts text into spoken audio. It's used to create voiceovers for a variety of content, including videos, audiobooks, and podcasts.

What is the best English text to speech online?

ElevenLabs offers the best English text to speech (TTS) online. Our AI-powered technology ensures clear, high-quality audio that's engaging and relatable. We are rated 4.8/5 on G2 and have millions of happy customers.

Create Conversational Human-like Agents using Voice AI

AI Voice Generator: Most Realistic Text to Speech AI

Generate ai voices, indistinguishable from humans.

Ultra realistic Text to Speech(TTS) voice. Leading AI Voice Generator. Free Unlimited downloads. Most Fluent & Conversational AI voices

Trusted by individuals and teams of all sizes

Our Products - A New Way to Generate Speech

AI Text to Speech

Realistic AI Voice Models for Generating Expressive Speech

AI Voice Cloning

Voice Cloning that Encapsulates Every Accent and Dialect

Voice Generation API

Real Time Voice Cloning and Voice Generation API

Enhance Your Projects with Ultra-Realistic AI Voices

Create engaging voice content with unique AI Voices perfect for your audience

• AI Voiceovers for Videos
• Audio Publishing
• Audio Storytelling
• Conversational AI
• Custom Voice Creation
• IVR Systems
• Translation & Dubbing
• Voice Accessibility

Power your videos with clear, consistent, and professional voiceovers. Perfect for marketing, explainer, product demos, and YouTube videos.

Embed SEO-friendly audio widgets on your websites for accessibility and engagement. Publish your newspaper, article, or blog content in audio format.

Narrate your audiobooks with ultra-realistic voices seamlessly and effectively. Shorten your production time by generating audio in seconds.

Voice your conversational assistants with ultra-realistic, humanlike voices. Create scalable, delightful customer experiences.

Modify your existing voiceovers, or generate a unique custom voice that perfectly fits your brand’s personality for a connected customer experience.

Curate engaging e-learning material with voices capable of pronouncing terminologies and acronyms. Update your training material effortlessly by regenerating audio.

Create and customize your own podcast with unique voices or clone your own voice to scale your podcast production.

Streamline your game’s pre-production with ultra-realistic AI voices. The perfect placeholder for voice acting for your Pre-Vis and Pitch-Vis needs.

Automate your IVR system’s voice responses with AI voices. Revolutionize your customer experience by delivering seamless, personalized interactions every time.

Localize your video and voice content in seconds. Automatically dub your existing audio into other languages. Instantly make your videos accessible to a global audience.

Integrate human-like voices in your assistive voice devices and applications. Provide ultra-realistic voice experiences to enhance accessibility.

Make use of PlayHT’s Voice Generation API to power your conversational chatbot, live streams, and games. Reduce development time and costs.

Generative Voice AI that Captures Any Voice, Language or Accent

Contextually Aware, Emotional and Expressive Text to Speech Models Built with Advanced Voice AI Powered by Research

Generate Conversational, Long-form or Short-form Voice Content With Consistent Quality and Performances.

Secure and Private Voice Generations with Full Commercial and Copyrights

Text to Speech AI Voices

Choose from an expansive library of 800+ natural-sounding AI Voices, coupled with humanlike intonation. Unlock a multilingual experience with 142 languages and accents, enhanced by our cutting-edge Machine Learning technology

Conversational Voices

Perfect for entertainment videos, podcasts and audiobooks

Narrative Voices

Ideal for audiobooks, explainer videos and documentary videos

Explainer Voices

Ideal for entertainment videos, explainer videos, podcasts and audiobooks

Children Voices

Perfect for audiobooks, explainer videos and e-learning

Local Accents

Localize your entertainment videos, adverts and audiobooks

Ideal for gaming, creative videos and ads

Character Voices

Perfect for gaming, creative videos and ads

Training Voices

Suitable for training videos, L&D and E-learning

AI Voices in 100+ Languages

Our extensive AI Voice library spans across all major languages and accents in the world

Multi-Lingual Speech Synthesis

Preserve a speaker’s voice and native accent while translating and dubbing across languages with our Cross-Language Voice Cloning and Multilingual Speech Synthesis

Create any voice, transfer speaking styles and use it to generate speech using our state-of-the-art Voice Cloning feature.

Powerful and Feature-Rich, Online Text-to-Voice Studio

Type, paste or import text and instantly turn it into audio with our online Text to Speech editor. Enhance the audio with speech styles, pronunciations and SSML tags.

907 AI Voices

Choose from a growing library of 907 natural-sounding Text to Speech voices across 142 languages and accents.

Speech Styles

Use expressive emotional speaking styles to make the voices sound more natural and engaging.

Multi-Voice Feature

Create conversations in your audio projects by using different voices in the same audio file.

Custom Pronunciations

Define how specific words are pronounced. Save and re-use those pronunciations when synthesizing speech.

Voice Inflections

Fine-tune the rate, pitch, emphasis and add pauses to create a more suitable voice tone

Preview Mode

Listen and preview a single paragraph or full text before converting it to speech.

Learn How to Use Our AI Voice Technology Effectively

Ethical AI & Safety

We are dedicated to ensuring our Voice AI is used responsibly and safely.

Learn About our AI Voice Generation & Text-to-Speech Technology

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⚡️ Introducing Rapid Voice Cloning

Voice Cloning

Record or Upload your voice data to create your AI Voice.

Speech to Speech

Realtime speech-to-speech voice conversion.

Build your synthetic voices in 60+ languages.

Neural Audio Editing

Audio Editing made simple with synthetic voices

Programmatically build content with your synthetic voices.

Start Building Your Voice

Realtime Audio Deepfake Detector

Watermarker

AI Watermarker to Protect your IP

Video Conferencing

Detect malicious actors in Video Conferencing

Deepfake Incident Reports

In-depth incident reports for the latest deepfakes

Schedule a Demo with our team

Conversational AI Bots

Real-time Custom Voices for your AI Assistant

Realtime text-to-speech to bring your game characters to life

Entertainment

Learn how our custom voice cloning solution is used in TV and Movies.

Advertisement

Create dynamic ads with familiar voices.

Call Centers

Increase call volume, and augment your agents with synthetic voices.

Create AI Audiobooks with Resemble AI’s Audiobook Narrator Voices

Our ethical statement and guidelines for usage.

Case Studies and Development Thoughts from our team.

Custom AI Voices in your apps 

Resemble ai delivers a cutting-edge generative ai voices and robust deepfake audio detection, engineered for enterprises prioritizing advanced security and safety., our approach, the generative voice ai platform designed for scale and security.

Whether you want to deploy through the cloud or on-prem, Resemble AI makes it easy to create and deploy thousands of AI Voices.

Create hyper-realistic AI Voices

Our professional-grade voice clones are virtually indistinguishable from the original source. Perfect for videos, audiobooks, podcasts, video games, and more.

Deploy the way you want

We recognize that some users prefer to retain control over their data and infrastructure. Therefore, we offer the option to self-host our powerful voice AI platform. By self-hosting Resemble AI, you gain numerous advantages, including enhanced security, greater customization options, and seamless integration with your existing infrastructure.

Learn more about on-prem

Watermarking & Detect

Safeguard your digital ecosystem with Resemble Detect, our state-of-the-art neural model meticulously designed for the real-time detection of deepfake audio. Confidently secure your communications, protect your brand, and maintain the trust of your audience in an increasingly complex digital landscape.

Rapid Voice Cloning

Generate natural-sounding AI voices with just 10 seconds of data. Our process is designed for simplicity: simply provide an audio sample of the target voice, and we handle the rest.

Speech-to-Speech

Control every nuance of your AI voice by using your own voice as input. Perfect for films, games, and voice overs.

Multilingual Support out of the box

Easily switch between our extensive range of 149+ supported languages using the cloned voice, ensuring clear and cohesive communication.

200ms time to first sound

Our real-time websockets API delivers time to first sound as low as 200ms, so you can build truly conversational experiences.

Hear how Resemble helps

Elevate your customer service and conversational AI agents with Resemble AI's cutting-edge voice cloning technology. Our custom AI voices offer a seamless, natural interaction that enhances user engagement and satisfaction. With Resemble AI, create a unique voice identity for your brand, ensuring a consistent and personalized customer experience that stands out in the digital landscape.

Elevate your gaming narratives with Resemble AI's advanced voice technology. Perfect for PC, console, or mobile games, our AI effortlessly animates characters, enhancing everything from heroes to NPCs with vibrant voices. Benefit from our real-time API for scalable, low-latency dialogue, ensuring fluid integration and superior audio quality.

Revolutionize your entertainment creations with Resemble AI's advanced voice technology. Clone any voice for films, TV, and more, crafting realistic synthetic voices that capture every speech nuance. Our real-time conversion and instant language dubbing broaden your reach globally without losing character authenticity. Suitable for documentaries, animations, or blockbusters, Resemble AI enables you to perfect every voice, transforming the audio experience. Step into the future of entertainment with Resemble AI.

Elevate your security with Resemble AI's voice technology. Our suite includes real-time voice cloning for cyber threat simulations, Resemble Detect for deepfake audio detection, and AI Watermarker for invisible audio watermarking. Protect against sophisticated scams and unauthorized content use, ensuring the integrity of your digital assets. Resemble AI delivers crucial tools for combating modern cyber threats and safeguarding intellectual property.

Deploy on your own infrastructure

Get started with Resemble’s voice AI capabilities in minutes using our convenient Python package. Perfect for developers who want to quickly experiment or incorporate voice features into existing applications.

Easy Installation

Install the Resemble package directly from your Python environment using familiar pip commands. No complex setup or additional tools required.

Secure and Self-Contained

The resemble-local package runs entirely on your own machines, keeping your voice data and processing fully isolated. No internet connection or external dependencies needed.

Flexible Licensing

Choose the subscription plan that fits your needs, from individual seats to site-wide licenses. Upgrade anytime as your usage grows, without any change to your code.

Flexible API made for Developers

Rapidly build production-ready integrations with modern tools. Use Resemble’s API to fetch existing content, create new clips and even build AI voices on the fly. Try our low-latency API.

Unlock the power of cutting-edge voice AI with Resemble AI’s Python SDK, streamlining content creation for developers.

AI Voice Generator with Javascript. You’re one “yarn add” away from Generative AI Voices.

Unity Plugin to provide Realistic text-to-speech and speech-to-speech in Games.

For the most custom integration, our REST API makes it simple to get started.

GPT Integration

Resemble’s AI Voice Generator paired with Open AI’s GPT-4 model for powerful conversational apps.

Integrate Custom AI Voices for IVR and Contact Center through Twilio.

Custom Voice Bot with Dialogflow. Create unique brand experiences with AI Voices.

Resemblyzer

Open source speaker diarization, fake speech detection and speaker similarity.

Experience Generative Voice AI beyond text-to-speech

Add an infinite amount of emotions to your voice without any new data. Happy, sad, angry, all preloaded, out of the box.

Transform your voice into the target voice with real-time realistic speech-to-speech. Granular control over every inflection and intonation.

Convert your voice into any language without providing any data. Reach a global audience with support in up to 100 languages. 

Resemble Fill

Edit audio by typing..

Take your real voice recordings and sprinkle in synthetic content for a seamless experience. Replace, add, or remove any speech seamlessly.

Resemble AI in the News

Senate hearing with deepfake experts tackles elections and sexual abuse, resemble ai launches tool to make ai voice clones in a minute, audio deepfakes emerge as weapon of choice in election disinformation,  the most ethical ai voice generator.

Confronting Deepfake Audio from the Music Industry to Podcasts, from AI-generated Songs to Fraudulent Public Statements. Arm your applications with Real-Time Deepfake Detection and unparalleled IP protection.

VOICE CLONING

Craft realistic speech in any voice or language with our AI-driven, consent-based text-to-speech technology, featuring emotional depth for unmatched authenticity.

DEEPFAKE DETECTOR

Utilize our Real-time Deepfake Detector model to distinguish AI-generated content, enabling Enterprises to enhance detection of deepfakes with fine-tuned precision.

AI WATERMARKER

Safeguard your intellectual property with Resemble’s AI Watermarker, designed to identify if your audio data has been utilized in training Generative AI models, ensuring your content’s integrity.

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AI Voice Generator

Cut costs, not quality - craft studio grade voiceovers with our ai voice generator in minutes.

Our AI Voice Generator is powered by sophisticated Artificial Intelligence algorithms trained on professional voice actors. This is why we are able to offer AI-generated voices so realistic you’ll have to pinch yourself.

No signup, no credit card required

Trusted by hundreds of leading brands

Some ai voices sound good — the synthesys difference is that ours sound human.

Forget about expensive equipment and logistics hassles. Our AI avatars will present in your videos at a fraction of the cost.

Less time spent hiring artists means more time for building your brand

Forget paying for studio time and vetting voice actors. Synthesys free AI voice generator gives you the world-class quality of a professional recording studio in minutes.

Wide Range of Accents and Languages

We offer more than 370 voices in 140+ different languages, both male and female . This way, you can be sure that you will find a voice that will fit your brand and communicate globally.

Advanced Multilingual Voice Cloning

Replicate voices in multiple languages with our cutting-edge voice cloning feature . Perfect for creating consistent branding across different markets and languages.

Easy Text-to-Speech API Integration

Integrate lifelike speech capabilities into your applications effortlessly with our robust Text-to-Speech API – enabling seamless, scalable voice solutions across platforms.

Powerful. Flexible. Ridiculously easy to use

Turning any text into the kind of elite natural-sounding speech your brand deserves is as simple as clicking a button with Synthesys AI voice generator.

But don’t just take our word for it. Why not try it out yourself?

00:00 / 00:00

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No matter what you need an ai voice for, synthesys ai voice generator can handle it.

Don’t settle for anything less than complete customisability

At Synthesys, we like to go above and beyond. That’s why we built our AI text-to-speech tool to be as flexible as your brand deserves.

Emphasize specific sentences to evoke a wide range of real emotions, like passionate, joyful, confident, angry, and more

Use Preview mode to get an instant insight into how your voiceover will sound

Control the narrative with Speed & Pitch and add life to the end result with stresses on particular syllables

Add in pauses where appropriate to give your voiceover a truly human feel

The future of AI voices is here, and it looks pretty good

Casting aside cookie-cutter AI voice generators with robotic intonations, Synthesys brings you voices that are remarkably natural, persuasive, and tailored to foster genuine connections with your audience.

Still in doubt? Explore the examples below to experience it firsthand

The modern world is more connected than ever, and being understood has never been more important

That's why Synthesys AI Voice Generator offers hyper-realistic synthetic AI-generated voices in more than 140 languages.

Australian English

British english, don’t take our word for it.

Check out what our users have to say about working with Synthesys AI Studio

I never thought it was possible to create such high-quality videos without any prior experience in animation. Thanks to Synthesys, I was able to make amazing videos with ai-avatars and voiceovers in just a few minutes! It's the only AI content suite I'll ever need.

Paul Mitchel

As a content creator, I'm always looking for ways to improve my workflow and the quality of my content. Synthesys has been a game-changer for me. With just a few clicks, I can create amazing videos with voiceovers and ai-avatars. It's made my life so much easier and my content so much better.

I was skeptical at first, but after using Synthesys for a few weeks, I'm a true believer. The AI technology is incredible - it can turn images and voiceovers into amazing videos that look like they were created by a professional.

Cameron Williamson

Commercial Director

What you can create with Synthesys's software is nothing short of incredible! This is State Of The Art. There's nothing else that even comes close, as far as I know, and certainly not for the relatively small investment. Even better, the program's creators continue updating and upgrading the product, as the technology expands, at no extra cost! Try it, and be amazed at the possibilities!

Phillip Wilkinson

My experience with Synthesys AI Studio is very positive! They create Astounding products that blows my mind, in fact you might say they do the impossible, They are the very, very good at what they do! I think I have nearly all of their products to date and intend to purchase more!

From the start Synthesys has been delivering a quality product. The quality of the "actors" and the voices produced has been top-notch. And the updates and upgrades have been phenomenal. I am more than happy to continue using this platform.

Need Help with Our AI Voice Generator?

If you can't find your answer here, email [email protected] for additional support.

What is an AI Voice Generator?

An AI voice generator is a state-of-the-art technology that uses artificial intelligence (AI) to create voice recordings or speech that sounds human. These systems synthesize natural-sounding speech by analyzing large datasets of human voices through deep learning algorithms. AI voice generators can be used for various tasks, such as creating text-to-speech conversion solutions and voiceovers for movies and screen captures. They make producing high-quality audio content straightforward since they can imitate various accents, languages, and speech patterns. With its realistic and adaptable AI-generated voices, this technology revolutionizes sectors like accessibility services, media production, and content creation.

What is an AI Voice?

AI voice refers to a synthetic or computer-generated voice created using sophisticated algorithms and machine learning models. The AI voices' emulation of human voices makes speaking convincingly and naturally possible. Text-to-speech software, voice assistants, virtual CSRs, and content production are just a few of the industries they find use in. AI voices are flexible tools for information delivery, improving user experiences, and automating spoken communication chores since they can be tailored for various accents, languages, and tones.

How Do AI Voice Generators Work?

AI voice synthesizers use neural networks and deep learning techniques to mimic human speech. At first, these AI voice generators are trained on large datasets of human voice recordings to acquire phonemes, intonations, and speech patterns. After training, these models can anticipate the best phonetic and prosodic components to turn text input into synthetic voice. Pitch, tone, and tempo can all be changed to produce a variety of voices. Certain models (e.g., Synthesys) produce natural speech by combining phoneme sequences with text. With its natural-sounding synthetic voice, the output can be utilized for many purposes, such as voiceovers and text-to-speech. Here's a detailed rundown of how they function: Text processing — Written text is fed into the system at the start. This content may be presented in paragraphs, phrases, or even longer papers. Text analysis — The AI voice generator analyzes the text to determine its linguistic structure, including word order, punctuation, and grammar conventions. Sentence boundaries, parts of speech, and other linguistic components are also be identified at this step. Phonetic conversion — The AI then determines the text's phonetic representation. This entails dissecting words into their constituent phonemes, a language's smallest sound units. Voice selection — Selecting from various voices, dialects, and accents is the next option for the user, depending on the particular AI voice generator. The AI model that generates the voice can significantly impact the output's naturalness and quality. Natural Language Processing — The AI uses natural language processing techniques to comprehend semantics and context. This aids in choosing the proper tempo, stress, and intonation—all of which are essential for the generated speech to sound realistic. Voice synthesis — Combining phonetic components, prosody (intonation, rhythm, and pitch), and language context allows the AI to produce speech. The audio waveform is generated by deep learning models such as Transformer-based architectures, Convolutional Neural Networks (CNNs), and Recurrent Neural Networks (RNNs). Audio rendering — The audio waveform is then created from the synthesized speech. The digital audio data that can be played on speakers or headphones is represented by this waveform. Output — Delivering the created audio to the user is the last stage. This could take the shape of an audio file that can be downloaded, audio that can be streamed, or an application or service integration. Customization — customization is a key feature of modern AI voice generators. Users now have the ability to tweak elements like speech speed, pauses, pitch, and tone to better suit their preferences. These customization options have opened up new possibilities for users to personalize their AI-generated voices. Integration — integration is another exciting aspect of AI voice generators. These systems can seamlessly integrate into a range of applications, from virtual assistants and accessibility tools to e-learning platforms and content creation software. This integration capability makes AI-generated voices a valuable addition to various fields, enhancing the user experience in each of these areas. Over the past few years, AI voice generators have made significant advancements, resulting in remarkably natural-sounding speech. They have found their footing in diverse sectors, including education, entertainment, accessibility, and customer service. This progress has made synthetic speech that closely resembles human speech more accessible and adaptable than ever before.

How Long Does It Take To Synthesize Text to Speech?

Text complexity, speech synthesis engine performance, and text length are some variables that affect how long it takes to synthesize text into speech. Modern AI-based text-to-speech systems can produce speech for short to medium-length texts almost instantly, usually in a few seconds. However, the synthesis process may take a little longer—typically a few seconds to a minute—for longer and more complicated texts. Advances in AI technology have significantly shortened the time required for text-to-speech conversion, making it a quick and efficient process for various applications, including voice assistants and content production.

How is Voice Generation Time Calculated?

The text's intricacy, the AI voice model's quality, and the hardware's processing capacity affect how long it takes to generate an audio file. Since it's usually monitored in real-time, processing a minute's worth of voice creation takes roughly a minute. Dedicated gear and speedier CPUs, though, can expedite the procedure. Furthermore, cloud-based AI services could provide different processing speeds depending on server traffic. Longer texts and more complex voice models will also lengthen the generation time. In conclusion, real-time processing is the baseline, while text complexity, software, and hardware affect generation time.

Why Should I Use An AI Voice Generator Instead Of Hiring Voice Artists?

AI voice generators provide economical and practical options for content creation and voiceovers. They save time and money by offering instant access to various voices, languages, and accents. AI speech generators can produce content in minutes instead of paying professional voice actors; therefore, projects can be completed quickly. They also provide possibilities for pitch, tone, and pause adjustments, as well as speed, pronunciation, and emotions, resulting in adaptable and realistic-sounding results. Professional voice actors provide a personal touch, but AI voice generators are a realistic option for content creators seeking quality and ease, especially when working on tight deadlines or budgets.

Why Choose Synthesys AI Studio?

Synthesys AI Studio is a great choice for businesses and creators who want high-quality AI voices for their projects. It's fairly easy to use and comes with one of the biggest selections of voices to choose from (300+ voices). There's also a special feature to tweak how the voices sound, including their speed and pitch. Finally, Synthesys AI Studio supports over 140 languages, making it useful for many people around the world. So, if you want to add amazing AI voices to your work, whether it's for professional voiceovers, videos, or audio, Synthesys AI Studio is a good option.

Can I Try Synthesys Studio AI Voice Generator For Free?

Unlike other platforms, you can use Synthesys Studio AI Voice Generator's free trial without registering for an account or adding your credit card information. Although free, there are certain restrictions, like a monthly cap on the amount of audio rendered in minutes and an artificial intelligence script assistant with incredibly realistic voices. If the free trial does not meet your needs completely, you can always select from other plans with more perks (Premium and Professional) to enhance your material further.

What Languages Does Synthesys AI Voice Generator Support?

Synthesys AI Voice Generator ensures accessibility for all and sundry with support for 140 languages, including English, Spanish, French, German, Italian, Portuguese, Dutch, Russian, Chinese (Simplified and Traditional), Japanese, Korean, Arabic, and many more. You can find all languages here . This broad language support makes it possible for users to produce voiceovers, speech synthesis, and material in various languages and accents, appealing to a wide range of users and making it a flexible tool for several uses.

Can I Use The Voices For Commercial Purposes?

The license agreements and terms of service for the particular AI voice generator software you are using will dictate whether or not you can use AI-generated voices for commercial purposes. The professional and premium plans from Synthesys include commercial licenses that let you utilize the voices for profit-making projects like marketing films, commercials, and other types of content. Nevertheless, there are restrictions on commercial use with our free edition and basic plan. It's vital to ensure you adhere to any usage restrictions by carefully reading the terms and licensing agreements of the plan you intend to use. You should subscribe to a premium or professional plan to take full advantage of our AI voice generator platform and obtain full commercial rights to use AI-generated voices in your commercial projects.

Is Synthesys The Best AI Voice Generator?

Synthesys is a well-known text-to-voice generator founded in 2020 and known for producing natural, human-sounding, high-quality voice synthesis. Since then, Synthesys has made huge leaps in producing ultra life-like sound voices and improving voice quality to the point where it's difficult to distinguish between a real human voice and an AI-generated voice. While Synthesys AI voice generator has received praise for its functionality and usability, it's essential to keep in mind that "the best" AI voice generator could differ based on personal preferences and demands. Synthesys is adaptable for a range of applications since it provides a variety of speech styles, languages, and accents. With a user-friendly interface and multiple customization settings, you can customize the AI voiceovers through Synthesys as needed. However, the "best" option will vary depending on desired features, voice needs, and affordability. It is best to investigate and contrast several AI voice generators to see which best suits your specific project's requirements for creating content.

How Do I Generate An AI Voice?

Registering on Synthesys' website is the first step towards creating a realistic AI voice. Once you're in, type or paste the text you want to convert to speech. Next, select your preferred AI-generated voice from various voices with varying accents, languages, and genders. Adjust the speech tempo, pitch, emotions, and tone to ensure the voice sounds perfect. For more information, check out our best tips guide inside the app and the training sections. nce the text has been entered and the actor of your choice has been picked, just press the play button at the bottom and wait for a little while for the platform's AI voice technology to produce an audio file with the voice of your choice. After it's finished, you can download the audio files in MP3 format. In addition, AI voice actors can also be used in languages other than those in which speakers are trained, so accented speech will carry across speakers. If you want French-accented English, for example, you can use French actors. You may utilize this AI-generated voice in any project that calls for realistic and natural-sounding speech, such as voiceovers, screen recordings, business presentations, onboarding videos, training videos, or films. In the event that you desire more than you presently have, just remember to review our terms and pricing plans.

Does Synthesys Work Offline?

Cloud-based services are Synthesys' primary mode of operation. Processing and producing high-quality synthetic sounds and speech from text inputs requires robust servers and internet access. Synthesys relies on an internet connection because users usually access it via a web interface or API.

Can I Use Synthesys For YouTube Videos?

Certainly! You can absolutely use Synthesys for your YouTube videos. Our AI tool offers text-to-speech capabilities, allowing you to transform written content into natural-sounding speech. It's a real game-changer for YouTube content creators looking to add narration, voiceovers, or subtitles to their videos without the need for a human voice actor. With Synthesys, you can effortlessly create engaging and informative YouTube content by generating top-notch synthetic voices in multiple languages and accents. It's a fast and cost-effective way to enhance your video material and reach a global audience. Just input your script, pick a voice style that suits your video, and let Synthesys work its magic, delivering authentic, professional-sounding AI speech.

Do You Have A Text-To-Speech API?

Yes, Synthesys offers a text-to-speech API (Application Programming Interface) for seamlessly integrating its text-to-speech (TTS) capabilities into your projects.

Ready to start generating AI voiceovers so realistic you won’t be able to tell the difference?

Voice   Generator

This web app allows you to generate voice audio from text - no login needed, and it's completely free! It uses your browser's built-in voice synthesis technology, and so the voices will differ depending on the browser that you're using. You can download the audio as a file, but note that the downloaded voices may be different to your browser's voices because they are downloaded from an external text-to-speech server. If you don't like the externally-downloaded voice, you can use a recording app on your device to record the "system" or "internal" sound while you're playing the generated voice audio.

Want more voices? You can download the generated audio and then use voicechanger.io to add effects to the voice. For example, you can make the voice sound more robotic, or like a giant ogre, or an evil demon. You can even use it to reverse the generated audio, randomly distort the speed of the voice throughout the audio, add a scary ghost effect, or add an "anonymous hacker" effect to it.

Note: If the list of available text-to-speech voices is small, or all the voices sound the same, then you may need to install text-to-speech voices on your device. Many operating systems (including some versions of Android, for example) only come with one voice by default, and the others need to be downloaded in your device's settings. If you don't know how to install more voices, and you can't find a tutorial online, you can try downloading the audio with the download button instead. As mentioned above, the downloaded audio uses external voices which may be different to your device's local ones.

You're free to use the generated voices for any purpose - no attribution needed. You could use this website as a free voice over generator for narrating your videos in cases where don't want to use your real voice. You can also adjust the pitch of the voice to make it sound younger/older, and you can even adjust the rate/speed of the generated speech, so you can create a fast-talking high-pitched chipmunk voice if you want to.

Note: If you have offline-compatible voices installed on your device (check your system Text-To-Speech settings), then this web app works offline! Find the "add to homescreen" or "install" button in your browser to add a shortcut to this app in your home screen. And note that if you don't have an internet connection, or if for some reason the voice audio download isn't working for you, you can also use a recording app that records your devices "internal" or "system" sound.

Got some feedback? You can share it with me here .

If you like this project check out these: AI Chat , AI Anime Generator , AI Image Generator , and AI Story Generator .

Convert text into speech.

Here is the list of all the voices that you can use to generate speech

Wideo » Blog » Video Automation » 7 Best Text-to-Speech Tools for 2024

7 Best Text-to-Speech Tools for 2024

by María José Azar | Personalized Video , Video Automation , Video Marketing

Text-to-speech (TTS) technology has come a long way in recent years, offering many benefits for businesses and individuals. With TTS, you can easily convert written text into spoken audio, making your content more accessible and engaging for a broader audience.

Incorporating audio elements into your content creation can significantly enhance user experience. Whether creating e-learning materials, marketing presentations, audiobooks, or YouTube videos, TTS can help you save time, improve engagement, and reach a wider audience. In this blog post, we’ll explore 7 of the best text-to-speech tools available in 2024 , highlighting their unique features and benefits. 

7 of the Best TTS Tools of 2024: Enhance Your Content with AI-Powered Voices.

1. google cloud text-to-speech.

Let’s start with something we all know: Google. So, Google Text-to-Speech is, of course, a powerful tool developed by Google that converts text into lifelike speech using deep learning technologies. It offers a wide range of great features including:

• Multilingual support: It supports over 130 different voices in 40 languages
• Neural text-to-speech: Google Cloud TTS uses advanced neural networks to create natural-sounding voices. And I can promise you, they’re indistinguishable from human speech.
• SSML support: Google Cloud Text-to-Speech supports SSML (Speech Synthesis Markup Language), allowing users to fine-tune pronunciation, pauses, and emphasis.
• Custom voice: You can train a custom voice model using your own audio recordings.
• Customizable voices: Flexible customization options for pitch, speaking rate, and volume
• Integration with other Google Cloud platform products

This is the perfect option if you want to create text-to-speech audios effortlessly and is also an excellent choice for individuals and businesses that need to create high-quality voice overs for their videos and presentations.

3. TTSMaker Text-to-Speech

TTSMaker is a free online TTS tool that offers a very simple interface and a variety of voices and languages. It allows you to convert text into speech quickly, making it ideal for tasks requiring a bulk conversion. But wait, it also offers interesting features like adding music to the background of your audio and more!

• Simple interface: TTSMaker allows you to convert your text into speech easily and quickly.
• Variety of voices: It offers more than 130 different voices and a lot of languages too.
• Downloadable audio: You can download the audio file in various formats including MP3, WAV, and OGG.
• Integration with other tools: TTSMaker can be integrated with other tools and websites, making it versatile for various apps. 

This is a great choice for users who need a simple and free TTS tool for quick text-to-speech conversion.

4. Text-to-Voice Online

Text to Voice Online is a free online TTS tool that offers a variety of features, including natural-sounding voices, adjustable playback speed, and support for multiple file formats. Oh, and it has something that other TTS does not offer, and that is that you can choose different kinds of emotions like angry, sad, cheerful, happy, and more. 

• Natural voices: It uses advanced text-to-speech technology to generate natural-sounding voices that are easy to listen to. It offers a wide range of languages and also you can choose between many different voices. 
• Emotion Voices: An interesting feature that Text-to-Voice Online offers is that you can choose the emotion that the voice is going to have, like a sad voice, a happy voice, and more. Unfortunately, this is a premium feature. 
• Adjustable playback speed: You can adjust the playback speed of the audio to suit your preferences or listening needs.

This tool is a classic option if you need a quick text-to-voice conversion, and it supports multiple file formats too. It has many great features if you are a premium user. 

You may also be interested in Best AI Avatar Generators to Try in 2024

5. Natural Readers Online

Natural Readers Online is a popular TTS tool that caters to various use cases, from educational purposes to content creation. It offers a variety of features designed to enhance your experience and improve workflow efficiency.

• Extensive library: This tool offers a selection of voices in different languages, including both human and synthetic voices.
• Premium and free trial: Natural Readers has a free version with many features, and also offers a premium one where you can discover a lot of new and different features such as different types of voices that the free version doesn’t have.
• Learning tools: The tool includes integrated learning tools, such as text highlighting and synchronization with text, making it ideal for educational purposes.

Natural Readers is a great TTS solution that caters to a wide range of users. Its extensive voice library, customizable settings, and support for multiple platforms make it a versatile and user-friendly tool

6. ElevenLabs

Eleven Labs is a company specializing in artificial intelligence (AI) powered speech synthesis and text-to-speech (TTS) technology. They utilize deep learning to create high-quality, natural-sounding speech that can be used for various applications.

• Focus on Natural Speech: Their core strength lies in generating voices that closely resemble human speech. This makes their TTS ideal for creating voice overs for videos, audiobooks, or presentations where a realistic voice is crucial.
• Text-to-Speech and Beyond: They also provide features like voice cloning, speech-to-speech conversion (changing the style of speech), and dubbing in multiple languages.
• API and Developer Tools: They offer an API (application programming interface) that allows developers to integrate their AI voices into various applications and software. Very dynamic don’t you think?
• Ethical Considerations: Eleven Labs emphasizes responsible AI development and offers resources like an AI Speech Classifier and a Voice Cloning Guide to promote ethical use cases.

Overall, Eleven Labs is a strong contender in the TTS space, particularly for those seeking the most natural-sounding voices and advanced features.

You may also be interested in The Best AI Image Generators of 2024

7. VoiceMaker

VoiceMaker is a comprehensive text-to-speech (TTS) tool offering a variety of features and functionalities catering to a broad user base.

• Extensive Voice Library: VoiceMaker boasts a vast library of over 1000 realistic human-sounding voices across 130+ languages. This extensive selection allows you to find the perfect voice for your project, regardless of the desired tone, language, or accent.
• Customization Options: You can further customize various aspects, including pitch, speaking rate, volume, and even pauses (indicated by punctuation marks like question marks or commas). This level of control allows for fine-tuning the audio to achieve the desired effect.
• Commercial Use License: Unlike some free TTS tools with limitations on commercial use, VoiceMaker allows users to redistribute the generated audio files even after their subscription expires. This makes it a viable option for businesses and creators who need TTS capabilities for commercial projects.
• Free Voice Samples: VoiceMaker provides a user-friendly platform where you can explore and listen to samples of different voices before committing to a subscription.

VoiceMaker provides a powerful and feature-rich text-to-speech solution that caters to a broad audience. 

There are many TTS tools available and they all have kind of the same features like customization options, a vast library of voices, volume and speed features, many languages, and more. Here are some other tools that meet these characteristics that TTS offer:

• ReadSpeaker

So to choose one you can just try them all, because most of them have a free version or at least a free trial, and so you can find the one that fits your goals, your audience, and your content. 

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Computer Science > Computer Vision and Pattern Recognition

Title: faces that speak: jointly synthesising talking face and speech from text.

Abstract: The goal of this work is to simultaneously generate natural talking faces and speech outputs from text. We achieve this by integrating Talking Face Generation (TFG) and Text-to-Speech (TTS) systems into a unified framework. We address the main challenges of each task: (1) generating a range of head poses representative of real-world scenarios, and (2) ensuring voice consistency despite variations in facial motion for the same identity. To tackle these issues, we introduce a motion sampler based on conditional flow matching, which is capable of high-quality motion code generation in an efficient way. Moreover, we introduce a novel conditioning method for the TTS system, which utilises motion-removed features from the TFG model to yield uniform speech outputs. Our extensive experiments demonstrate that our method effectively creates natural-looking talking faces and speech that accurately match the input text. To our knowledge, this is the first effort to build a multimodal synthesis system that can generalise to unseen identities.

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Volume 34 Number 6

Text-To-Speech Synthesis in .NET

By Ilia Smirnov | June 2019

I often fly to Finland to see my mom. Every time the plane lands in Vantaa airport, I’m surprised at how few passengers head for the airport exit. The vast majority set off for connecting flights to destinations spanning all of Central and Eastern Europe. It’s no wonder, then, that when the plane begins its descent, there’s a barrage of announcements about connecting flights. “If your destination is Tallinn, look for gate 123,” “For flight XYZ to Saint Petersburg, proceed to gate 234,” and so on. Of course, flight attendants don’t typically speak a dozen languages, so they use English, which is not the native language of most passengers. Considering the quality of the public announcement (PA) systems on the airliners, plus engine noise, crying babies and other disturbances, how can any information be effectively conveyed?

Well, each seat is equipped with headphones. Many, if not all, long-distance planes have individual screens today (and local ones have at least different audio channels). What if a passenger could choose the language for announcements and an onboard computer system allowed flight attendants to create and send dynamic (that is, not pre-recorded) voice messages? The key challenge here is the dynamic nature of the messages. It’s easy to pre-record safety instructions, catering options and so on, because they’re rarely updated. But we need to create messages literally on the fly.

Fortunately, there’s a mature technology that can help: text-to-speech synthesis (TTS). We rarely notice such systems, but they’re ubiquitous: public announcements, prompts in call centers, navigation devices, games, smart devices and other applications are all examples where pre-recorded prompts aren’t sufficient or using a digitized waveform is proscribed due to memory limitations (a text read by a TTS engine is much smaller to store than a digitized waveform).

Computer-based speech synthesis is hardly new. Telecom companies invested in TTS to overcome the limitations of pre-recorded messages, and military researchers have experimented with voice prompts and alerts to simplify complex control interfaces. Portable synthesizers have likewise been developed for people with disabilities. For an idea of what such devices were capable of 25 years ago, listen to the track “Keep Talking” on the 1994 Pink Floyd album “The Division Bell,” where Stephen Hawking says his famous line: “All we need to do is to make sure we keep talking.”

TTS APIs are often provided along with their “opposite”—speech recognition. While you need both for effective human-computer interaction, this exploration is focused specifically on speech synthesis. I’ll use the Microsoft .NET TTS API to build a prototype of an airliner PA system. I’ll also look under the hood to understand the basics of the “unit selection” approach to TTS. And while I’ll be walking through the construction of a desktop application, the principles here apply directly to cloud-based solutions.

Roll Your Own Speech System

Before prototyping the in-flight announcement system, let’s explore the API with a simple program. Start Visual Studio and create a console application. Add a reference to System.Speech and implement the method in Figure 1 .

Figure 1 System.Speech.Synthesis Method

Now compile and run. Just a few lines of code and you’ve replicated the famous Hawking phrase.

When you were typing this code, IntelliSense opened a window with all the public methods and properties of the SpeechSynthesizer class. If you missed it, use “Control-Space” or the “dot” keyboard shortcut (or look at bit.ly/2PCWpat ). What’s interesting here?

First, you can set different output targets. It can be an audio file or a stream or even null. Second, you have both synchronous (as in the previous example) and asynchronous output. You can also adjust the volume and the rate of speech, pause and resume it, and receive events. You can also select voices. This feature is important here, because you’ll use it to generate output in different languages. But what voices are available? Let’s find out, using the code in Figure 2 .

Figure 2  Voice Info Code

On my machine with Windows 10 Home the resulting output from Figure 2 is:

There are only two English voices available, and what about other languages? Well, each voice takes some disk space, so they’re not installed by default. To add them, navigate to Start | Settings | Time & Language | Region & Language and click Add a language, making sure to select Speech in optional features. While Windows supports more than 100 languages, only about 50 support TTS. You can review the list of supported languages at bit.ly/2UNNvba .

After restarting your computer, a new language pack should be available. In my case, after adding Russian, I got a new voice installed:

Now you can return to the first program and add these two lines instead of the synthesizer.Speak call:

If you want to switch between languages, you can insert Select­Voice calls here and there. But a better way is to add some structure to speech. For that, let’s use the PromptBuilder class, as shown in Figure 3 .

Figure 3 The PromptBuilder Class

Notice that you have to call EndVoice, otherwise you’ll get a runtime error. Also, I used CultureInfo as another way to specify a language. PromptBuilder has lots of useful methods, but I want to draw your attention to AppendTextWithHint. Try this code:

Another way to structure input and specify how to read it is to use Speech Synthesis Markup Language (SSML), which is a cross-platform recommendation developed by the international Voice Browser Working Group ( w3.org/TR/speech-synthesis ). Microsoft TTS engines provide comprehensive support for SSML. This is how to use it:

Notice it employs a different call on the SpeechSynthesizer class.

Now you’re ready to work on the prototype. This time create a new Windows Presentation Foundation (WPF) project. Add a form and a couple of buttons for prompts in two different languages. Then add click handlers as shown in the XAML in Figure 4 .

Figure 4 The XAML Code

Obviously, this is just a tiny prototype. In real life, PopulateMessages will probably read from an external resource. For example, a flight attendant can generate a file with messages in multiple languages by using an application that calls a service like Bing Translator ( bing.com/translator ). The form will be much more sophisticated and dynamically generated based on available languages. There will be error handling and so on. But the point here is to illustrate the core functionality.

Deconstructing Speech

So far we’ve achieved our objective with a surprisingly small codebase. Let’s take an opportunity to look under the hood and better understand how TTS engines work.

There are many approaches to constructing a TTS system. Historically, researchers have tried to discover a set of pronunciation rules on which to build algorithms. If you’ve ever studied a foreign language, you’re familiar with rules like “Letter ‘c’ before ‘e,’ ‘i,’ ‘y’ is pronounced as ‘s’ as in ‘city,’ but before ‘a,’ ‘o,’ ’u’ as ‘k’ as in ‘cat.’” Alas, there are so many exceptions and special cases—like pronunciation changes in consecutive words—that constructing a comprehensive set of rules is difficult. Moreover, most such systems tend to produce a distinct “machine” voice—imagine a beginner in a foreign language pronouncing a word letter-by-letter.

For more naturally sounding speech, research has shifted toward systems based on large databases of recorded speech fragments, and these engines now dominate the market. Commonly known as concatenation unit selection TTS, these engines select speech samples (units) based on the input text and concatenate them into phrases. Usually, engines use two-stage processing closely resembling compilers: First, parse input into an internal list- or tree-like structure with phonetic transcription and additional metadata, and then synthesize sound based on this structure.

Because we’re dealing with natural languages, parsers are more sophisticated than for programming languages. So beyond tokenization (finding boundaries of sentences and words), parsers must correct typos, identify parts of speech, analyze punctuation, and decode abbreviations, contractions and special symbols. Parser output is typically split by phrases or sentences, and formed into collections describing words that group and carry metadata such as part of speech, pronunciation, stress and so on.

Parsers are responsible for resolving ambiguities in the input. For example, what is “Dr.”? Is it “doctor” as in “Dr. Smith,” or “drive” as in “Privet Drive?” And is “Dr.” a sentence because it starts with an uppercase letter and ends with a period? Is “project” a noun or a verb? This is important to know because the stress is on different syllables.

These questions are not always easy to answer and many TTS systems have separate parsers for specific domains: numerals, dates, abbreviations, acronyms, geographic names, special forms of text like URLs and so on. They’re also language- and region-specific. Luckily, such problems have been studied for a long time and we have well-developed frameworks and libraries to lean on.

The next step is generating pronunciation forms, such as tagging the tree with sound symbols (like transforming “school” to “s k uh l”). This is done by special grapheme-to-phoneme algorithms. For languages like Spanish, some relatively straightforward rules can be applied. But for others, like English, pronunciation differs significantly from the written form. Statistical methods are then employed along with databases for known words. After that, additional post-lexical processing is needed, because the pronunciation of words can change when combined in a sentence.

While parsers try to extract all possible information from the text, there’s something that’s so elusive that it’s not extractable: prosody or intonation. While speaking, we use prosody to emphasize certain words, to convey emotion, and to indicate affirmative sentences, commands and questions. But written text doesn’t have symbols to indicate prosody. Sure, punctuation offers some context: A comma means a slight pause, while a period means a longer one, and a question mark means you raise your intonation toward the end of a sentence. But if you’ve ever read your children a bedtime story, you know how far these rules are from real reading.

Moreover, two different people often read the same text differently (ask your children who is better at reading bedtime stories—you or your spouse). Because of this you cannot reliably use statistical methods since different experts will produce different labels for supervised learning. This problem is complex and, despite intensive research, far from being solved. The best programmers can do is use SSML, which has some tags for prosody.

Neural Networks in TTS

Statistical or machine learning methods have for years been applied in all stages of TTS processing. For example, Hidden Markov Models are used to create parsers producing the most likely parse, or to perform labeling for speech sample databases. Decision trees are used in unit selection or in grapheme-to-phoneme algorithms, while neural networks and deep learning have emerged at the bleeding edge of TTS research.

We can consider an audio sample as a time-series of waveform sampling. By creating an auto-regressive model, it’s possible to predict the next sample. As a result, the model generates speech-kind bubbling, like a baby learning to talk by imitating sounds. If we further condition this model on the audio transcript or the pre-processing output from an existing TTS system, we get a parameterized model of speech. The output of the model describes a spectrogram for a vocoder producing actual waveforms. Because this process doesn’t rely on a database with recorded samples, but is generative, the model has a small memory footprint and allows for adjustment of parameters.

Because the model is trained on natural speech, the output retains all of its characteristics, including breathing, stresses and intonation (so neural networks can potentially solve the prosody problem). It’s possible also to adjust the pitch, create a completely different voice and even imitate singing.

At the time of this writing, Microsoft is offering its preview version of a neural network TTS ( bit.ly/2PAYXWN ). It provides four voices with enhanced quality and near instantaneous performance.

Speech Generation

Now that we have the tree with metadata, we turn to speech generation. Original TTS systems tried to synthesize signals by combining sinusoids. Another interesting approach was constructing a system of differential equations describing the human vocal tract as several connected tubes of different diameters and lengths. Such solutions are very compact, but unfortunately sound quite mechanical. So, as with musical synthesizers, the focus gradually shifted to solutions based on samples, which require significant space, but essentially sound natural.

To build such a system, you have to have many hours of high-quality recordings of a professional actor reading specially constructed text. This text is split into units, labeled and stored into a database. Speech generation becomes a task of selecting proper units and gluing them together.

Because you’re not synthesizing speech, you can’t significantly adjust parameters in the runtime. If you need both male and female voices or must provide regional accents (say, Scottish or Irish), they have to be recorded separately. The text must be constructed to cover all possible sound units you’ll need. And the actors must read in a neutral tone to make concatenation easier.

Splitting and labeling are also non-trivial tasks. It used to be done manually, taking weeks of tedious work. Thankfully, machine learning is now being applied to this.

Unit size is probably the most important parameter for a TTS system. Obviously, by using whole sentences, we could make the most natural sounds even with correct prosody, but recording and storing that much data is impossible. Can we split it into words? Probably, but how long will it take for an actor to read an entire dictionary? And what database size limitations are we facing? On the other side, we cannot just record the alphabet—that’s sufficient only for a spelling bee contest. So usually units are selected as two three-letter groups. They’re not necessarily syllables, as groups spanning syllable borders can be glued together much better.

Now the last step. Having a database of speech units, we need to deal with concatenation. Alas, no matter how neutral the intonation was in the original recording, connecting units still requires adjustments to avoid jumps in volume, frequency and phase. This is done with digital signal processing (DSP). It can also be used to add some intonation to phrases, like raising or lowering the generated voice for assertions or questions.

Wrapping Up

In this article I covered only the .NET API. Other platforms provide similar functionality. MacOS has NSSpeechSynthesizer in Cocoa with comparable features, and most Linux distributions include the eSpeak engine. All of these APIs are accessible through native code, so you have to use C# or C++ or Swift. For cross-platform ecosystems like Python, there are some bridges like Pyttsx, but they usually have certain limitations.

Cloud vendors, on the other hand, target wide audiences, and offer services for most popular languages and platforms. While functionality is comparable across vendors, support for SSML tags can differ, so check documentation before choosing a solution.

Microsoft offers a Text-to-Speech service as part of Cognitive Services ( bit.ly/2XWorku ). It not only gives you 75 voices in 45 languages, but also allows you to create your own voices. For that, the service needs audio files with a corresponding transcript. You can write your text first then have someone read it, or take an existing recording and write its transcript. After uploading these datasets to Azure, a machine learning algorithm trains a model for your own unique “voice font.” A good step-by-step guide can be found at bit.ly/2VE8th4 .

A very convenient way to access Cognitive Speech Services is by using the Speech Software Development Kit ( bit.ly/2DDTh9I ). It supports both speech recognition and speech synthesis, and is available for all major desktop and mobile platforms and most popular languages. It’s well documented and there are numerous code samples on GitHub.

TTS continues to be a tremendous help to people with special needs. For example, check out linka.su, a Web site created by a talented programmer with cerebral paralysis to help people with speech and musculoskeletal disorders, autism, or those recovering from a stroke. Knowing from personal experience what limitations they’re facing, the author created a range of applications for people who can’t type on a regular keyboard, can only select one letter at a time, or just touch a picture on a tablet. Thanks to TTS, he literally gives a voice to those who do not have one. I wish that we all, as programmers, could be that useful to others.

Ilia Smirnov   has more than 20 years of experience developing enterprise applications on major platforms, primarily in Java and .NET. For the last decade, he has specialized in simulation of financial risks. He holds three master’s degrees, FRM and other professional certifications.

Thanks to the following Microsoft technical expert for reviewing this article: Sheng Zhao ( [email protected] ) Sheng Zhao is principal group software engineering with STCA Speech in Beijing

Discuss this article in the MSDN Magazine forum

Additional resources

SAM Software Automatic Mouth

What is sam.

Sam is a very small Text-To-Speech (TTS) program written in Javascript, that runs on most popular platforms. It is an adaption to Javascript of the speech software SAM (Software Automatic Mouth) for the Commodore C64 published in the year 1982 by Don't Ask Software (now SoftVoice, Inc.). It includes a Text-To-Phoneme converter called reciter and a Phoneme-To-Speech routine for the final output.

Currently compatible with Firefox, Chrome, Safari + iOS. The conversion was done by hand from the C source code by Sebastian Macke , and the refactored versions by Vidar Hokstad and 8BitPimp

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