Convert text to natural-sounding speech in moments, without the robotic tone. Choose from more than 300 AI voices across over 175 languages, fine-tune every aspect of the delivery, and add the narration directly to a finished video.
Main featuresHeyGen AI text-to-speech features
More than 300 realistic AI voices across over 175 languages
Browse a range of voices spanning ages, accents and speaking styles until you find the right voice for your content. Every option in HeyGen's AI voice generator maintains consistent voice quality throughout long scripts, so a ten-minute training module sounds as steady as a ten-second advert.
Control emotion, pace and pronunciation
Direct the read as you would direct a voice actor. You have full creative control: customise the tone, speed, pauses and voice style in the text editor, and use emotional controls to adjust the expressive delivery of a single line without regenerating the entire script.
Clone Your Voice from a Short Sample
Record a short sample and use AI voice cloning to create a human-like voice that sounds like you. Your clone narrates every script you type, maintaining a consistent brand voice across hundreds of videos without studio time, retakes or re-recording when scripts change.
Text-to-Speech Designed for Video
Most text-to-speech tools hand you an audio file and leave the video to you. HeyGen generates the voice output inside the same video editor that builds the scenes, so spoken content, captions, and timing stay in sync from the first draft to the final export.
Lip-synchronised narration in every language
Generated speech maps to on-screen mouth movements through AI lip sync, so an AI avatar delivering your script looks filmed rather than dubbed. Switch the voice to Spanish, Hindi or Japanese, and the lips follow phoneme by phoneme across more than 175 languages and multiple dialects.
Applications
Recording narration take after take takes hours. Paste in your script, generate an AI voice-over that suits your channel, and publish video content every day without ever setting up a microphone.
Re-recording voiceover for every policy update stalls L&D teams. Generate narration for each training video from an edited script, push changes the same day, and deploy refreshed modules to your LMS in one voice.
Agencies quote hundreds of dollars for a two-minute voice-over. Write the advertising copy, generate voice-overs in seconds and compare five different voices before the campaign launches.
Founders and PMs rarely have time to narrate walkthroughs. Type what each screen does, generate a clear voice track for your product demo video, and update the audio whenever the interface changes.
Posting daily Reels, Shorts and TikToks means constant voice-over work. Turn captions and hooks into speech in seconds, whilst maintaining the same recognisable AI audio signature across every clip and platform.
Competing tools stop at the audio file. HeyGen's AI video translator regenerates your speech in 175+ languages, clones the original voice, and matches lip movement, turning one video into a global library.
How it worksHow AI text to speech works
HeyGen's speech generator takes you from a pasted script to a narrated video that's ready to share in four steps. Most first-time users finish within minutes.
Type or paste your text into the editor. Long scripts are split into scenes automatically.
Browse 300+ voices by language, accent, age, and style, or use a clone of your own voice.
Adjust emotion, pacing, pauses, and pronunciation until the read matches your intent.
Render the finished video in HD or 4K, download the MP4, or publish straight to your channels.
AI text to speech converts written text into spoken audio through a process called speech synthesis. Advanced AI text to speech models trained on human speech learn intonation, rhythm, and stress, producing lifelike speech for video narration, audiobooks, podcasts, and tools that improve accessibility.
No. Flat, evenly spaced delivery is what kills naturalness in older TTS. HeyGen varies pacing and intonation with context and lets you add pauses or emphasis by hand, so even a 20 minute narration stays emotionally rich, natural sounding speech from the first line to the last.
Paste your script into the text to video workflow, pick a voice, and generate. The AI text-to-speech engine produces the narration while HeyGen builds matching scenes and syncs captions, so you export a finished MP4 rather than a bare audio track.
Most TTS tools stop at an audio download. HeyGen generates highly realistic speech within a complete video engine, adds a lip-synchronised on-screen presenter if required, and localises the result into more than 175 languages, turning a single script into a finished video ready for publication.
Enough to change how teams plan content. Advantive cut voice-over production from days to 2-3 hours, a result documented in the Advantive customer story, and reduced overall content creation time by 50% after moving to HeyGen's AI-powered workflow.
For narration used in videos, yes. The free text-to-speech tier allows you to try voices and create videos without paying, and the Free AI plan does not require a credit card. Paid plans start at $24 per month, with bespoke Enterprise agreements also available.
Yes. More than 85,000 business customers publish AI-generated narration on YouTube, in paid adverts and in client deliverables. Check your plan's terms to ensure the usage tier suits your work before publishing commercially.
Yes. Record a short sample and HeyGen builds a clone that can generate natural narration from any script you type, no voice changer needed. The clone keeps your sound while you publish at a pace no recording booth allows, and it can speak languages you never learned.
Edit the script where the error occurs. Spell the word the way it should sound, add a pause around it, and regenerate the line. Every line stays customizable after generation, so the fix takes seconds and returns natural sounding audio without a full re-record.
Yes. HeyGen make their text-to-speech and voice-generation capabilities available through APIs and SDKs, whilst LiveAvatar powers real-time voice agents with ultra-low-latency responses, enabling products to offer narrated video or live spoken interactions to their own users.
Yes. Use your AI-generated narration in a faceless video created with footage, graphics, text and captions, so you can publish without filming yourself.
Yes. Upload your slides using PPT to video or your document using PDF to Video. HeyGen use the file’s content to create natural AI narration and a finished video.
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