Instantly convert text to speech that sounds human, never robotic. Choose from more than 300 natural AI voices in over 175 languages, fine-tune every detail of the delivery and add the narration straight to a finished video.
Key FeaturesHeyGen AI text-to-speech features
More than 300 realistic AI voices across 175+ languages
Browse a range of voices across different ages, accents and speaking styles until you find the right one for your content. Every option in HeyGen's AI voice generator maintains consistent voice quality across long scripts, so a ten-minute training module sounds as steady as a ten-second ad.
Control emotion, pace and pronunciation
Direct the read just 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 expression and emotion 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-synced narration in every language
Generated speech matches 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.
Use cases
Recording narration take after take takes hours. Paste your script, generate an AI voice-over that suits your channel and publish video content daily without ever setting up a microphone.
Re-recording voice-over for every policy update slows down L&D teams. Generate narration for each training video from an edited script, publish changes the same day and deploy updated modules to your LMS with one consistent voice.
Agencies quote hundreds of dollars for a two-minute voice-over. Write the ad copy, generate voice-overs in seconds and test five different voices against each other before the campaign launches.
Founders and product managers rarely have time to narrate walkthroughs. Describe 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, while keeping the same recognisable AI audio signature across every clip and platform.
Other tools stop at the audio file. HeyGen's AI video translator recreates your speech in more than 175 languages, clones the original voice and synchronises lip movements, turning a single video into a global content 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 in just minutes.
Type or paste your text into the editor. Long scripts are automatically split into scenes.
Browse more than 300 voices by language, accent, age and style, or use a clone of your own voice.
Adjust the emotion, pacing, pauses and pronunciation until the delivery matches your intent.
Render the finished video in HD or 4K, download the MP4 or publish it directly 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 paced delivery is what makes older TTS sound unnatural. HeyGen varies pacing and intonation based on context and lets you add pauses or emphasis manually, so even a 20-minute narration remains emotionally rich and natural-sounding from the first line to the last.
Paste your script into the text-to-video workflow, choose a voice and generate. The AI text-to-speech engine creates the narration while HeyGen builds matching scenes and synchronises captions, so you can export a finished MP4 rather than just an audio track.
Most TTS tools end at an audio download. HeyGen generates ultra-realistic speech inside a full video engine, adds a lip-synced on-screen presenter if you want one, and localizes the result into 175+ languages, so one script becomes finished, publishable video.
Enough to change how teams plan content. Advantive cut voice-over production from days to 2–3 hours, as documented in the Advantive customer story, and reduced overall content creation time by 50% after switching to HeyGen's AI-powered workflow.
For narration that ends up in video, yes. The free text-to-speech tier lets you test voices and generate videos before paying anything, and the free AI plan needs no credit card. Paid plans start at $24 per month and scale to custom enterprise agreements.
Yes. More than 85,000 business customers publish AI-generated narration on YouTube, in paid ads, and in client deliverables. Check your plan's terms to match the usage tier to your work before you publish commercially.
Yes. Record a short sample and HeyGen will build a clone that can generate natural narration from any script you type, with no voice changer needed. The clone retains your voice while letting you publish faster than any recording booth would allow, and it can speak languages you've never learnt.
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 remains customisable after generation, so the fix takes seconds and produces natural-sounding audio without a complete re-recording.
Yes. HeyGen exposes its text-to-speech capabilities and voice generation through APIs and SDKs, and LiveAvatar powers real-time voice agents with ultra-low latency responses, so products can ship narrated video or live spoken interaction 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 uses the file’s content to create natural-sounding AI narration and a finished video.
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