VIDEOByteDance · from 20 credits / sec

Same speaker, new words

AI Lip Sync Video Generator

One-speaker video + audio in. Output runs as long as the audio, up to 210 s.

ByteDance's Volcengine lip sync model redraws only the mouth of the person in your clip so it matches a new audio track, keeping their face and the rest of the shot. Swap a script, dub a talking-head video or fix one line without a reshoot.

Try AI Lip Sync See examples

Artwork: an illustration for this page, not model output

720p
Video + audio

Real footage, re-voiced

Only the mouth is redrawn

Volcengine built this model for talking-head clips: it keeps the speaker's appearance and changes the mouth shapes to follow the new audio. Everything outside the mouth comes from your original take.

Basic mode, for real-world shots

PicX runs the model's Basic mode, which ByteDance aimed at one speaker in more complex scenes, not only straight-to-camera framing. The faster Lite mode is not available on PicX yet.

The audio sets the length

Audio from just over 1 second up to 210 seconds. If your clip is longer than the audio it is cut; if it is shorter it loops. You get an MP4 at 25 fps.

When the words change but the shot is fine

Dubbing a talking-head video Drop in a translated or re-recorded voice track and the mouth follows it.
Ad script variations One spokesperson take, several reads: new offer, new hook, new call to action.
Fixing a line after the edit Re-record a wrong date or price and re-sync it instead of booking a reshoot.
Course and explainer updates Refresh an outdated section of a lesson while keeping the same presenter on screen.
AI voice-overs on real footage Pair a text-to-speech track with a clip of a real presenter for a matching mouth.

AI Lip Sync

Why pick AI Lip Sync

Try AI Lip Sync

V2VVideo to videoEdits your footage, not a photo.
210 sLong readsUp to three and a half minutes of speech.
BasicComplex scenesThe mode made for harder shots.
1080pInput up to 1080p360p to 1080p source clips.
25 fpsMP4 outputReady for any editor.
No promptAudio drives itNo text or settings to tune.

What AI Lip Sync costs

Billed per second of video, at the resolution you pick. The same prices the generator shows before you run it.

720p
20credits / sec
5s clip 100 creditsOn Starter≈ 36 clips / mo

Every model on every planCredits never expireSee plans

Pay for AI Lip Sync with crypto

Buy credits with Bitcoin, USDT, USDC, ETH, Solana and more — no card, nothing auto-renews, packs from $5, and 15% extra credits on crypto payments.

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Basic mode vs Lite mode

Volcengine ships the model in two modes. PicX runs Basic; Lite is listed for reference and is not available on PicX yet.

	Basic (on PicX)	Lite (not on PicX yet)
Made for	One speaker, complex scenes	One speaker, frontal video
Audio length	Over 1 s, up to 210 s	Over 1 s, up to 240 s
Source video	3 to 350 s, 360p to 1080p	3 to 350 s, 360p to 1080p
Scene segmentation and speaker detection	Supported by the model, not on PicX yet	No
Loop and start-time controls	No	Yes (not on PicX)
Output	MP4, 25 fps, length of the audio	MP4, 25 fps, length of the audio

Vocal separation (background-noise removal) is also not available on PicX yet. Live credit prices are in the pricing table.

How to use AI Lip Sync in 3 steps

1
Upload a clip of one speaker
Use a 3 to 350 second video, 360p to 1080p, with one person whose face stays fairly frontal: within about 30 degrees left or right is best.
2
Add the new audio
Upload the voice track, from just over 1 second up to 210 seconds. Clean speech with little music or noise behind it syncs best.
3
Generate and download
The result is an MP4 as long as your audio, with the mouth matched to the new words. You are billed per second of audio.

AI Lip Sync prompts to copy

Prompts to start from. Copy one, or open it in the generator with the model already picked.

Product read on a spokesperson take
This bottle keeps your coffee hot for twelve hours and cold for a full day. Honestly, I take it everywhere.
Try it
Same take, re-voiced as narration
Once upon a time, in a village at the edge of the sea, there lived a lighthouse keeper who never slept.
Try it
Fixing one wrong line
Quick correction: the sale ends this Sunday at midnight, not Saturday. Everything else stays the same.
Try it

Templates to start from

Browse all templates

AI Lip Sync questions

What is AI lip sync?

AI lip sync takes a video of someone talking plus a new audio track and redraws the mouth so it matches the new words. This model, from ByteDance's Volcengine, keeps the speaker's appearance and the rest of the frame from your original clip.

Can I lip sync any video to any audio?

Most talking-head clips work if they show one speaker at 360p to 1080p, between 3 and 350 seconds long. Keep the face fairly frontal: past about 45 degrees of head turn the mouth is not processed. The audio must be just over 1 second up to 210 seconds.

Can it make a photo talk?

No. This is video-to-video: it needs real footage of the person and re-times the mouth in it. If you only have a still image, you need a talking-avatar model instead.

Can I use it for dubbing or translated audio?

Yes. Upload the translated or re-recorded voice as the audio and the mouth follows its timing. There is no language setting, because the audio drives the result. Use clean vocals: background-noise removal is not available on PicX yet.

How long can a lip sync video be?

As long as your audio: from just over 1 second up to 210 seconds. A source clip longer than the audio is cut to fit; a shorter one is looped.

Which mode does PicX use, Lite or Basic?

Basic, the mode Volcengine made for one speaker in more complex scenes. Lite (frontal clips, audio up to 240 seconds) and Basic's optional scene segmentation and speaker detection are not available on PicX yet.

Does it work with two people in the shot?

It is built for a single speaker. Use a clip where one person is clearly the one talking, ideally facing the camera.

Is there a free AI lip sync video generator?

Not here: AI Lip Sync uses credits, billed per second of your audio. New PicX Studio accounts get one free image after sign-up, and credits never expire.

Re-voice a clip with AI Lip Sync

Upload one speaker's video and the new audio; the mouth follows the words.

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