BunCho video tools
Re-sync a video's mouth to new audio
Upload a video of someone talking and new lines, as a script or an audio file. You get the same video with the mouth movements redrawn to match the new voice — for dubbing, replacing a line or fixing a take.
Open the video tools Plans and pricing
Available on paid plans with an active subscription (not on the free plan or during the free trial). You see a credit estimate before anything is generated.
If you are not signed in, you sign in (or create an account) first and then land on the video tools.
What you put in, what you get
You provide
- The video to re-sync (up to 60 s; a large, front-facing face works best; MP4, MOV or WebM)
- The new voice: a script (up to 300 characters, choose a voice) or an audio file (up to 30 s)
You get
An MP4 with the mouth matched to the new voice. The length is the shorter of the video and the voice (up to 30 seconds).
Good for
- Replace a line in a video you shot with a new recording
- Dub your own video into another language
- Add dialogue afterwards to an AI avatar or a generated character clip
Models you can choose and their credits
sync-3 also handles side views and partly covered mouths, and uses more credits. sync lipsync-2-pro draws the mouth in more detail. Kling Lip-Sync is priced in steps (up to 5 s, up to 10 s) and is the lowest-credit option for 5 seconds. PixVerse LipSync also uses few credits and is fast.
| Model | Length | Approx. credits | Difference |
|---|---|---|---|
| sync-3Default | 1–30 s | about 669 for 5 s | Handles side views and covered mouths, more credits |
| sync lipsync-2-pro | 1–30 s | about 369 for 5 s | Detailed mouth |
| sync lipsync-2 | 1–30 s | about 221 for 5 s | Fewer credits |
| Kling Lip-Sync | 1–30 s | about 46 for 5 s | Priced in steps (up to 5 s, up to 10 s), fewer credits |
| PixVerse LipSync | 1–30 s | about 68 for 5 s | Fewer credits, fast |
The estimate screen lists the credits for every model with the same input, so you can compare first and only generate when you agree.
How to lip sync a video
Upload the video
Open Video tools > Lip sync and upload the video (up to 60 seconds).
Set the new voice
Type a script and choose a voice, or upload an audio file of up to 30 seconds.
Pick a model and get an estimate
Choose a model, press Estimate and compare the credits. Confirm that you have the rights to the files.
Generate and download
Press the generate button and download the result.
Other video tools
AI avatar
Make a video of a person talking from one image plus a script or audio file.
5 models · from about 126 credits for 5 s (P-Video Avatar)
Learn moreMotion control
Copy the movement of a person in a reference video onto the character in your image.
3 models · from about 151 credits for 5 s (P-Video Animate)
Learn moreLip sync
Redraw the mouth in a video of someone talking so it matches new audio or lines.
5 models · from about 46 credits for 5 s (Kling Lip-Sync)
Start & end frame
Make a video that moves from a first image to a last image, following your text.
6 models · from about 352 credits for 5 s (Kling 2.6 Pro)
Learn moreExtend a video
Continue a video from its last frame and add the new part to the end.
3 models · from about 805 credits for 5 s (LTX-2.3)
Learn morePlans and credits
- Available on paid plans (Watering, Seed, Feast, Full Course, Team & Business) with an active subscription. Not available on the free plan or during a paid plan's free trial.
- The tools use your studio's monthly AI credits — the same balance you use for novels, manga and video.
- Before generating, you see a credit estimate for the model and length you picked. Nothing is generated until you agree.
- No credits are used if a job fails or if you cancel it before it starts.
Rights and AI disclosure
- Only use images, audio and video that you own or have permission to use. Real people's faces and voices may only be used with that person's permission.
- Do not use the tools to impersonate someone or to make a person appear to say something they did not say.
- The results are AI-generated. When you publish them, label them as AI-generated or AI-edited according to the rules of the platform you post on.
- Model names are listed because you can choose them in the product. Listing them does not imply any partnership with or endorsement by their makers.
FAQ
What is AI lip sync?
Matching the mouth movements in a video to an audio track. This tool redraws the mouth of an existing video with AI so it matches new audio.
What if the video and the audio have different lengths?
The result uses the shorter of the two. Videos can be up to 60 seconds and the voice up to 30 seconds.
Can I change the mouth of someone else in a video?
Only with that person's permission. You may not make someone appear to say something they did not say in a misleading way.
Does it work with English or other languages?
Yes. With an audio file, the mouth is matched regardless of the language spoken.
How many credits does it use?
For 5 seconds: about 46 with Kling Lip-Sync and about 669 with sync-3 (as of October 30, 2026). The estimate shows the exact amount before you generate.
Related
Make it with the studio's video tools
Available on paid plans with an active subscription (not on the free plan or during the free trial). You see a credit estimate before anything is generated.