Make new speech naturally match the person on screen
Upload a person video and target audio. AI adjusts mouth movements to follow the new voice, so you can create dubbed videos, localized content, digital-presenter clips, and social edits without filming again.
Choose a video with a clear front or side view and an unobstructed mouth.
Supports MP4 and MOV · 500 MB
Upload target audio
Choose the new speech or dubbing track for the person in the video.
Supports MP3, WAV, AAC, M4A, and OGG · 10 MB
Sync settings
Choose how the uploaded video and target audio should be synchronized.
Processing mode
Estimated credits
Calculated after upload
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Upload a video to continue
For a more natural result, keep the target audio close to the original video length and make sure the mouth is clearly visible.
How it works
Make every new voice line match the speaker's mouth
AI video lip sync analyzes the face, mouth movement, and speaking rhythm in a video, then regenerates natural lip shapes from the uploaded target audio.
Unlike simply replacing an audio track, it also adjusts mouth motion so pronunciation, pauses, and timing better follow the new speech.
It is useful when you want to keep the original person, scene, and camera work while changing only the dialogue or language.
Core AI video lip-sync features
01
Frame-level mouth and audio sync
AI analyzes mouth movement frame by frame and adapts lip shapes to fast speech, pauses, and continuous sounds while keeping timing close to the target audio.
02
Keep the original person and footage
The workflow focuses on the mouth area rather than regenerating the full video, helping preserve the person, clothing, background, camera, and overall frame.
03
Multilingual video dubbing
Pair the same video with target audio in another language to create localized brand, course, product, and social-media versions.
04
Faster dubbing workflows
Upload video and audio without manually adjusting mouth shapes frame by frame, simplifying multiple language and script versions.
How to use AI video lip sync
01
Upload the original person video
Choose footage with a clear face and speaking motion. Front-facing or slightly angled faces are usually more stable.
02
Upload target audio
Add the new script, language, or voice track. Keeping its duration close to the source video is recommended.
03
Start generation
Review video length, audio details, and the credit estimate, then start lip synchronization.
04
Preview and download
When processing is complete, preview the synchronized video and download the result after checking it.
Where can AI video lip sync be used?
Multilingual video localization
Create language versions of product, company, brand, and tutorial videos without filming each version again.
Digital presenters and talking videos
Replace audio in presenter, digital-human, or virtual-host videos to create new scripts and language versions.
Courses and training
Localize lessons, training materials, and knowledge videos while reducing repeated recording and complex post-production.
Social content remixes
Prepare new dubbing and localized versions for TikTok, YouTube Shorts, Instagram Reels, and other platforms.
Advertising and brand video
Keep completed ad footage while replacing voice tracks for different regions, campaigns, or product versions.
Film and short-drama dubbing
Create dubbing drafts, language previews, and early validation for narrative clips and short-form productions.
How is AI lip sync different from replacing an audio track?
Comparison
AI video lip sync
Audio replacement
Replace video audio
AI video lip syncSupported
Audio replacementSupported
Adjust mouth movement
AI video lip syncAutomatic
Audio replacementNot supported
Match new speech to lips
AI video lip syncMore natural
Audio replacementOften out of sync
Multilingual production
AI video lip syncBetter suited
Audio replacementMay look inconsistent
Manual frame editing
AI video lip syncUsually unnecessary
Audio replacementOften required
Talking-person videos
AI video lip syncSuitable
Audio replacementLimited result
Standard audio replacement changes only the sound while the person keeps the original mouth movement. AI lip sync adapts the mouth to the new audio so the picture and voice feel more coordinated.
How to get better lip-sync results
1
Use a clear person video
Keep the face sharp and avoid heavy blur, overexposure, or very dark lighting.
2
Avoid covering the mouth
Hands, microphones, hair, and other objects should not cover the mouth for long periods.
3
Use a reasonable face angle
Front or slight side views are more stable; rapid turns and leaving the frame can affect the result.
4
Keep audio duration close
A target track close to the source duration reduces mismatches between speech rhythm and visible movement.
5
Use clean audio
Choose stable-volume audio without heavy noise or overlapping speakers.
Why use our AI video lip-sync tool?
Generate online
Upload video and audio directly without installing professional editing software.
Simple workflow
No need to learn complex keyframes, face tracking, or manual audio alignment.
Use on demand
Use credits for actual generation tasks across personal, marketing, and content workflows.
One creative workspace
Use AI video generation, motion control, background tools, image generation, and lip sync on one platform.
AI video lip-sync FAQ
Learn how source footage, target audio, language, duration, and face visibility affect lip synchronization.
What is AI video lip sync?
AI video lip sync automatically adjusts a person's mouth movement to target audio. After a person video and new voice track are uploaded, the system analyzes the face and audio timing to create a new video whose lips more closely match the speech.
How is AI lip sync different from video dubbing?
Standard dubbing replaces the original sound but does not change the person's mouth. AI lip sync also adjusts mouth motion to the new audio, making picture and voice feel more coordinated.
Can I use audio in another language?
Yes. You can upload target audio in another language to create a localized version. Results vary with pronunciation, speed, face angle, mouth visibility, and video quality.
Which videos work best for lip sync?
Videos with a clear face, visible mouth, stable lighting, and a front or slight side view generally produce better results.
Must target audio have the same length as the video?
It does not need to match exactly, but a similar duration is recommended. Large differences can make visible movement, speaking rhythm, or pauses feel less natural.
Can I lip-sync videos with multiple people?
Video with one main speaker is usually more stable. Simultaneous speakers, frequent cuts, or overlapping faces make generation more difficult and results may vary.
Does lip sync change other parts of the person?
Processing usually focuses on the face and mouth. The system tries to preserve the person, clothing, background, and camera image, though minor facial-detail changes may still occur.
Can it create digital-presenter videos?
Yes. You can add new audio to real-person, digital-human, or virtual-host footage to create different scripts and language versions.
How long does generation take?
Processing time depends on video length, file size, current queue volume, and server status. After submission, progress and results can be viewed in generation history.
Let the person in your video naturally say something new
Upload a person video and target audio to create naturally synchronized speech without filming again or adjusting every frame by hand.