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What is AI lip sync?
Lip sync is AI that matches a person's mouth movements in a video to a new audio track.
- Category Media & creative
- Also called lip-sync, lip syncing
- Updated 20 Oct 2026
Lip sync, explained simply
Lip sync means the mouth moves in step with the words. AI can change the mouth in a video so it matches new speech.
It is used for dubbing a video into another language, so the speaker looks like they are saying the words.
It is also used to make avatars and photos talk. This matters for creators who want to reach more viewers.
The same tech can fake people saying things they never said. Label AI edited videos clearly.
On ITG Now, daily AI news stories cover video and voice tools, including ones that sync mouths to audio.
Related terms
AI avatarDeepfakeText-to-speechText-to-videoContent Credentials
Questions people ask about Lip sync
Is AI lip sync free?
Some open source tools are free. Most online services limit free use.
Can lip sync be used for fake videos?
Yes. That is why labels and Content Credentials matter.
What does lip sync need to work?
Usually a video or photo of a face and an audio clip. The AI does the rest.