What it is: AI lip sync is when AI makes a person’s mouth move to match new words. You can take a video of someone talking and change what they say.
Who it’s for: Anyone curious about AI dubbing and talking-head videos
Best if: You want to dub a video in another language
Skip if: You work in professional dubbing
Old way: if you wanted a video dubbed into another language, you’d hear the new voice but the mouth still looked wrong. The “dubbed movie look.”
New way: AI lip sync. The AI watches the original mouth. Then it reshapes the mouth to match the new words in the new language. The speaker looks like they actually said it in the new language.
How people use it
- Dubbing. A CEO’s announcement in 20 languages, all looking real.
- Fixing mistakes. An actor said a line wrong. Lip-sync a new take without reshooting.
- Education. A history teacher’s video reaches kids in any language.
- Marketing. One ad for every country.
Tools that do it
- HeyGen
- Synthesia
- Rask AI
- Runway
- ElevenLabs (voice + lip sync partners)
Warning about misuse
Lip sync AI is also how deepfakes are made. The same technology that dubs a movie can be misused to make a fake video of someone saying something they never said. Always check video sources if something seems off.
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