How to lip sync a video to new audio

Lip sync starts from audio, not from a script. If you already have the recording — a real voiceover, a dub in another language, an old take with a fixed script error — this matches the mouth to it instead of synthesising new speech. Use AI Actor instead if you only have text and need the voice generated too.

Step by step

1. 1

   Upload the audio

   Up to 120 seconds. The output video ends up exactly as long as this track, so trim it to the part you need first.

2. 2

   Provide a face — a portrait or a clip

   A still portrait gives a static frame with just the mouth moving. A video clip keeps the original head movement and only the mouth is re-matched.

3. 3

   Set the real audio length

   This drives the price, so enter it accurately.

What makes the difference

• Use a clip instead of a still portrait when you want the person's original gestures and head movement kept — only the mouth changes.
• Clean, well-recorded audio with clear speech gets the tightest sync. Music underneath the voice or heavy background noise makes the match less precise.
• This is a redub tool, not a translation tool — generate or source the new-language audio yourself first, then sync the mouth to it.

Questions