RRecast

All tools/Replace or add audio track

Replace or add audio track

Keep the picture, replace the voice or music with a local audio file.

Runs in your browser
No signup
Max 200 MB

How to use

  1. Add videoChoose the picture track you want to keep.
  2. Add audioChoose the new soundtrack.
  3. ExportWe copy the video stream and mux the new audio.

FAQ

Is video re-encoded?

No — video is stream-copied when possible, which is fast.

What if lengths differ?

Output stops at the shorter of video/audio (`-shortest`).

Private?

Yes, both files stay in the browser.

Need full video localization?

Choose a minute pack or monthly plan, then create a dubbed video with subtitles. Up to 90 seconds per source video.

Open Studio

Recast · One video. Every market.