Replace audio in a video, swap soundtracks privately

Drop in a new soundtrack or voiceover without re-exporting from a DAW. Supercut swaps audio locally while copying the video stream as-is.

Open the editor, freeNo upload · No sign-up to start · 100% private

Just type

“Use audio from @music-clip”

Works with

MP4MOVWebMMP3

How it works

  1. 1

    Load video and audio

    Add the main video plus a second clip with the audio you want, all local.

  2. 2

    Ask to swap audio

    Say “use audio from @clip-name.” Supercut maps the new track onto your video.

  3. 3

    Export with new audio

    Preview sync and download. Video quality is preserved; only audio is re-encoded.

Tips

  • The video stream is copied as-is, only audio re-encodes.
  • Drop a music file in and reference it by name.
  • Mute the original first if you only want the new track.

Why it stays private

Supercut decodes, edits and exports your video entirely in your browser with WebAssembly. Your video files never leave your device. To plan the edit, the AI gets your request, the words said in your clip and its sound levels (both worked out on your device), and a few low-resolution frames only if you turn that on. Read more in our Privacy Policy.

Related tools

Who uses this

Frequently asked questions

Does swapping audio hurt video quality?

No. The video stream is copied verbatim. Only the audio track is re-encoded.

Can I add music from another file?

Yes. Drop the music file into the media panel and reference it with @ in your prompt.

Is anything uploaded?

No. Audio swap runs entirely in your browser.

Ready to try it?

Drop a clip and describe the edit, it runs right here in your browser.

Open the editor