Replace the Audio
Put music or a clean recording onto a clip, in place of what the camera heard.
- Add
- Adjust
- Make
- Keep
How to use this tool
- Add your files — drag them onto the page or choose them. They stay on your device.
- Add the video first, then the audio file (the second slot).
- Choose what happens when lengths differ: Match the video ends the audio when the picture does; Let the audio finish holds the last frame.
- Press “Replace the audio” and download the results, individually or as one ZIP.
About this tool
Put music or a clean recording onto a clip, in place of what the camera heard. Free and unlimited, and nothing is uploaded: it all runs in your own browser. Everything is analysed and produced on your own device — nothing is uploaded anywhere, and you can verify it: the tools keep working even offline.
Privacy & limitations
Files over roughly 2 GB, or long 4K videos, can exhaust the browser's memory — everything runs on your machine, so your machine is the limit. The replacement is a full mix-down: when Keep the original... mixing is off, the old track is discarded, not ducked under the new one.
Last updated:
Frequently asked questions
Does it re-encode the video?
No. The picture is copied through untouched and only the audio is written, so the quality is bit-for-bit what you started with and a long clip finishes in about the time it takes to read it.
What if the music is longer than the video?
You choose. Matching the video ends the file when the picture does, which is almost always what people mean. Letting the audio finish holds the last frame until the sound runs out.
Can I keep the original sound underneath?
Yes, there is an option to mix rather than replace. That does re-encode the audio, because two tracks have to be combined into one.
Does it sync to the beat?
No. It starts both at the beginning. Lining a cut up with music means trimming the clip or the track first.