Add audio to a video

How to add music to a video

Drop the video in and put the sounds you want into the library. Drag each of them onto the timeline where it should play. A clip can be moved, grabbed by its edge and trimmed, split under the playhead and given its own volume, fade in and fade out. The preview plays exactly what the export will produce.

You can use several tracks at once: music on one, a voice-over on another, room tone on a third. The original video sound has its own row at the top, so muting it takes one slider when only the music should be heard.

Frequently asked questions

Which audio formats can I use?

MP3, M4A, AAC, WAV, OGG, Opus and FLAC. The result is always an MP4 with an AAC track, which every phone and social network can play.

Can one file be used on the timeline more than once?

Yes. Upload it once and drop it onto the timeline as many times as you like, for instance the same motif at the start and at the end. Every clip keeps its own trim, volume and fades.

What happens if the music is longer than the video?

The result ends with the video and the music is cut off there. The part of a clip that overhangs is hatched on the timeline, so you see up front what will not make it in. Music shorter than the video leaves the rest of it without any.

How do I get music under speech?

Leave the original sound on and pull the music down to about a quarter. A two second fade in and fade out at the ends helps, so the music does not jump in mid bar.

Does the picture quality suffer?

No. For MP4, MOV and MKV the picture is only repackaged and just the audio is re-encoded. WebM and AVI carry codecs that do not belong in an MP4, so there the picture has to be re-encoded and the export takes longer.

Is the video uploaded to a server?

No. Editing and export run in your browser through ffmpeg in WebAssembly, the files stay on your computer.