Add music to video
Drop a video and a music file, choose whether the music replaces the sound or plays under it, and save. The picture is copied without re-encoding, so only the sound is processed.
How to use it
- Drop a video.
- Choose a music file (MP3, M4A, WAV, OGG, FLAC…).
- Choose Replace or Mix and set the volumes.
- Click Start and download the video.
Frequently asked questions
What if the music is shorter than the video?
It is repeated until the video ends. A longer track is cut at the end of the video, optionally with a fade-out.
Does the video quality change?
No. The picture is copied as it is; only the sound track is re-encoded.
Is there a file size limit?
No fixed limit. The video is read in small slices and the result is streamed to your disk, so even multi-gigabyte files work without filling up memory.
Is my video uploaded to a server?
No. The file is read and written inside your browser tab using WebCodecs — nothing is uploaded, there is no account and no watermark. Once loaded, the page also works offline.