Put a song under a video, or replace its sound with music. Pick the part of the song to use on its waveform, set the music and the video's own sound to the levels you want, and loop or fade the music. The picture is copied as is, so it is quick and the quality stays the same. Everything runs in your browser, so nothing is uploaded.
Choose where the song starts by dragging over its waveform, and preview it
Music volume up to 200%, and the video's own sound from 0% (replaced) to 100%
Repeats a short song to fill the video, and fades the music out at the end
The picture is copied, not re-encoded: quick, and no quality loss
Works with MP4, MOV, MKV, WebM and phone videos, and MP3, M4A, WAV and other songs
Runs in your browser: nothing is uploaded. Free, no signup, no watermark
Add a song before posting, with the voices in the clip still audible underneath.
Replace wind and traffic noise with music.
Put background music under a demo or a highlights clip.
The two volume sliders are independent. To keep people talking in the clip audible, leave the video's own sound at 30% to 60% and the music around 100%. To use only the music, slide the video's own sound to 0: its sound is replaced. The music can go up to 200% if the song is quiet.
The highlighted part of the waveform is the section that plays under the video: it is as long as the video. Drag it to start the music at the chorus, or wherever you like, and press play to hear it. If the rest of the song is shorter than the video, it repeats from the same point, unless you turn repeating off.
Instagram, YouTube and Facebook can mute or block videos that use songs you don't have the rights to. Use your own music, royalty-free tracks, or the app's own music library when you post publicly.
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