Add music to a video.
Free, no signup, no watermark. Your video never leaves your device.
Your song under your voice, dipping by itself when you talk.
Add my musicNo clip handy? Tap Try a sample in the editor.
How do I add music to a video for free?
Open the video in Cutmallow's free editor, go to Music and add a song from your device (MP3, M4A, WAV, OGG, Opus or FLAC). It plays under your video and, with Auto-duck on, dips by itself whenever someone talks, then comes back up. Set the volume, where the song starts, looping and fades, then export an MP4 with no watermark. Nothing is uploaded.
Updated
- Ducking
- Automatic
- Fades
- In and out
- Song formats
- MP3, WAV and more
- Watermark
- None
How to do it in three steps
Drop your video into the editor.
Open Music and add a song from your device.
Keep Auto-duck on, set the volume, then export.
Then keep going in the same place: add captions, zooms and a style, so the Short is finished before you leave the page.
How it works
Auto-duck listens for speech in your video with the same on-device speech detector that powers silence removal, and lowers the music only while someone is talking. That keeps the voice clear without you drawing volume curves by hand.
The song is mixed into the export on your device. Use music you have the rights to: platforms like YouTube and Instagram check uploads for copyrighted songs.
Tips for a better result
- Keep the music around 20 to 30 percent volume under a talking-head video.
- Start the song at its strongest part with the start point, not at its intro.
- Use royalty-free or your own music so the video is not muted after posting.
One flow instead of three apps
Every free tool here opens the same Cutmallow editor, so the whole Short gets finished in one place.
- Pauses, noise and captions in one editor, instead of a different app for each job.
- Private: the video is processed on your device and never uploaded.
- Works on phones as well as laptops, in the browser you already have.
- No credits, no usage limits, no watermark.
Frequently asked questions
Something else? Write to [email protected].
What does auto-duck do?
It lowers the music while someone is speaking and brings it back up in the pauses, so the voice stays clear. You choose how much it dips.
Where do I get music?
Any song file on your device works. Use music you have the rights to, such as royalty-free libraries or your own tracks, so platforms do not mute the video.
Which browsers support music?
Chrome and Edge, and Safari 26 or later on Mac and iPhone.
Is my video or song uploaded?
No. Your video never leaves your device. The mix is made on your device.
Is there a watermark or a paid plan for this?
No. The export is clean, in full quality, with no account. Cutmallow runs on your device, so there are no server bills to pass on.