Add music to your video

Overlay background music, voiceover, or any audio track onto your video. Adjust volume, sync timing, and export — all processed locally in your browser.

FAQ

Can I keep the original video audio and add music on top?

Yes. You can mix the original audio with the new music track and control the volume of each independently.

What audio formats are supported?

MP3, WAV, AAC, OGG, and FLAC. Most common audio formats work out of the box.

Can I trim the music to match the video length?

The audio will be trimmed automatically to match the video duration. You can also set a custom start offset.

Will the output quality be affected?

Video quality is preserved. The audio is mixed at original quality.

Can I add multiple audio tracks?

Currently one audio track at a time. For multiple layers, apply them sequentially.

Does it work on mobile?

Yes. CutFast works on mobile browsers including Safari and Chrome on iOS and Android.