Add Music to Video

Add Music to Video features

• 01

  Replace or mix

  Swap the audio completely for your track, or blend background music under the existing voice and sound.

• 02

  Auto-loop and volume

  Shorter music loops to fill the entire video, and a volume slider sets how loud the soundtrack sits.

• 03

  Private, no uploads

  FFmpeg runs in your browser via WebAssembly — the video and music are processed on your device, never uploaded.

Add Music to Video FAQ

What is the difference between Replace and Mix?

Replace removes the original audio and uses only your track. Mix keeps the original sound and layers your music underneath, which is ideal for adding background music to talking videos.

What if my music is shorter than the video?

The track loops automatically so it covers the full length of the clip, and the output is trimmed to the video's duration.

Which audio formats can I add?

MP3, WAV, M4A, AAC, OGG, OPUS and FLAC are all supported as the soundtrack.

Is my video uploaded to a server?

No. All processing happens locally in your browser with WebAssembly FFmpeg, so your files stay on your device.

Does the video quality change?

No. The video stream is copied unchanged and only the audio is re-encoded, so reframing or recompression doesn't degrade the picture.