Add Music to Video — Multi-Track Audio Mixer

A free browser-based tool for adding background music, sound effects, or voiceover to any video. Supports MP4, WebM, MOV and other formats with full volume control.

How it works

  1. 1Upload your video — drag and drop or click to browse
  2. 2Upload your audio file — music, SFX, or voiceover
  3. 3Set the music volume and choose replace or mix
  4. 4Click Export Video and download the result

Layer background music, sound effects, and voiceover on your video

Upload video file

MP4, WEBM, MOV, MKV, AVI · drag and drop or click

Features

  • Replace or mix original audio with one toggle
  • Per-track volume control
  • Auto fallback when codecs don't match
  • AAC 192 kbps export for universal compatibility
  • Web-optimized output (faststart)
  • No watermark, no signup, no upload

All processing happens locally in your browser. Your files never leave your device.