Mix Background Music
Lay a background music track under a video's existing audio. Drop a video and an audio file (any order).
About Mix Background Music
Mix Background Music lays a music track underneath a video's existing audio so both play together. Drop in a video and an audio file in any order and it blends them into a single MP4 — handy when you want a soundtrack behind narration or natural sound. It runs in your browser, so neither file is uploaded.
- Category
- media
- Input
- Accepts: video/* or audio/*.
- Output
- Outputs: video/mp4.
- Cost
- Free, runs in your browser
- Memory
- high
- Install group
- ffmpeg
Common uses
- Add a background music bed under a talking-head video without losing the voice
- Put a soft soundtrack behind travel B-roll that has only ambient sound
- Layer royalty-free music under a product demo while keeping the on-screen audio
- Give a slideshow-style video a music track while preserving any clip audio
- Underscore a tutorial's narration with quiet background music
- Blend a new music track into an interview clip for a more polished feel
Frequently asked questions
Does it replace the original audio or mix with it?
It mixes. The video's existing audio plays alongside the background music track you add.
Does the order I drop the files in matter?
No. You can add the video and the audio file in either order — the tool figures out which is which.
What if the music is longer or shorter than the video?
The output follows the video. A longer track is cut off at the end of the video; a shorter track stops when it runs out.
What format is the result?
An MP4 video with the combined audio.
Are my files uploaded?
No. The mix is done in your browser and both files stay on your device.
Keywords
- video
- audio
- mix
- background
- music
- overlay
- soundtrack
- duck
- blend