Voice-Over Music Mixer
Layer a Voice-Over Onto a Music Track
Need to use Voice-Over Music Mixer right now?
A real FFmpeg build compiled to WebAssembly runs the mix entirely inside your browser.
Add two or more audio tracks to mix together
Processed locally in your browser — never uploaded
Mixes all tracks together to play at the same time — a voice-over with background music, for example — not end-to-end joining. For sequential joining instead, use Audio Joiner. The result runs as long as the longest input track.
Features
- Runs entirely in your browser
- Privacy-first — your data is never uploaded
- Real-time, instant results
- 100% free, no sign-up required
- Works on desktop, tablet, and mobile
- No installation needed
Who uses this tool?
About Voice-Over Music Mixer
Layering a voice-over on top of background music, combining separately-recorded instrument tracks, or blending multiple audio sources into one simultaneous mix is a fundamentally different operation from joining files end-to-end — this is about tracks playing together at the same time, not one after another. This tool mixes any number of audio tracks using FFmpeg's amix filter.
A real FFmpeg build compiled to WebAssembly performs the mix entirely inside your browser, combining all input tracks into a single output where they all sound simultaneously from the start — this is a genuine audio mix, not a sequential concatenation.
The mixed result runs as long as the longest individual input track, with shorter tracks simply ending early within the mix rather than looping or being padded — this matches the typical expectation for layering a shorter effect or voice clip over a longer background track.
Because multiple audio sources summed together can produce a signal louder than any single source, some volume management is worth keeping in mind — if the mixed result sounds distorted or clipped, consider reducing the volume of individual tracks (using the Audio Volume Booster with a negative gain) before merging them together.
How it works
- Add two or more audio tracks. Select the tracks you want to play simultaneously.
- Mixing runs locally. All tracks combine to play together from the start.
- Download the mixed audio. One MP3 file, running as long as the longest track.
Examples
Layering a voice-over with background music
Input
voice track + music track
Output
one mixed MP3 with both playing simultaneously