Online Tool Store
Multi-Track Mixer
Upload multiple audio tracks, preview the mix with per-track volume, mute and solo, and download the result as one clip-free WAV file.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example tones shown — upload your own tracks; they replace this example.
How it works
- Drop multiple audio tracks on the upload area, or click it to choose files — a working example plays immediately so you can try Play, Mute, and Solo before uploading anything.
- Adjust each track's volume with its own slider, or mute/solo it — changes apply live if you're previewing with Play.
- Remove a track with the ✕ button if you uploaded the wrong file.
- Download the mixed-down result as one WAV file.
Mixing decodes each track with the Web Audio API, scales each one by its slider's gain, and sums them sample-by-sample into a single buffer — a lightweight version of what a DAW's mix-down step does. If the summed result would clip, it's scaled back down to full volume before being rendered to a downloadable WAV file, so combining several loud tracks doesn't distort the output.
FAQ
Are my audio files uploaded anywhere?
No. Mixing happens entirely in your browser using the Web Audio API — your files are never sent to a server.
How many tracks can I mix at once?
As many as your browser can comfortably decode and play — everyday mixes of a handful of tracks work smoothly.
Can I mute or solo individual tracks?
Yes — each track has its own volume slider plus mute (M) and solo (S) controls, live during preview playback: soloing a track silences every other track until you un-solo it, and muting always silences that track regardless of solo state.
What format is the final mixed-down file?
A single 16-bit WAV file combining all unmuted tracks at their set volumes, ready to download.
What audio formats can I upload?
Anything your browser's Web Audio API can decode — typically MP3, WAV, M4A/AAC, and OGG. An unsupported or corrupted file is skipped with a clear message rather than breaking the mix.
Will loud tracks clip or distort in the download?
No — after summing all tracks, the mix is checked for its loudest sample and scaled down if needed so nothing exceeds full volume, avoiding the harsh distortion a naive sum can produce.
How we compare
| Feature | Online Tool Store | Full DAW (Audacity, Logic) | Command-line mixing |
|---|---|---|---|
| No file upload to a server — runs in your browser | ✓ | Desktop install required | Needs a terminal + install |
| Live preview with mute and solo before exporting | ✓ | ✓ | No interactive preview |
| Free, no setup | ✓ | ✓ | ✓ |
A full DAW is the right call for detailed production. Multi-Track Mixer is for the quick case — a few tracks, one download — no install required.