Audio Mixer
Layer tracks with their own volume, start time, pan and fades, then export one mix.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Audio Mixer works
Tracks are decoded and mixed with the Web Audio API on your device, then encoded with ffmpeg for compressed formats.
Input: MP3, WAV, M4A, OGG, FLAC, AAC, MP4, WEBM. Output: MP3, M4A, OGG, WAV, FLAC.
How to use Audio Mixer
- Drop two or more tracks.
- Set volume, start time, pan and fades for each.
- Preview the mix.
- Export.
Tips
- WAV is lossless but large; MP3/AAC/OGG are compact for sharing.
- Engines load on first use and are cached afterwards.
Audio Mixer FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
Related tools
- Audio Merger: Join multiple audio files into one track.
- Audio Editor & Trimmer: Trim, fade in/out, change volume and export with a waveform.
- Volume Booster and Normalizer: Make quiet audio or video louder, or even out loudness to a standard level (EBU R128).
- Audio Converter: Convert MP3, WAV, OGG, AAC, FLAC and M4A.