AudioMass — Online Audio & Waveform Editor
Edit, trim, and apply effects to audio directly in your browser with a free, open-source waveform editor. Runs entirely client-side — nothing you upload is ever sent to a server.
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About AudioMass — Online Audio & Waveform Editor
AudioMass is an open-source, MIT-licensed audio and waveform editor for the browser. It supports single-track waveform editing (cut, copy, paste, fade, normalize) as well as a full multitrack mode — layer clips across multiple tracks, drag them around the timeline, crossfade overlaps, record onto armed channels, and bounce everything back down to one file. Built-in effects include EQ, noise reduction, and standard filters, with export to WAV and MP3. The build here is self-hosted directly from the AudioMass project's own source and runs entirely client-side: nothing you upload or record is ever sent to a server.
How to use
- Load an audio file via File → Open, or record directly from your microphone.
- Select a region on the waveform to cut, copy, fade, normalize, or apply an effect from the FX menu.
- Switch to multitrack mode to layer multiple clips, arm tracks for recording, and adjust each track's volume and pan.
- Export your finished mix via File → Save/Export as WAV or MP3.
Frequently asked questions
- Is my audio uploaded anywhere?
- No. AudioMass runs entirely in your browser via JavaScript and the Web Audio API — nothing you open, record, or edit is ever sent to a server, including by this site.
- Can I record audio directly in the browser?
- Yes — AudioMass can record from your microphone straight onto a track, including onto armed channels in multitrack mode.
- Does it support multiple tracks?
- Yes — beyond single-waveform editing, AudioMass has a full multitrack mode for layering, arranging, and mixing multiple clips.
- What formats can I export to?
- AudioMass exports to standard WAV and MP3 files that play anywhere.