AudioMass
In-depth reviewFree online audio editor. Cut, trim, and apply effects to audio files directly in your browser without uploading to a server. Supports MP3, WAV, OGG. Privacy-respecting.
AudioMass, as it opens in a browser tab.
Not sure how to add AudioMass to your home screen? Step-by-step for Chrome, Safari, Firefox and Edge — it takes about ten seconds, and there is no app store involved.
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How to install AudioMass as a PWA
Screenshots
Why we recommend AudioMass
Editing a sound file usually means installing something. AudioMass does the whole job — trimming, fading, normalising, compression, reverb, pitch and speed — in a browser tab, with the audio never leaving your machine: it is read from local disk and processed by the Web Audio API on your own CPU. That matters for the obvious privacy reason, and for a less obvious practical one: there is no upload wait. Open a 40 MB WAV and you are editing it immediately, not watching a progress bar. It is free, open source, and has no account, no watermark and no export limit — a rare combination in audio tools, where the free tier usually stamps something on your output.
Best use cases
Cutting the dead air from the start and end of a podcast recording before sending it to an editor. Trimming a sample down to the bar you actually want. Normalising a batch of voice memos so they play at the same level. Doing a quick fix on a borrowed machine where you cannot install software — a school computer, a client's laptop, a friend's desktop. It is the tool for the ten-minute audio job that does not justify opening a full workstation.
Honest limitations
It is a single-track waveform editor, not a multitrack studio: you cannot layer a voice over music and mix them. There is no MIDI, no instrument, no plugin support. Very long files are limited by browser memory — an hour of uncompressed audio will strain a modest machine, and the tab can be killed by the operating system. And there is no autosave: close the tab without exporting and the edit is gone. Export early if the session matters.
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AudioMass in our guides
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