Our take: A free browser audio editor with no sign-up button at all. In our test it made zero network requests after we opened a file (no upload, no ads), offered 20 effects and exported to MP3, WAV and FLAC. Menus are English only.
- ✓ No sign-up — tested
- ✓ Zero upload or ad requests — tested
- ✓ Exports MP3, WAV, FLAC — tested
- ! English menus only
- ? China access — not tested yet
Our test
Tested 28 Sep 2026 · Chrome desktop · test audio: 10-second WAV made in the browser (44.1 kHz mono, 882 KB)
How we checked privacy: We dragged the audio in and reviewed the browser’s resource log. There was no upload and not even an ad or analytics request. As its about page says, it runs entirely in the browser with no backend.
Data sheet
Every row shows how we know it
| Price | Free, no sign-up or login menu Tested |
|---|---|
| File handling | Processed in the browser, 0 network requests Tested + official |
| Export | MP3 (128/192/256 kbps), WAV, FLAC; mono/stereo; whole file or selection Tested |
| Effects | Gain, fades, voice noise reduction, EQ, compressor, normalize, reverb, speed, remove silence and more (20) Tested |
| Import | Local file, URL, new recording, local drafts Tested |
| Ads | None Tested |
| License | MIT open source Official |
| Menu language | English Tested |
| Access from China | — Not tested |
When to use it
Pick it to trim a recording or fix volume and noise without installing software or uploading anything. It suits sensitive audio such as interviews and lectures.
Before you use it
Menus are English only. Contrary to what we had noted before, it exports WAV and FLAC as well as MP3. For long multitrack work, desktop Audacity is steadier.
How to use it
- Open audiomass.co (no sign-up).
- Drag an audio file into the window or use File → Load from Computer.
- Select a range, cut or apply Effects, then choose a format in File → Export / Download.
Alternatives
Last verified 28 Sep 2026 · Found something outdated? Tell us. · Official site