Tool guide
Sometimes an MP3 is simply the wrong working format: Unity wants PCM, a spectrum script reads only WAV, and an editor that re-encodes on every save keeps stacking artefacts. Here the MP3 is decoded by the browser itself and written out as WAV with the sample rate and channel count intact, without the file ever leaving your disk. The trip back is handled by the WAV to MP3 tool.
No — that is the common misconception. Whatever the encoder threw away is gone; the WAV just stores the already-damaged signal without further compression. The real benefit is that you can cut, normalise and re-save as often as you like without stacking new artefacts.
MP3 works in 1152-sample blocks and pads the start and end with encoder silence. Without gapless tags the decoder keeps that padding, so the output can be tens of milliseconds longer. For editing it hardly matters — trim it in a second.
The limit is your tab's memory, not the site. An hour of decoded stereo is around 600 MB, so on a 4 GB device the tab may die. Split audiobooks and long lectures into half-hour chunks; ordinary songs and podcasts are fine.
No. The WAV written here carries audio data and a RIFF header only, and ID3 tags are dropped during decoding. If metadata matters, re-enter it in your editor afterwards or keep the original MP3 as the reference.
Yes, on both Android and iOS; the file field opens your system file manager or the Files app. Two caveats: you need several times the MP3's size in free space, and mobile browsers are quicker to evict a busy tab on long recordings.
No. The page never transmits the file contents; the browser's own decoder does the work on your device and the result lives in tab memory until you save it. That makes it safe for unreleased recordings and draft material.
Before: track.mp3 — 4.8 MB, 192 kbps, 44.1 kHz, stereo, 3:30
After: track.wav — 37 MB, 16-bit PCM, 44.1 kHz, stereo, 3:30
Before: click.mp3 — 9 KB, 128 kbps, 44.1 kHz, mono, 0.4 s
After: click.wav — 36 KB, 16-bit PCM, 44.1 kHz, mono
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