Upload a MP3 file and get a WAV back. No signup, no watermark, no limit on how many.
MP3 is the format that made portable music work, and thirty years on it is still the one every device, car stereo, DAW and browser will open without being asked twice.
Where you run into it: Downloads, podcast feeds, old music libraries, anything a client sends you and expects you to just play.
What it costs you: It throws audio away to get small, and at 320 kbps almost nobody can hear what went. What matters is that the discarded part never comes back.
WAV is raw, uncompressed PCM in a Microsoft container: the audio exactly as it was sampled, with nothing clever done to it.
Where you run into it: Recording sessions, sample libraries, video editors, anything that has to be edited rather than merely listened to.
What it costs you: It is enormous — roughly 10 MB a minute in CD-quality stereo — and it carries almost no tagging, so a folder of WAVs is a folder of filenames.
Your MP3 is decoded back to plain 16-bit PCM and written into a WAV header. Nothing is compressed, nothing is recovered, and you may notice there is no quality setting on this page — because there is nothing to decide. A WAV stores every sample the decoder produces. One detail works in your favour: the decoder reads the delay the encoder wrote into the MP3 and trims it, so the WAV starts where the music starts instead of a few milliseconds late.
The reason to do this is nearly always a program that refuses MP3 input. Phone systems are the classic case — Asterisk, 3CX and most IVR upload forms want plain PCM WAV, often mono — along with Windows system sounds, hardware samplers and older editing software. One thing does carry across, against WAV's reputation: artist, title and album are written into the file's INFO chunk and read back out of it. The cover art is not — an attached image is dropped — and a fair amount of software ignores WAV tags in any case, so name the file properly before you convert.
Yes, entirely, and there is no cap on how many files you convert. No account, no watermark, no trial.
No, and the reason is worth being clear about. The WAV is a faithful record of the decoded MP3, including the parts the encoder removed: a 128 kbps MP3 keeps essentially nothing above 17 kHz, and the WAV preserves that emptiness exactly. Where quality really gets spent is afterwards — encode this WAV back to MP3 and you are on a third generation, so edit from the WAV and export once.
About 10 MB a minute in CD-quality stereo, and here is the part almost nobody expects: the MP3's bitrate makes no difference at all. A 128 kbps file and a 320 kbps file of the same song produce WAVs of exactly the same size, because the size depends only on length, sample rate and channel count. Four minutes is roughly 40 MB whichever MP3 you started from.
Yes — WAV is one of the formats this converter writes, so the reverse page exists at /wav-to-mp3/. The trip out is exact, because WAV discards nothing — it is the return to MP3 that re-encodes. A round trip therefore costs one more generation rather than two, and the WAV in the middle was never an improvement on the MP3 you started with.
The file is uploaded to do the conversion — nothing here runs in your browser — and both your upload and the converted result are deleted the moment the file is sent back. Nothing is stored and nothing is logged beyond the request itself.