Upload a Opus file and get a WAV back. No signup, no watermark, no limit on how many.
Opus is the best lossy codec in general use: at 64 kbps it beats formats running at twice that, which is why real-time applications standardised on it.
Where you run into it: WhatsApp and Telegram voice notes, Discord, Signal, Zoom, and most browser-based calls.
What it costs you: Everything can play it inside an app and remarkably little can play it as a file — a voice note saved to a desktop is the classic case, and the usual reason to convert one.
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.
Opus runs at 48 kHz internally whatever it was fed, so this is the one conversion here where the output sample rate is decided by the codec rather than by your file. A voice note recorded at 16 kHz decodes to a 48 kHz WAV; so does one recorded at 8 kHz. Nothing is lost in that — there was never any content above the original band to begin with — but the file comes out three times larger than the audio needs, and if something downstream wants 16 kHz you will have to resample it yourself.
Almost every .opus file in circulation is a voice message — WhatsApp, Telegram, Signal — or a Discord recording, and the destination is nearly always a transcription tool or an editor. Two practical points for that. Speech recognition models generally want 16 kHz mono, so if the tool offers a sample rate, take it rather than feeding a 48 kHz file. And keep the .opus: it is the format built for sending voice, it is a fraction of the size, and the WAV is only useful to the tool you made it for.
Yes, entirely, and there is no cap on how many files you convert. No account, no watermark, no trial.
No further loss, and no recovery either. Opus is worth a word of credit here: at 24 kbps it holds speech better than any other codec in general use, so the source you are decoding is probably very good for its size. What the WAV buys you is not fidelity but access — Opus plays inside almost every messaging app and is refused by a remarkable amount of software the moment it becomes a file on a desktop.
Startling, and the 48 kHz decode is why. A one-minute voice note at 24 kbps is around 180 KB; the same minute as a mono 48 kHz WAV is about 5.5 MB, so expect roughly thirty times larger. Stereo music doubles that again. None of it is wasted precision so much as wasted room: speech carries nothing above a few kilohertz, and a 16 kHz mono WAV would hold the same information in a sixth of the space.
Not here. Opus can be read but not written by this converter — ffmpeg decodes it happily, and encoding back to it would mean a format almost nothing plays. If you need the original Opus, keep it rather than recreating it.
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.