MP3 to PCM
Decode MP3 to Raw Uncompressed Audio
Need to use MP3 to PCM right now?
Doesn't restore quality already lost in the original MP3 encoding — it avoids further loss from here.
Drop an audio file, or click to browse
Processed locally in your browser — never uploaded
Decodes MP3 to uncompressed 16-bit PCM WAV — useful for editing software that expects lossless input, at the cost of a much larger file.
Features
- Runs entirely in your browser
- Privacy-first — your data is never uploaded
- Real-time, instant results
- 100% free, no sign-up required
- Works on desktop, tablet, and mobile
- No installation needed
Who uses this tool?
About MP3 to PCM
Some audio editing software, voice analysis tools, and professional workflows specifically expect uncompressed WAV input rather than a compressed format like MP3. This tool decodes an MP3 file and re-exports it as standard 16-bit PCM WAV, entirely inside your browser.
A real FFmpeg build compiled to WebAssembly performs the decode-and-re-encode locally, with no upload involved at any point — the MP3's compressed audio data is fully decoded back to raw PCM samples and written out in WAV's uncompressed format.
It's worth understanding what this conversion can and can't do: MP3 is lossy, meaning some audio detail was permanently discarded when the file was originally encoded to MP3. Converting to WAV doesn't restore that lost detail — it simply avoids introducing any further compression loss from this point forward, since WAV itself applies no additional lossy processing.
The resulting WAV file will be substantially larger than the source MP3, since uncompressed audio takes up far more space than compressed — this size increase is expected and inherent to the format, not a sign anything went wrong.
How it works
- Upload your MP3 file. The file loads into the browser-based FFmpeg engine.
- Conversion runs locally. The MP3 is decoded and re-encoded as uncompressed WAV.
- Download the WAV. Lossless 16-bit PCM, ready for further processing.
Examples
Preparing an MP3 for lossless editing
Input
song.mp3
Output
song.wav, uncompressed and ready for an editor