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Free File Converter

MP3 to WAV converter

Decode an MP3 to uncompressed WAV for editing or mastering.

Processed in your browser. This file is converted on your device and is never uploaded.

Converter

.mp3 up to 250 MB. You can also drag a file here.

Options

The first conversion downloads a 32 MB audio engine, which is then reused while this page stays open. Conversion runs on your device and is much slower than a desktop program: expect roughly real time for a long recording, and considerably slower on a phone.

The engine is ffmpeg.wasm, an unmodified build of FFmpeg licensed under the GPL, version 2 or later. It is served from this site's own asset domain, because it is too large for the limit our host places on a single file. It receives nothing about your file: it is a program your browser downloads and then runs on your device.

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About this tool

Audio editing software, transcription tools, and some hardware samplers refuse anything but uncompressed audio. This tool decodes an MP3 into a 16-bit WAV in your browser, ready to be imported.

Nothing is uploaded, which matters for interviews, recordings of meetings, and anything else you would rather not hand to a stranger's server.

Supported formats and limits

Input
.mp3
Output
.wav (audio/wav)
Output name
The original name with the new extension, for example data.mp3 becomes data.wav.
File size limit
250 MB
Processing
In your browser. The file is not uploaded.

How to use it

  1. Choose a .mp3 file.
  2. Select Convert. The first conversion downloads the audio engine.
  3. Download the .wav file.

Limitations

  • Decoding to WAV does not restore quality. The detail MP3 discarded is gone; the result is simply an uncompressed copy of what remains.
  • WAV files are large, roughly ten times the size of the MP3 they came from.
  • The output is 16-bit PCM at the source's sample rate. Choosing a different bit depth or sample rate is not supported.
  • Tags and cover art are not preserved.
  • The first conversion downloads a 32 MB engine, and conversion is slower than a desktop program.

Frequently asked questions

Is my file uploaded?
No. The conversion runs entirely in your browser. The only network request is for the conversion engine, which carries nothing about your file.
Will this improve the quality?
No, and nothing can. MP3 compression is lossy and permanent. Converting to WAV gives you an uncompressed file, not a better-sounding one.
Why is the file so much bigger?
WAV stores every sample uncompressed. A minute of CD-quality stereo audio is about 10 MB regardless of how simple the sound is.
What bit depth do I get?
16-bit PCM, which is what audio software expects and what CDs use.

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