RunToolRunMP3 to WAV
Convert MP3 files to WAV format.
How to Convert MP3 to WAV
Select an MP3 file
Click the upload area or drop the .mp3 you want to convert.
Decoding in your browser
The MP3 is decoded to raw uncompressed audio and written as a WAV file on your device.
Download the WAV
Save a file ready for audio editors, DAWs and professional workflows.
Decompressing does not restore anything
WAV stores uncompressed audio samples. Converting an MP3 to WAV decodes the compressed data back into samples and writes them out exactly — which means it faithfully reproduces the MP3, including everything MP3 already discarded.
The frequencies removed during the original encoding are not in the file and cannot be recovered by any process. A 128 kbps MP3 converted to WAV sounds precisely like a 128 kbps MP3, occupying roughly ten times the space. Anyone expecting a quality improvement is going to be disappointed, and it is better to know that before converting an archive.
What the size actually is
Uncompressed CD-quality stereo audio runs at about 10 MB per minute — 44,100 samples per second, 16 bits each, two channels, with no compression whatsoever. An hour is roughly 600 MB regardless of whether the content is an orchestra or silence.
That fixed rate is a feature rather than a flaw. Because there is no compression, there is no decoding work, no codec compatibility question and no quality decision. It is the simplest possible representation of sound, and simplicity is exactly why professional tools want it.
When WAV is genuinely the right format
Audio editing is the main one. Every edit to a compressed file means decoding, changing and re-encoding, and repeating that accumulates damage. Working in WAV throughout and exporting to a compressed format once at the end keeps the intermediate steps clean.
It is also required by a lot of specific software: broadcast systems, samplers, some video editors, telephony platforms and DAWs that refuse compressed imports. And WAV can hold metadata and timing information that a straightforward MP3 workflow does not.
Doing this in the right order
If an original uncompressed recording exists anywhere, use it rather than converting the MP3. Going MP3 to WAV and back to MP3 is two generations of loss for no benefit, and the intermediate WAV does nothing to protect the audio that was already thrown away.
Conversion runs through FFmpeg compiled to WebAssembly in your browser, so recordings of interviews, meetings and private material are processed locally. Bear the size in mind before starting: a long recording produces a very large file, and browsers hold that in memory while writing it.
Sample rate, bit depth and channels
A WAV is defined by three numbers: how many samples per second, how many bits per sample, and how many channels. CD quality is 44,100 Hz, 16-bit, stereo. Decoding an MP3 produces samples at whatever rate the MP3 used, and writing them at a higher rate does not add information — it interpolates, exactly as enlarging an image does.
Match the output to what the destination software actually requires rather than to the largest numbers available. A telephony system may want 8,000 Hz mono and a DAW may want 48,000 Hz to match a video project. Converting to the wrong rate means the receiving software resamples again, which is one more unnecessary step in a chain that already lost what it lost at the MP3 stage.