Converters MP3 to WAV converter
Decode MP3 files to uncompressed 16-bit WAV for editing, transcription and software that refuses compressed audio.
Drag files here, or
Converted to WAV on your device. The converter itself is a 9.8 MB download, once.
Ready. Runs locally on your device.
Your files stay on your device. The tool works directly in your browser, using your device to process your files. Nothing is sent to our servers, and we never receive, store, or see your files or figures.
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Cite this page
Reembun. (2026, August 12). MP3 to WAV converter. https://reembun.com/mp3-to-wav
How to use it
Add the MP3
Drop in one file or a batch.
Wait for the engine once
The converter downloads on the first run and is kept for next time.
Convert to WAV
WAV is uncompressed, which is what editing software and some hardware require. The file will be many times larger than the MP3.
Know what it cannot restore
Detail the MP3 discarded is gone. WAV stops further loss, it does not undo the loss that already happened.
What this conversion does and does not do
MP3 works by permanently discarding audio the ear is unlikely to notice. Once that has happened, it is gone. There is no decoder, no upscaler and no converter that can put it back.
Converting to WAV takes the compressed data and expands it into raw samples: an exact, uncompressed representation of what the MP3 sounds like. The result is a file about ten times larger that sounds precisely the same.
It cannot improve quality. Anything claiming otherwise is either mistaken or selling something.
What it does give you is a stable working format. From this point on, every save is lossless, so an edit-and-save cycle will not accumulate artefacts the way repeated MP3 saves do.
When you actually need it
- Audio editors. Audacity, Reaper, Pro Tools and Logic all prefer WAV, and some plugins refuse anything else.
- Transcription and speech recognition. A very large share of speech-to-text engines accept 16-bit PCM WAV only.
- Game engines and samplers. Unity, Unreal and most hardware samplers want uncompressed audio for predictable playback timing.
- Telephony and IVR systems, which are almost universally specified in WAV.
- Editing without generation loss. Working in WAV and exporting to MP3 once at the end is the right order of operations.
What you get
Every file comes out as 16-bit, 44.1 kHz, stereo PCM. That is CD quality, and it is the format that software asking for “a WAV” almost always means.
The original bitrate has no effect on the output size. WAV size is determined entirely by duration, sample rate and channel count:
| Source MP3 | Duration | Resulting WAV |
|---|---|---|
| 128 kbps, 3.8 MB | 4 minutes | 42 MB |
| 320 kbps, 9.6 MB | 4 minutes | 42 MB |
| 128 kbps, 57 MB | 1 hour | 635 MB |
A 128 kbps MP3 and a 320 kbps MP3 of the same track produce identically sized WAV files. The 320 one simply sounds better inside it.
Do not round-trip
MP3 to WAV and back to MP3 loses a second generation, because the encoder is now compressing audio that already carries the first encoder’s artefacts. Repeat that a few times and it becomes clearly audible.
If you need to edit, convert to WAV once, do all the editing there, and export to MP3 exactly once at the end.
Nothing is uploaded
Both sides of this conversion are large: an hour of audio becomes over half a gigabyte. That is precisely the size at which upload-based converters start charging or refusing. Here the decoding runs inside your browser tab with FFmpeg compiled to WebAssembly, so the file is read from your disk and the WAV written back to it, with no server involved and no size limit beyond your own machine.
Common questions
Does converting MP3 to WAV improve the sound?
No, and it is worth being clear about this. MP3 permanently discarded detail when it was created, and no conversion can bring it back. The WAV is a faithful, uncompressed recording of exactly what the MP3 sounds like: a much larger file that sounds the same. What it gains you is a format that will not lose anything further.
Then why convert at all?
Because a great deal of software demands it. Audio editors, DAWs, transcription engines, speech analysis tools, game engines, telephony systems and hardware samplers frequently accept WAV only. It is also the right working format if you are about to edit, because further saves will not compound compression artefacts.
How much bigger will the file be?
About ten times, and the original bitrate makes no difference to that. WAV size depends only on length, sample rate and channel count, which comes to roughly 10 MB per minute at CD quality. A 128 kbps MP3 and a 320 kbps MP3 of the same song produce WAV files of identical size.
What format is the WAV?
16-bit, 44.1 kHz, stereo PCM. That is CD quality, and it is what audio editors, transcription services and samplers expect to be handed unless they say otherwise.
Can I convert it back to MP3 afterwards?
You can, but each round trip costs another generation of quality. The WAV carries the first MP3's artefacts, and re-encoding adds a second set on top. Edit in WAV by all means, but export to MP3 once, at the end.
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