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.

Do I need to install anything or create an account to use MP3 to WAV converter?

No, to all of it. MP3 to WAV converter runs inside the browser you already have, with no sign-up, no download, no watermark on the result, and no cap on how many files you convert. There is nothing to uninstall afterwards either, because nothing was installed.

Does MP3 to WAV converter work offline?

After the first conversion, yes. Audio work needs the FFmpeg engine, which is a separate download of a few tens of megabytes fetched the first time you convert something. Once your browser has cached it the work is entirely local and a connection is no longer needed.

How large a file can MP3 to WAV converter handle?

The limit is 250 MB. It is a deliberate one rather than a technical ceiling: the real constraint is memory, and a file that decodes to more than the device can hold fails in a way that is hard to explain. Phones run out well before laptops do, which is why the limit is set where it is.

Can I convert several files at once with MP3 to WAV converter?

Not here: this tool takes one file at a time, because what it does depends on choices you make about that particular file. Convert them one after another, or look at the batch converters in the same category, which are built for a folder at a time.

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.

Choose a file

.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.

No file selected.

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.

MP3 against WAV

MP3 and WAV compared, feature by feature
Feature	MP3	WAV
Compression	Lossy, discarded sound cannot return	None, every sample as recorded
Three minutes of stereo	About 3 to 7 MB	About 30 to 32 MB
Artist and album tags	Yes	No
Plays in browsers	Yes	Yes
Published	1993	1991

How to use it

Choose a .mp3 file.
Select Convert. The first conversion downloads the audio engine.
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.

Common problems

The file was refused before anything started.

MP3 to WAV converter checks the extension before it reads a byte, and it accepts .mp3. Browsers report file types inconsistently enough that the extension is what decides.

Rename the file if the extension is simply wrong, or convert it to one of those first. A file whose extension does not match its contents is refused for the same reason, and that one needs converting rather than renaming.

It said the file was too large.

The limit here is 250 MB. It is not a policy but a measurement: everything runs on your own device, and past that size a phone runs out of memory rather than finishing slowly.

Split the file, reduce it before converting, or use a desktop program for that one. A machine with more memory will manage more, but the limit does not know which machine it is on.

I selected several files and only one converted.

This tool takes one file at a time. Doing several at once would multiply the memory in use, which is the thing most likely to fail on a phone.

Convert them one after another. Nothing is kept between them, so there is no state to reset.

Nothing happened for a long time on the first run.

MP3 to WAV converter downloads a library before it can begin, and it is fetched once and then reused. That wait is before the conversion rather than during it, which is why the progress bar sits still.

Leave the tab open and in the foreground; a background tab is throttled by the browser. Every conversion after the first one in a session skips this.

The tab reloaded itself part-way through.

The browser ran out of memory and restarted the page. At sizes approaching 250 MB this is the failure a phone hits first, and it looks like a crash rather than an error.

Try a smaller file, close other tabs, or run it on a computer. Nothing was uploaded or lost — the original file is untouched on your device.

The result opened in the wrong program.

The output is a .wav file, and your system opens that extension with whatever it was told to. Nothing about the conversion decides it.

Open it from inside the program you want, or change the default for .wav in your system settings. The file itself is correct.

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.
Do I need to install anything or create an account to use MP3 to WAV converter?: No, to all of it. MP3 to WAV converter runs inside the browser you already have, with no sign-up, no download, no watermark on the result, and no cap on how many files you convert. There is nothing to uninstall afterwards either, because nothing was installed.
Does MP3 to WAV converter work offline?: After the first conversion, yes. Audio work needs the FFmpeg engine, which is a separate download of a few tens of megabytes fetched the first time you convert something. Once your browser has cached it the work is entirely local and a connection is no longer needed.
How large a file can MP3 to WAV converter handle?: The limit is 250 MB. It is a deliberate one rather than a technical ceiling: the real constraint is memory, and a file that decodes to more than the device can hold fails in a way that is hard to explain. Phones run out well before laptops do, which is why the limit is set where it is.
Can I convert several files at once with MP3 to WAV converter?: Not here: this tool takes one file at a time, because what it does depends on choices you make about that particular file. Convert them one after another, or look at the batch converters in the same category, which are built for a folder at a time.

Converter