Convert MP3 to WAV, right in your browser
Drop in an MP3 and get an uncompressed WAV back in a couple of seconds. Your files stay on your device the whole time, because the conversion never leaves this page.
Starting the converter. It needs JavaScript, because JavaScript is what does the conversion here instead of a server.
- Nothing is uploaded. The audio is decoded and rewritten on your own machine.
- No sign-up, no cap. Convert one file or forty, as often as you like.
- Real settings. 16, 24, or 32-bit float, and the source sample rate is kept unless you change it.
- Batch friendly. Queue a folder, then download everything as one ZIP.
How to convert an MP3 to WAV
- Add your MP3 files. Use the button above, or drag files straight onto the dotted box. Selecting a whole folder of tracks works too.
- Change the settings only if you need to. The defaults give you a 16-bit WAV at the same sample rate as the original, which is what most software expects. Open Output settings if you need 24-bit, mono, or a specific rate such as 48 kHz.
- Download. Each file gets a Download WAV button as it finishes, plus a small player so you can check it before saving. Converted more than one? Use Download all as ZIP.
Which settings actually matter
Most people should change nothing. The two settings worth understanding are bit depth and sample rate, and the honest answer for an MP3 source is that the defaults are already right.
| Setting | Pick this | Why |
|---|---|---|
| Bit depth | 16-bit | The CD standard, and more than an MP3 can fill. Choose 24-bit only when a studio asks for it. |
| Bit depth, special case | 32-bit float | Peaks louder than 0 dBFS survive instead of clipping. Useful if you are about to process the file heavily. |
| Sample rate | Same as source | Resampling is an extra step that can only lose accuracy. Change it when an app demands 48 kHz for video. |
| Channels | Same as source | Mono halves the file size and suits speech. It will flatten a stereo mix, so leave music alone. |
We read the sample rate out of the MP3 frame header before decoding, so a 48 kHz MP3 comes back as a 48 kHz WAV. A lot of browser converters skip that step and quietly resample everything to whatever the sound card runs at, usually 44.1 kHz.
Converting will not make the audio better
This is worth saying plainly, because plenty of pages imply otherwise. An MP3 encoder throws away audio it judges you will not miss, and that decision is permanent. Wrapping the result in a WAV container gives you a bigger file containing the same sound.
So why convert at all? Usually because something refuses to cooperate with MP3:
- A DAW such as Pro Tools, Ableton, Logic, Reaper, or FL Studio behaves better with uncompressed audio, and some refuse MP3 import entirely.
- DJ software including Serato, Traktor, and Rekordbox analyses WAV faster and holds tighter timing.
- Burning an audio CD needs 44.1 kHz 16-bit PCM, which is exactly what a standard WAV holds.
- Video editors, game engines, and phone systems often accept WAV and nothing else.
- Editing repeatedly in MP3 re-compresses the file every save, so each round adds damage. WAV does not.
Read the full explanation of why quality cannot come back, including what happens if you convert back to MP3 afterwards.
How big will the WAV be?
WAV size depends only on length, sample rate, bit depth, and channel count. The bitrate of the original MP3 has no effect at all. One minute of stereo audio works out like this:
| Format | Per minute | A 4 minute song |
|---|---|---|
| 44.1 kHz, 16-bit, stereo | 10.1 MB | 40.4 MB |
| 44.1 kHz, 24-bit, stereo | 15.1 MB | 60.6 MB |
| 48 kHz, 16-bit, stereo | 11.0 MB | 44.0 MB |
| 44.1 kHz, 16-bit, mono | 5.0 MB | 20.2 MB |
| MP3 at 320 kbps, for comparison | 2.3 MB | 9.2 MB |
Work out any combination with the WAV file size calculator, or read what bit depth and sample rate actually change.
What happens when you press convert
Nothing exotic, and no server. Your browser already ships with an MP3 decoder because it needs one to play audio on the web, and this page borrows it.
- The file is read from disk into memory. It never touches the network.
- We scan the MP3 frame header for the real sample rate, skipping any ID3 tag at the front.
- The Web Audio API decodes the MP3 into raw samples at that rate.
- A background worker writes those samples into a standard RIFF/WAVE file, so the page stays responsive while it runs.
- The finished WAV is handed to you as a download that was created locally.
Sample values are clamped before they are written, so a loud master cannot wrap around into distortion. If you choose 32-bit float we deliberately leave them unclamped, since surviving peaks above full scale is the whole reason to use float.
Browsers this works in
Chrome, Edge, Firefox, Safari, Opera, Brave, and Samsung Internet, on desktop and mobile, from roughly 2021 onward. The page needs the Web Audio API and Web Workers, both of which have been standard for years. If your browser is missing them the converter says so instead of failing silently.
Questions people actually ask
Is this MP3 to WAV converter free?
Yes, and there is no catch to explain. No account, no email, no watermark, no daily cap, and no queue you can pay to skip. The conversion runs on your own computer, so it costs us nothing to let you convert a hundred files.
Do my files get uploaded anywhere?
No. Your browser reads the MP3 from disk, decodes it, and writes the WAV back out on the same machine. Nothing is sent to a server, which you can verify: open your browser developer tools, switch to the Network tab, and convert a file. You will see no upload request. You can also disconnect from the internet after the page loads and the converter still works.
Does converting MP3 to WAV improve the sound quality?
No. MP3 encoding permanently discards part of the audio, and nothing can put it back. The WAV you get sounds exactly like the MP3 you started with, only larger. Converting is still worth doing when software you use refuses to read MP3, or when you want to edit without stacking up more compression damage. Longer answer here.
Can I convert several MP3 files at once?
Yes. Select or drop as many as you like. They convert one after another so your browser does not run out of memory, and once at least two are finished you can grab them all in a single ZIP.
Which bit depth should I pick?
16-bit unless something specific tells you otherwise. An MP3 does not contain enough detail to fill 24 bits, so the larger file gains you nothing on its own. Pick 24-bit when a studio or client asks for it, and 32-bit float when you plan to process the audio hard and want peaks above 0 dBFS to survive.
Why is the WAV so much bigger than the MP3?
Because WAV stores every sample as a raw number and MP3 compresses. A 4 minute track at 128 kbps is about 3.8 MB as an MP3 and about 40 MB as a 44.1 kHz 16-bit stereo WAV. That roughly eleven times jump is normal and is the price of an uncompressed file.
Does it work on a phone?
It works in Chrome and Safari on Android and iOS. Phones have tighter memory limits than laptops, so very long files can fail where a desktop would cope. If a big file stops partway, convert to mono or use a lower sample rate.
Is there a file size limit?
Each file can be up to 250 MB going in. The real limit is the WAV coming out, since a browser tab can only hold so much: the converter stops and tells you if the result would exceed roughly 1.8 GB. For reference, 250 MB of 320 kbps MP3 is about ten hours of audio.