MP3 to WAV and WAV to MP3: how to convert, and which to pick

Convert MP3 to WAV or WAV to MP3 in your browser. What each direction really does to quality, file size per minute, Android steps and common fixes.

Updated October 31, 2026

Short answer: to convert MP3 to WAV, open MP3 to WAV, drop the file, leave the quality on 16-bit and download the WAV. To go the other way, use WAV to MP3 and keep the default 192 kbps. Both run inside your browser, free and without uploading anything. One thing to know first: turning an MP3 into a WAV does not bring back lost quality. You get a file about seven times bigger that sounds exactly the same, which is only worth it when an app or a submission form insists on WAV.

How to convert MP3 to WAV (or WAV to MP3) on Nibbo

Both pages use the same converter. Only the starting format differs.

1. Open MP3 to WAV or WAV to MP3.
2. Drop your files onto the Drop MP3 files (or Drop WAV files) box, or click it to choose. You can add many at once.
3. Under Save as, check that WAV (or MP3) is selected. The converter remembers the last format you clicked, so switch it back if you used another one before.
4. Pick a Quality:
   • for WAV: 16-bit (the default), 24-bit or 32-bit float;
   • for MP3: 320, 256, 192 (the default), 128 or 64 kbps, or VBR V0 / V2.
5. Leave Channels on As source, or force Stereo or Mono.
6. Click Convert to WAV (or Convert to MP3; with several files, Convert 5 files to MP3). For MP3 the LAME encoder downloads once, about 130 KB.
7. Each file shows its length, original size and new size, with a player to check it. Click Download, or Download all (ZIP) when you converted more than one.

Files are processed one after another, so you can queue a whole folder and leave it. Nothing is uploaded: the decoding and encoding happen in your browser tab, and once the page has loaded it keeps working offline.

MP3 to WAV does not improve quality

MP3 is lossy. When the MP3 was made, the encoder threw away detail for good. Converting it to WAV decodes what is left and stores it uncompressed: same sound, much bigger file. A 128 kbps MP3 turned into a 24-bit WAV is still a 128 kbps MP3 underneath, and an expert can tell by looking at the spectrum, which stops at the same cutoff the MP3 had.

So why do it at all? Because some software and some people simply require WAV:

• Audio editors and DAWs that import WAV faster or edit it without re-decoding every time.
• DJ and karaoke software or hardware players that only list WAV.
• Phone systems (on-hold music, voicemail greetings) and PA systems.
• School, radio and contest submissions whose rules say “WAV only”.
• Burning an audio CD with software that expects WAV.

If nobody is asking you for WAV, keep the MP3.

Which WAV bit depth to choose

• 16-bit is what a CD uses and is plenty for anything that came from an MP3. Nibbo adds a tiny amount of dither when writing 16-bit, which keeps quiet fades clean.
• 24-bit is 50% bigger. Choose it if your editor or a submission asks for 24-bit; it won’t sound better from an MP3 source.
• 32-bit float is twice the size of 16-bit. It’s useful for one specific case: loud, modern MP3s often decode with peaks slightly above full scale. 16- and 24-bit WAV have to cut those peaks off; 32-bit float keeps them, so you can lower the volume in your editor without any clipping. Not every app or device plays float WAV, so only use it for editing.

Sample rate: Nibbo keeps the rate of the source. An MP3 at 44.1 kHz becomes a 44.1 kHz WAV, a 48 kHz one stays 48 kHz. There is no option to change it, so if a phone system demands 8 kHz WAV, that system’s own tools will have to resample.

WAV to MP3: what to pick

Here the quality loss is real, but at 192 kbps you’re very unlikely to hear it in normal listening.

• 192 kbps (default): music, recordings of rehearsals and concerts, anything you’ll listen to.
• 320 kbps: when a platform or a DJ asks for “320”.
• 128 kbps: background music, playback on phone speakers.
• 64 kbps (voice): lectures, interviews, meetings. Set Channels to Mono too.
• VBR V0 / V2: music, with bits spent only where the sound needs them.

Things to know about the MP3 you get:

• High sample rates are lowered, because MP3 stops at 48 kHz. A 96 kHz studio WAV becomes 48 kHz, an 88.2 kHz one becomes 44.1 kHz. 44.1 and 48 kHz files are left as they are.
• 24-bit and 32-bit float WAVs are read fine; the extra resolution simply isn’t stored in an MP3.
• More than two channels (a 5.1 or multitrack WAV) are mixed down to stereo.
• No tags are written: no title, artist or cover art, and any notes stored in the WAV are not carried over. Add them afterwards with any ID3 tag editor.

File size: WAV vs MP3 per minute

Uncompressed WAV size is simple math: sample rate × bytes per sample × channels × seconds. A CD-quality WAV (44.1 kHz, 16-bit, stereo) is 176,400 bytes per second, or about 10.6 MB per minute. An MP3 is bitrate ÷ 8 × seconds: at 192 kbps, about 1.4 MB per minute.

That’s why a 5 MB MP3 turns into a 40 MB WAV, and why a WAV you recorded is often too big to email until you convert it to MP3.

MP3 to WAV on Android

1. Open MP3 to WAV in Chrome (or any modern browser).
2. Tap the drop box. Android opens its file picker: choose Audio, Downloads or browse to the folder with your MP3. Long-press to select several.
3. Check that WAV and 16-bit are selected and tap Convert to WAV.
4. Tap Download. The WAV is saved in Downloads, where your editor, DJ app or file manager can find it.

No app to install. Keep the screen on and the tab in front while it converts: Android may pause a background tab. On iPhone, the same steps work in Safari, and the file lands in Files → Downloads. On Windows and Mac, drag files straight from File Explorer or Finder.

Common errors and fixes

• The WAV is much bigger than the MP3. That’s expected, not a bug: see the table above.
• The WAV doesn’t sound better. Also expected. Nothing can restore what the MP3 encoder removed.
• Your app won’t open the WAV. If you chose 32-bit float, convert again at 16-bit. Some players and older hardware only understand integer PCM.
• “The audio engine ran out of memory.” The whole recording is decoded into memory first, and an hour of stereo audio takes over 1 GB while it’s being processed. Use a computer, close other tabs, or split long recordings with Cut audio.
• It shows “Loading the universal decoder…”. Normal for formats the browser can’t read on its own, such as some WAVs from old voice recorders. It loads once and then continues.

FAQ

Is MP3 or WAV better?

WAV is better as a master: it’s lossless, so you can edit and re-export it without losing anything. MP3 is better for listening and sharing, because it’s around a seventh of the size at 192 kbps. Record and edit in WAV, share in MP3.

Can I convert MP3 to WAV without losing quality?

Yes, in the sense that the WAV keeps everything the MP3 had. But it can’t add back what the MP3 already lost.

Will converting WAV to MP3 and back to WAV give me the original?

No. The round trip leaves you with a big WAV that sounds like the MP3. Keep your original WAV files.

My WAV is too quiet. Can I fix it while converting?

Use Normalize audio: it measures loudness in LUFS, brings the file to a target such as podcast or streaming level, and saves as MP3 or WAV.

Are my files uploaded?

No. Everything happens on your device. You can check with the airplane-mode test. For video, see how to convert MP4 to MP3.