MP3 to WAV converter
Choose MP3 or other audio files and save them as WAV. It runs in your browser and nothing is uploaded.
Free · no signup Runs in your browser
How do I convert MP3 to WAV?
Choose the MP3 (or M4A, OGG, FLAC and other formats your browser can play) and download the WAV. WAV stores every sample uncompressed, so the file is much bigger, about 10.6 MB a minute for CD-quality stereo. Converting does not improve the sound, because the detail an MP3 left out cannot be put back, but WAV is accepted by every editor and some hardware.
Why convert to WAV
WAV is the plain, uncompressed format that almost every audio editor, sampler, video editor and piece of hardware accepts. Some programs and devices will not take an MP3, or will take it only after decoding. Converting to WAV gives them what they expect and stops the file being re-compressed each time you edit and save.
Be realistic about what you gain. An MP3 has already thrown some detail away, and a WAV made from it contains exactly the sound the MP3 contained, no more. The WAV will be about seven times bigger than a 192 kbit/s MP3. Use it as a working format: edit in WAV and export to MP3 once at the end, rather than saving to MP3 repeatedly.
It runs in your browser. Your files are never uploaded, and there is no watermark or sign-up.
How it works in detail
The audio file is read on your device and decoded to samples by your browser, which can handle MP3 and other formats it can play, such as M4A, OGG and FLAC. The samples are written as 16-bit PCM in a WAV file with a 44-byte header, in stereo or mono. WAV stores every sample uncompressed, so the file is much bigger: its size is the sample rate × 2 bytes × channels × seconds, so 3 minutes of 44.1 kHz stereo is 176,400 × 180 = about 30.3 MB, and CD-quality stereo takes about 10.6 MB a minute. The sample rate is the one your browser decodes to, usually 44.1 or 48 kHz. Converting an MP3 to WAV does not bring back detail that the MP3 threw away.
How to use it
- Choose the audio file (MP3, M4A, OGG, FLAC or another format your browser can play).
- Tick 'Make it mono' if you want a smaller file.
- Wait for the conversion.
- Check the size and length shown.
- Download the WAV.
What changes and what stays the same
What the tool does to your file, and what it leaves alone.
| Aspect | What happens |
|---|---|
| Sound | Exactly as decoded; no further loss, but also no detail brought back |
| File size | Much bigger: about 10.6 MB a minute for CD-quality stereo |
| Channels | Stereo, or mono if you choose |
| Sample rate | The one your browser decodes to, usually 44.1 or 48 kHz |
| Tags and cover art | Not copied |
| Privacy | Your file is read on your device and is not uploaded; there is no account and no watermark |
When to use it
- Importing sound into an editor or hardware that needs WAV
- Editing without further compression loss
- Preparing audio for a project that asks for WAV
- Converting M4A, OGG or FLAC to a widely accepted format
Problems you may run into
Most problems come from the file itself, not from the tool.
| What you see | Likely cause | What to do |
|---|---|---|
| The WAV is huge | WAV is uncompressed | Tick mono, or keep the MP3 unless a program needs WAV |
| It does not sound better than the MP3 | The detail the MP3 discarded cannot be recovered | Convert from the original recording if you have it |
| The track names are gone | Tags are not copied | Rename the file |
| The file will not decode | The format may be protected or unsupported | Try another format or a computer browser |
| The file will not open | Your browser cannot decode this format, or the file is damaged | Try Chrome, Edge or Firefox on a computer, or open the file elsewhere to check that it plays |
| The browser slows down or stops | A very large file is processed on your own device | Close other tabs, try a computer, or use a smaller file |
Mistakes it helps you avoid
- Expecting a WAV made from an MP3 to sound better.
- Forgetting how big WAV files are: plan for 10 MB a minute.
- Converting to WAV and back to MP3 repeatedly.
- Using stereo for a mono source.
How it works
Your file is decoded and re-encoded inside your browser.
1. The audio file is read on your device and decoded to samples by your browser.2. The samples are written as 16-bit PCM in a WAV file, in stereo or mono.3. The WAV is offered as a download. Nothing is uploaded.
The WAV is written with a 44-byte header followed by 16-bit samples, as in the standard WAVE format. Its sample rate is the one your browser decodes to, usually 44.1 or 48 kHz. Size = sample rate × 2 bytes × channels × seconds, so 3 minutes of 44.1 kHz stereo is 176,400 × 180 = about 30.3 MB.
Example: a 3-minute MP3
You convert a 3-minute MP3 to a stereo WAV.
- Size44,100 × 2 × 2 × 180 = 31,752,000 bytes
- About30.3 MB
A WAV of about 30 MB
Mono halves it.
Terms on this page
- PCM
- Pulse-code modulation: the uncompressed samples stored in a WAV file.
- Sample rate
- How many samples are stored each second; 44,100 for CD quality.
Common questions
Does converting MP3 to WAV improve quality?
No. The WAV contains the sound of the MP3 as it is. The detail the MP3 left out cannot be recovered.
Why is the WAV so much bigger?
WAV is uncompressed. CD-quality stereo is about 10.6 MB a minute.
Is my file uploaded?
No. Your browser reads and converts the file on your own device. Nothing is sent over the network.
What formats can I convert?
MP3 and other formats your browser can play, such as M4A, AAC, OGG, FLAC and the sound of a video.
Can I make a mono WAV?
Yes. Tick 'Make it mono' to halve the size.
Where these numbers come from
- MDN Web Docs — BaseAudioContext.decodeAudioData() How a browser decodes an audio or video file's sound into samples.
- Library of Congress — WAVE Audio File Format The structure of a WAV file: a header and 16-bit PCM samples.
- MDN Web Docs — Web audio codec guide Which audio formats browsers can play and decode.
- MDN Web Docs — Using files from web applications How a page reads a file you choose without uploading it.
Last verified 2026-10-25 The method on this page is checked against the sources above at least once a year. Spotted something out of date? Tell us and we will fix it.
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