Decode the MP3
The browser's MP3 decoder produces PCM samples. The source bitrate, sample rate and channel count are shown before conversion.
Browser tool · nothing uploaded
MP3 to WAV, without pretending the detail comes back.
Drop an MP3 and get a PCM WAV for a DAW, a sampler or an older device. The audio is decoded and re-wrapped locally; the file is never uploaded.
.mp3 → .wav16-bit PCM or 32-bit floatNo uploadDAW ready
WAV converter local
ready nothing uploaded
Output settings
Optional. Use mm:ss or h:mm:ss. Batch conversion uses the full file.
Converting… 0%
The WAV was written in this tab. The MP3 was not uploaded.
01
What this converter does
mp3towav.net converts MP3 audio to WAV in the browser; the file is never uploaded.
The MP3 is read from your disk, decoded to PCM samples, and written into a WAV container. The output is written in this tab and offered as a download. There is no upload endpoint, no account and no queue.
If you need the reverse direction, or a different source format, this page is deliberately single-purpose. The how-it-works page explains the engine, the browser requirements and the cases where the converter will refuse a file rather than write a broken one.
02
How it works
Choose a WAV format
16-bit PCM is the compatibility default. 32-bit float is for further editing and is twice the size; it does not add detail to a lossy source.
Write the WAV
The samples are written into a RIFF/WAVE container in this tab. No server sees the audio, and the output is a normal PCM file a DAW can open.
03
What changes in the file
| Property | Result | Notes |
|---|---|---|
| Source | MP3 CBR/VBR | Decoded to PCM by the browser. |
| Output | 16-bit PCM or 32-bit float WAV | Both are standard RIFF/WAVE. |
| Sample rate | Source, or 44.1/48 kHz | No rate is invented. |
| Size | ~10.1 MiB/min at 44.1/16 stereo | A WAV is roughly ten times the MP3. |
| Quality | Unchanged | Detail is not restored. |
| Metadata | Basic tags may carry | Chapters and cover art are not guaranteed. |
| Limit | 4 GiB RIFF | RF64 warning before a larger file. |
A WAV is not a remaster
If the MP3 already sounds flat, a WAV will sound the same. WAV is a better editing format, not a better-sounding copy.
04
Guides for this format
Guide
MP3 to WAV quality
WAV is lossless, but a WAV made from an MP3 is not. Here is what the conversion actually does, when it helps, and when it is a waste of disk.
GuideAudacity MP3 to WAV
How Audacity handles an MP3 import and a WAV export, what sample rate and bit depth to choose, and when the browser is enough.
GuideMP3 encoder delay and WAV length
MP3 frames, encoder delay, decoder delay and gapless tags. What the extra milliseconds are, what our test measured, and when it matters.
GuideWAV file size
How large a WAV really is at 16-bit, 24-bit and 32-bit float, why a 2-hour file can pass 1 GB, and when RF64 is needed.
05
Questions
Does MP3 to WAV improve quality?
No. MP3 is lossy; converting to WAV re-wraps the decoded samples. It cannot restore detail the MP3 encoder discarded. A WAV made from an MP3 sounds the same as the MP3.
Why convert to WAV then?
For editing, DAW import, samplers, CD authoring and devices that only accept PCM. It is about compatibility and sample-accurate editing, not a quality upgrade.
16-bit or 32-bit float?
16-bit is the safe default and half the size. 32-bit float is useful while editing because it keeps headroom; it does not add detail that the MP3 never had.
Will the WAV be huge?
Yes. At 44.1 kHz, 16-bit stereo it is about 10.1 MiB per minute. A file approaching 4 GiB needs RF64, and the page warns before writing one.
Does it fix encoder delay?
It preserves the decoded samples; it does not invent a sample-accurate alignment the MP3 never had. For critical sync, use the original WAV or a lossless master.
Are my files uploaded?
No. The MP3 is read from disk and processed in this tab. There is no upload endpoint.
06
Limits, stated up front
- No upload limit, but a memory limit. The file is read lazily from disk; the output still has to fit in the tab. Very large files can exhaust a phone or a low-memory laptop.
- MP3 is lossy. The converter never claims otherwise. It re-encodes the audio; choose a bitrate at or above the source to avoid stacking more loss than necessary.
- Not every codec is supported. The browser must be able to decode the audio track. ALAC, AC-3, DTS, WMA, AMR and DRM-protected files are rejected with a clear message.
- No URL input. The file must be on your device. The tool does not fetch from streaming services or bypass DRM.
The full support matrix and browser requirements are on how it works. Privacy details are on privacy.