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WAV to MP3Free online audio decoder
MP3 to WAV, decoded on your device
Turn compressed MP3 audio back into uncompressed WAV — 16-bit, 24-bit or 32-bit float PCM — entirely inside your browser. Nothing is uploaded, nothing is installed, and the batch runs as fast as your CPU.
WAV is what audio editors, DAWs and CD burners want: uncompressed PCM that survives repeated edits and re-exports without stacking new compression artefacts.
- Free forever
- No upload
- No account
- Up to 25 files
- 16/24/32-bit output
Drag MP3 files here — they decode to WAV on this device
.mp3 up to 100 MB each, 25 files per batch — nothing is uploaded
How to convert MP3 to WAV
Three steps, all on your own device — no account and no upload queue.
Add MP3 files
Drag up to 25 .mp3 files (100 MB each) into the drop zone, or press “Pick MP3 files” to browse your device. Decoding starts as soon as a file lands.
Choose the WAV bit depth
16-bit is the default — it matches the CD standard and opens anywhere. Pick 24-bit when the WAV is heading into a mix that will get more processing, or 32-bit float when your DAW works in float and you want headroom above 0 dBFS preserved.
Download your WAV files
Each finished file shows its MP3 size, the resulting WAV size and the length of the audio. Save them one at a time or press “Download all” for the whole batch.
Technical specifications
| Input format | MP3 (MPEG-1/2/2.5 Layer III), constant or variable bitrate |
|---|---|
| Output format | WAV (RIFF) — 16-bit or 24-bit integer PCM, or 32-bit IEEE float |
| Sample rates | Preserved from the source: 8–48 kHz, read from the MP3 frame header |
| Channels | Mono stays mono, stereo stays stereo |
| Batch limit | 25 files per batch, 100 MB per file |
| Typical size change | 4–11x larger, set by length and bit depth: 3 minutes of 44.1 kHz stereo is ~32 MB at 16-bit |
| Processing location | 100% on your device — browser decoder plus a Web Worker, no upload |
| Price | Free — no account, no watermark, no daily quota |
| Works offline | Yes, once the page has loaded |
What MP3 to WAV can and cannot do
This is the honest part that most converters skip. MP3 encoding throws audio data away permanently — high frequencies, quiet detail masked by louder sounds — and decoding to WAV cannot reconstruct any of it. A WAV made from a 128 kbps MP3 still sounds like a 128 kbps MP3; it just takes about eleven times the disk space.
What the conversion genuinely buys you is stability. Every time you re-save an MP3 after editing, it gets re-encoded and loses a little more. Decode it to WAV once, and all the trimming, EQ, normalising and time-stretching that follows happens on uncompressed samples. You then encode back to MP3 exactly once, at the end — which is the workflow every audio engineer uses.
It also buys compatibility. Audio CDs store PCM, not MP3. Hardware samplers, telephony systems, game engines, transcription tools and plenty of older software read WAV and nothing else. Decoding first is not optional there.
Frequently asked questions
How do I convert MP3 to WAV online for free?
Drop your MP3 on this page and download the WAV — there is nothing else to it. The decoding runs inside your browser tab, so there is no account to create, no software to install and no upload queue to wait for.
Does converting MP3 to WAV improve the audio quality?
No. MP3 compression permanently discards audio data, and no conversion can bring it back. What a WAV gives you is an uncompressed container: the audio stops degrading with every further edit and re-export, and every editor, DAW and CD burner can read it natively. Think of it as freezing the quality you have, not restoring the quality you lost.
Why would I convert MP3 to WAV at all?
Four common reasons: editing (audio editors and DAWs handle uncompressed PCM without re-encoding artefacts on every save), CD burning (audio CDs need PCM, so an MP3 has to be decoded first anyway), older or embedded hardware and software that only accepts WAV, and sampling — chopping and time-stretching is cleaner on uncompressed audio.
How much bigger does the file get?
Between about 4x and 11x, depending on the MP3's bitrate — because the WAV size depends only on length, sample rate and bit depth, never on the source bitrate. Three minutes of 44.1 kHz stereo audio is always about 32 MB as a 16-bit WAV, 48 MB at 24-bit and 64 MB at 32-bit float. As a 320 kbps MP3 those same 3 minutes are roughly 7 MB (4.5x smaller); at 128 kbps under 3 MB (11x smaller).
Which bit depth should I choose?
16-bit for maximum compatibility and the smallest WAV — it is the CD standard and what most software expects. 24-bit if the file is going into further mixing or mastering, so processing has more room before rounding becomes audible. 32-bit float if your DAW is float-based and you want peaks above 0 dBFS to survive intact.
Do my MP3 files get uploaded to a server?
No. The MP3 is decoded by your browser's own audio decoder and the WAV file is assembled in a Web Worker on your device. Nothing is transmitted, which is also why a 100 MB file needs no upload time at all.
Is the original sample rate and channel count preserved?
Yes. The converter reads the sample rate and channel mode from the MP3's frame header and writes the WAV at the same rate — 44.1 kHz stays 44.1 kHz, a 32 kHz podcast stays 32 kHz, and mono stays mono instead of being padded into a stereo file twice the size.
Can I convert several MP3 files to WAV at once?
Yes — up to 25 files per batch. They decode one after another with a live progress bar, and a single “Download all” button saves every finished WAV. Files are capped at 100 MB each because decoding needs roughly ten times the MP3's size in memory, and the WAV output is allocated on top of that.
Finished editing? Compress it back
Once your WAV is mixed and exported, the WAV to MP3 converter encodes it at up to 320 kbps in the same browser tab — a 30 MB WAV comes out around 7 MB. Details on how both directions work are in about this converter.
Your files stay on your device
The MP3 goes into your browser's own audio decoder, the PCM samples go into a Web Worker that writes the RIFF header and sample data, and the finished WAV comes back as a normal download. No step involves a server, so there is nothing to store, scan or leak — and the page keeps working if you go offline after it loads.