MP3 to WAV Converter
Processed locally in your browser — nothing is uploaded.
Quick answer
Converting MP3 to WAV unpacks the compressed audio into uncompressed PCM — the raw format editing suites, DAWs and mastering tools expect. It makes the file large and editable, but it does not restore quality the MP3 already discarded. This tool decodes in your browser with ffmpeg.wasm and uploads nothing. The engine is a one-time ~10 MB download on first use, then every conversion runs locally.
How to mp3 to wav converter
Add your MP3 file
Drop an .mp3 file onto the drop zone. The tool decodes the compressed audio, ready to write out as PCM.
Convert to WAV
The MP3 is decoded to uncompressed PCM at its original sample rate. There is no bitrate to set — WAV is uncompressed.
Download the WAV
You get a standard .wav file, larger than the MP3 but in the raw format editors and DAWs work with best.
Why convert MP3 to WAV?
You go from a compressed format to an uncompressed one when a tool needs raw audio to work with. WAV is the lingua franca of audio production: it is what DAWs, samplers, mastering chains and many plugins load fastest and most reliably. Decoding an MP3 to WAV gives those tools uncompressed PCM they can process without repeatedly unpacking a compressed stream. Common reasons include:
- Importing into a DAW or editor that prefers — or requires — WAV.
- Loading a sample into hardware or software that reads PCM only.
- Preparing audio for mastering, where you want no lossy stage in the chain.
- Feeding a tool or SDK whose input format is uncompressed WAV.
How much bigger will the WAV be?
Substantially. WAV stores every sample in full at a constant ~1,411 kbps for CD-quality stereo, no matter what bitrate the MP3 used. So a heavily compressed MP3 expands the most:
| Source MP3 bitrate | MP3 size / min | WAV size / min | Growth |
|---|---|---|---|
| 128 kbps | ≈ 0.95 MB | ≈ 10 MB | ≈ 10× |
| 192 kbps | ≈ 1.4 MB | ≈ 10 MB | ≈ 7× |
| 320 kbps | ≈ 2.4 MB | ≈ 10 MB | ≈ 4× |
Notice the WAV size is the same in every row — it depends on the sample rate and bit depth, not on the MP3’s bitrate. The lower the MP3 bitrate, the more dramatic the apparent "growth", even though no quality is being added.
The right place for MP3-to-WAV in a workflow
Use it as a *format adapter*, not a quality step. Decode the MP3 to WAV so your editor can load it, do your editing, then export to whatever final format you need. If you have the choice, though, always start editing from a lossless source (the original WAV or FLAC) rather than an MP3 — the WAV made from an MP3 carries the MP3’s compression artefacts with it.
Need raw audio out of a video?
If your source is a video rather than an MP3, extract the audio from a video first; you can then convert that to WAV here for editing. Working from the video’s own audio avoids adding an extra MP3 stage.
Is my MP3 uploaded to convert it?
No. Decoding runs through ffmpeg.wasm in your browser tab: the MP3 is unpacked to PCM on your device and written out as a WAV locally, with no server involved. Confirm it in DevTools → Network — after the one-time engine download, converting a file uploads nothing.
Related audio tools
Once you are done editing and want to compress again, WAV to MP3 re-encodes at the bitrate you choose, or WAV to FLAC archives losslessly. To trim a clip before or after converting, use the trim audio tool.
Your files never leave your device
Processed locally in your browser — nothing is uploaded. You can verify it yourself: open your browser’s developer tools, watch the Network tab, and use the tool — no upload request is ever made.
Frequently asked questions
Does converting MP3 to WAV improve the quality?
No. It cannot restore anything MP3 compression discarded. The WAV is an uncompressed copy of the already-degraded audio — larger, but no better-sounding than the MP3.
Why would I want a bigger file?
Because uncompressed WAV is what editors, DAWs, samplers and mastering tools work with best. The size is the cost of having raw, directly editable PCM audio.
How big will the WAV be?
About 10 MB per minute of CD-quality stereo, regardless of the MP3’s bitrate. A 3-minute song becomes roughly 30 MB as WAV.
Does the sample rate change?
No. The WAV keeps the MP3’s sample rate (commonly 44.1 kHz), so pitch and playback speed are unchanged. Only the encoding changes from compressed to raw PCM.
Should I edit audio from an MP3-derived WAV?
Only if you have no lossless original. A WAV made from an MP3 still contains the MP3’s compression artefacts. When possible, edit from the original WAV or FLAC instead.
Can I convert the WAV back to MP3 afterwards?
Yes, but re-encoding to MP3 compresses lossily again, adding a second round of loss. Keep edits minimal or work from a lossless source to avoid stacking losses.
Is my audio uploaded during conversion?
No. Everything runs locally in your browser via ffmpeg.wasm. You can verify there is no upload in the DevTools Network tab.