How do I convert MP3 to WAV?

Converting MP3 to WAV decodes the compressed audio back into uncompressed PCM. Be clear about what this does and doesn't do: the WAV will contain exactly the audio that was in the MP3 — no more. Detail discarded during the original MP3 encoding is gone permanently; the conversion cannot restore it. What you gain is a format, not fidelity. See MP3 vs WAV explained.

So why do it? Compatibility with tools and workflows that demand PCM. CD burning requires 16-bit/44.1 kHz WAV. Many samplers, DJ tools, broadcast cart systems, and older editing suites only accept WAV. Some DAW workflows prefer WAV because decoding happens once at import rather than repeatedly during playback, and because edits/exports from a WAV avoid triggering extra lossy re-encodes down the chain.

The standard output is 16-bit/44.1 kHz stereo — CD spec, and the right choice for burning discs or general editing. Choose 48 kHz if the WAV is headed into a video project, since video timelines run at 48 kHz. The file will be much larger than the MP3: a 4 MB, 128 kbps MP3 becomes roughly a 40 MB WAV, the fixed cost of uncompressed PCM at 1,411 kbps.

Reasons to convert MP3 to WAV usually come down to compatibility, file-size, or specific feature requirements. Common situations:

• An app or platform only accepts WAV uploads.
• You need a feature unique to WAV (e.g. lossless editing, chapter markers, smaller streaming size, etc.) that MP3 doesn't provide.
• You're optimising file size — modern formats often produce smaller files than the older format you started with.
• You need a single archival format across a project so files behave consistently in the same viewer.

1. Open the MP3 → WAV tool on mp3.now.
2. Drag your MP3 file onto the drop zone, or click Select files. You can drop a whole folder of files at once.
3. The output is fixed to WAV. If the format supports extra options (bitrate, sample rate, channels, volume normalization), tweak them in the options panel.
4. Click Convert. The job runs on our server and finishes in a few seconds for typical tracks.
5. Download the result. Files stay in storage for 24 hours and are then permanently deleted.

The entire flow is free for the first 10 jobs per day with no signup required. A free account doubles that quota; a premium plan removes the limit entirely.

• The WAV cannot sound better than the source MP3 — this conversion changes the format, not the quality.
• Burning an audio CD? Use 16-bit/44.1 kHz stereo — the Red Book CD standard.
• Audio for a video edit? Choose 48 kHz to match video timelines.
• Edit in WAV, save your working files as WAV, and re-encode to MP3 only once at the very end.
• Expect ~10× size growth: a 4 MB MP3 becomes a ~40 MB WAV.