MP3 to WAV Converter
Convert an MP3 to WAV in your browser. WAV is the standard for audio editing software, broadcast systems, and anything that needs uncompressed PCM. Useful when you're feeding an MP3 into Audacity, a DAW, transcription software, or any tool that wants WAV input. No upload required.
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Stays on your device
Your audio is decoded into your browser's memory by the Web Audio API, re-encoded by a JavaScript library running in the same tab, and the result goes straight to your downloads. No upload, no log, no third party. Sensitive recordings, voice memos, copyrighted tracks — none of it leaves your machine.
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MP3 → WAV done right
Honest note: converting MP3 to WAV doesn't recover quality lost during MP3 encoding. The WAV will be much bigger (roughly 7-10×) but won't sound any better than the source MP3. The point is compatibility, not quality.
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Quality control
WAV output is uncompressed 16-bit PCM at the source's sample rate. No quality is added or removed during encoding — the WAV contains exactly what your MP3 decoded into.
Frequently asked questions
Does my audio ever leave my device?
No. The conversion runs entirely in your browser. We decode your file using the Web Audio API and re-encode it using a JavaScript encoder library, all in your browser tab. Open DevTools while you convert — you'll see zero traffic carrying your audio.
Is there a file size limit?
No fixed limit from us. The real ceiling is your device's memory: decoded audio sits in RAM as raw PCM, which is roughly 10 MB per minute of stereo audio at 44.1 kHz. A typical 5-minute song needs about 50 MB of working memory — fine on any modern phone or laptop. Hour-long podcasts may struggle on older devices.
Will the conversion change the audio quality?
MP3 is a lossy format, so encoding to MP3 always involves some quality loss compared to the source. At 192 kbps (our default), the difference is inaudible to most listeners on most playback hardware. WAV is lossless — if you're converting TO WAV, the output is bit-identical to what your source decoded into. If you're converting FROM a lossy source (MP3, M4A), the WAV won't be higher quality than the source — it'll just be uncompressed.
How long does conversion take?
Decoding is near-instant. Encoding speed depends on output format: WAV is essentially instant (just writing bytes). MP3 takes about 1 second of compute per 10 seconds of audio on a modern laptop — so a 5-minute song encodes in roughly 30 seconds. Phones are slower; expect 2-3x longer. Progress is shown live as the encoder works.
Does this work on mobile?
Yes. Tap the drop zone to open the file picker, choose your audio file, hit Convert. The result downloads to your device's standard download location. iOS users: the file lands in the Files app under Downloads.
What about ID3 tags (artist, album, song title)?
Original ID3 tags are not preserved in v1 — the encoded file gets no metadata. The audio itself is preserved exactly. If you need to keep artist/album/title info, you'll want to re-tag the output with a tool like MP3Tag (Windows) or Kid3 (cross-platform) after converting.
Will the WAV sound better than the MP3?
No. MP3 encoding permanently discards audio information; converting back to WAV doesn't recover what's gone. The resulting WAV will have the same audible quality as the source MP3 — just uncompressed (and much larger). Going to WAV is about compatibility with editing/processing tools that require uncompressed input.
Why is the WAV so much bigger than the MP3?
MP3 typically compresses audio 7-10× compared to uncompressed PCM. Converting back expands the file to its uncompressed size. A 5MB MP3 will produce a ~50MB WAV. That's just what uncompressed audio costs.
What sample rate and bit depth does the WAV use?
The WAV uses the same sample rate the MP3 was encoded at (typically 44.1 kHz for music, 48 kHz for video audio). Bit depth is 16-bit signed PCM — the standard for 'CD-quality' audio and what most editing software expects.
Why would I want to do this?
The most common reasons: editing in Audacity or another DAW (which prefer WAV); transcription software (Otter, Whisper) that requires lossless input; CD authoring (WAV is the source format for audio CDs); broadcasting systems that require PCM.