Convert MP3 to WAV
Your files are processed on your device. We never upload them.
Audio is read and written with Mediabunny. MP3 files are made with LAME and FLAC files with libFLAC; browsers without their own AAC encoder use FFmpeg's. Apple Lossless files follow Apple's ALAC code.
How to convert MP3 to WAV
- 01A ▸Choose an MP3 file, or drop it on the page.
- 02A ▸Select Convert to WAV.
- 03A ▸Listen to the result and download it.
About MP3 to WAV
Where MP3 files come from
MP3 is the most common audio file, from downloads, podcasts, and old music libraries. Audio editors, samplers, DJ software, CD burning, and some game engines and phone systems want uncompressed WAV instead, so they can cut and mix without decoding.
What changes
- The MP3 is decoded once into plain 16-bit samples. Nothing more is lost, but nothing the MP3 dropped comes back.
- The file grows about tenfold, because WAV isn't compressed.
- The sample rate and mono or stereo stay as they were in the MP3.
- ID3 tags (title, artist, cover) aren't copied; most WAV software ignores them.
Measured
Our three-minute music-like sample (stereo, 44.1 kHz, the length of a typical song), saved as a 128 kbps MP3 and converted to 16-bit WAV in Chrome on a laptop. Phone timings are still to be measured.
| MP3 file | 2.7 MB |
|---|---|
| WAV file | 30.3 MB |
| Time in Chrome (laptop) | 0.8 seconds |
In your browser
Chrome, Edge, Firefox, and Safari 26 and later decode the MP3 with their own built-in decoders, inside a background worker. Older Safari decodes it on the page with its audio engine instead. The WAV is written by our own code, so there's nothing extra to download.
Limits
- The whole song is held in memory as it's decoded. On a phone, files over about 15 minutes get a warning first.
- Free-format and very old MPEG-2.5 MP3 files may not decode in every browser.
Other options
- Trim audio: cut the part you need first, and save it as WAV.
- MP3 to FLAC (audio converter): lossless like WAV, at about half the size.
- WAV to MP3: the other way, to make a WAV small.
Questions
Does converting MP3 to WAV improve the quality?
No. The WAV holds exactly the sound the MP3 decodes to; detail the MP3 dropped can't come back. What you gain is a file every editor, sampler, and CD burner accepts, with no further loss when you edit and save it again.
Are my files uploaded?
No. Your files are processed on your device. We never upload them.
Why is the WAV so much bigger?
WAV stores every sample uncompressed, about 10 MB a minute for CD-quality stereo. A 4 MB MP3 song becomes about 40 MB.
What sample rate and bit depth is the WAV?
16-bit, at the MP3's own sample rate (usually 44.1 kHz) and channels. That's CD quality and what samplers and CD software expect.
Why is the WAV a tiny bit longer than the song?
MP3 encoders pad the sound with a few milliseconds of silence. The WAV can keep some of it, about a hundredth of a second, which you won't hear. Trim it with Trim audio if a loop must be exact.