MP3 to WAV Converter
Convert MP3 to uncompressed 16-bit WAV in your browser, with optional sample-rate choice. Free, private, no signup or upload.
About the MP3 to WAV Converter
This free MP3 to WAV converter decodes your MP3 and writes it back out as an uncompressed 16-bit PCM WAV file — the format many audio editors, DAWs, samplers and voice tools expect for editing. You can keep the original sample rate or resample to 44.1 kHz, 48 kHz or a smaller 22.05 kHz.
The conversion runs locally in your browser through FFmpeg WebAssembly, so nothing is uploaded. The engine (around 30 MB) is fetched from a CDN on first use and cached, so your first conversion is slower than the ones that follow.
Be aware that WAV is uncompressed: the output will be considerably larger than the MP3, and because the MP3 was already lossy, converting to WAV does not restore detail that MP3 compression discarded. It simply gives you an editable, lossless container to work from. Files up to 100 MB are supported.
How to Use the MP3 to WAV Converter
- 1Choose an MP3 file, up to 100 MB.
- 2Keep the original sample rate or pick 44.1 kHz, 48 kHz or 22.05 kHz.
- 3Click Convert to WAV and watch the progress bar.
- 4Preview and download your 16-bit WAV file.
Frequently Asked Questions
Is my audio uploaded to a server?
No. Decoding and WAV encoding run in your browser via FFmpeg WebAssembly. The MP3 never leaves your device.
Why is the first conversion slow?
On first use the browser downloads the FFmpeg core (~30 MB) from a CDN and compiles it. It is then cached for the session, so subsequent conversions are quick.
Why is the WAV file so much bigger than the MP3?
WAV is uncompressed PCM audio, while MP3 is compressed. A WAV can easily be ten times larger — that is expected and is the price of a lossless, editing-friendly format.
Does converting to WAV improve quality?
No. The MP3 was already lossy, so the WAV faithfully reproduces the MP3 but cannot recover detail that compression removed. It just gives you a lossless file to edit.
What sample rate should I pick?
Keep the original unless a tool requires something specific. 44.1 kHz is standard for music, 48 kHz for video. Choose 22.05 kHz only if you deliberately want a smaller file.