MP3 to WAV Converter

Turn MP3 files into WAV for audio editors, DJ software, samplers, video editors and speech tools that want uncompressed PCM. Choose 16-bit for the widest compatibility, 24-bit or 32-bit float for editing headroom, and the sample rate a program asks for (for example 16 kHz mono for speech recognition). Everything is converted inside your browser.

How to use this tool

1. Choose one or more MP3 files (other formats work too).
2. Pick the bit depth: 16-bit unless your software asks for more.
3. Keep the sample rate, or pick the one you need; choose mono or stereo.
4. Press Calculate and download the WAV files.

Formula

WAV size (bytes) = header + sample rate × channels × bytes per sample × seconds

The header is 44 bytes for 16-bit, 68 bytes for 24-bit (WAVE_FORMAT_EXTENSIBLE) and 58 bytes for 32-bit float (with the fact chunk the format requires). Resampling is done by the browser's decoder, which uses a high-quality band-limited resampler. Very long files and formats the browser cannot decode are written by the ffmpeg engine (about 30 MB, downloaded once).

Example

A 4-minute stereo MP3 at 44.1 kHz becomes a 16-bit WAV of 44 + 44,100 × 2 × 2 × 240 = 42,336,044 bytes (≈ 40.4 MB). In 24-bit it is 1.5 times that, about 60.6 MB.