About MP3 and WAV

MP3 is the most widely supported audio format there is — every browser, player, car stereo, and podcast app reads it. It's lossy, so quality is traded for file size, but at 192 kbps and up most listeners can't tell.

WAV is uncompressed PCM audio — the raw samples with a small header. It's the standard interchange format for recording, sampling, and production work, at the cost of roughly 10 MB per minute of stereo.

Converting MP3 to WAV produces a lossless file, though detail already discarded by MP3's compression can't be recovered — the new file is a faithful copy of the MP3, not of the original recording.

How the conversion works

This tool runs FFmpeg — the same engine behind most media software — compiled to WebAssembly, entirely in your browser. Your file is read locally, converted locally, and saved straight from memory; nothing is ever uploaded, which also means no queues and no server-side file size limits.

The converter itself is a one-time ~31 MB download on your first conversion, cached by the browser afterwards. Once it's loaded, everything works offline.