Which bitrate?
192 kbps is transparent for nearly all music — the sane default. 128 for speech and voice memos. 256 if you want headroom for critical listening. All far smaller than the WAV either way: a 50 MB WAV becomes ~5 MB at 192.
FAQ
Any file limits?
None — batch a folder of session exports. Big files work best on a computer.
Does the audio get uploaded?
No. Decode and encode both run in your browser; airplane mode works.
Need the other direction?
MP3 to WAV is one click away.