Keep the audio handoff local and explicit
A WAV download is the selected result, not an editing project.
One short source at a time
Choose WAV, MP3 or OGG up to 12 MB. Browser codec support varies. Duration metadata is checked before full Web Audio decoding, then decoded audio is checked again: mono/stereo, up to 120 seconds, 8–96 kHz and 64 MB decoded float PCM. A file can meet the compressed-byte limit and still fail the decoded limit.
The generated tone example needs no file upload or microphone. The app does not record, transcribe, fetch remote audio URLs or send files to an AI/API service. Hosting still receives ordinary website requests.
What the download contains
The output is a newly encoded 16-bit little-endian PCM WAV with one or two interleaved channels at the decoded sample rate. It contains the processed selection, not the unselected source or an undo history. WAV may be much larger than a compressed MP3. A text audit records sample bounds, gain, fade frames and peak/clipping counts.
What is not saved
Source audio, settings and up to 30 Undo states are held in tab memory. Undo covers applied settings for the current source; opening another file resets history. There is no project import, autosave or cloud sync. Keep the original separately and download the result before closing.
Processing a file does not grant permission to reuse it. Use audio you own or have permission to edit and distribute, and check the final file in its destination player.