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MP4 · MOV · MKV · M4A → MP3
0 = whole file; set a start time and duration to extract only a clip.
The first run downloads a ~31 MB transcoding engine (cached afterwards).
Extract the audio track from MP4, MOV, MKV, M4A and similar files and save it as MP3. Pick 128/192/320 kbps or VBR quality, and extract just a clip if you like. Encoding runs locally through a WebAssembly build of FFmpeg with libmp3lame — your file is never uploaded. The first conversion downloads a ~31 MB engine, which is then cached.