M4A to MP3

Re-encode an M4A file as a variable-bitrate MP3 using LAME. Useful for iTunes / Apple Music downloads, voice memos, or any AAC-in-MP4 audio you need to play on devices that only handle MP3. Conversion runs entirely in your browser via ffmpeg.wasm — your file never touches a server. Expect a few seconds for a 5-minute song; longer files may take a minute or two.