Need M4A to MP3 without installing anything? Drop your files anywhere on this page. Each one is decoded, encoded with LAME at 192 kbps by default, and saved as an MP3; batch as many as you want and nothing uploads.
Why M4A files get rejected everywhere
M4A is AAC audio in an MP4 container. Technically excellent, but car stereos, older software, some Android apps, transcription services and court/HR submission systems still want MP3. One decode, one high-quality encode, done in seconds.
FAQ
Voice memos from iPhone?
Yes. That's exactly what they are. AirDrop or transfer them over, drop them here. There's also a dedicated voice-notes page that additionally handles WhatsApp .opus and voicemail files.
Audiobook .m4b files?
They convert (drop them here), currently as one long MP3. Chapter splitting is on the workbench.
Quality?
The default is 192 kbps, the highest here, so you never have to wonder whether you gave up quality. 128 is transparent for speech, and 96 makes the smallest files for pure voice.