Converting M4A to MP3 extracts the AAC audio from its MP4 container and transcodes it to the most universally compatible lossy format. The result plays on any device made in the last 25 years (older car stereos, dash cams, cheap Bluetooth speakers) that won't touch M4A.
Drag & drop audio files here, or browse
Drop your M4A files here
Two lossy codecs in series loses more than the original encode did. Keep the MP3 bitrate at or above the M4A's bitrate (often slightly higher) to end up with audio that sounds similar. The original source would always produce a better MP3.
MP3 plays on everything. There's no practical limit to where you can play an MP3 file.
M4A is an MPEG-4 container that almost always holds AAC audio (though it can hold ALAC too). The payload is identical to what's inside an .aac file; the difference is that M4A carries proper tags, chapter markers, and cover art. iTunes, Apple Music, and iOS write M4A by default.
MP3 is the most widely supported lossy audio format. Encoded in 1993 and still the default on countless devices, it trades some fidelity for dramatically smaller files. At 192 kbps most listeners cannot distinguish it from the source. Anything that plays audio will play MP3.
Yes. M4A (AAC) is more efficient, so at the same bitrate MP3 sounds slightly worse. Go 20–30% higher bitrate on the MP3 side to match perceived quality.
No. Apple Music downloads contain FairPlay DRM that prevents conversion. Only unprotected M4A files (your own rips, purchased tracks without DRM) can be transcoded directly.
M4A is an MPEG-4 container that almost always holds AAC audio (though it can hold ALAC too). The payload is identical to what's inside an .aac file; the difference is that M4A carries proper tags, chapter markers, and cover art. iTunes, Apple Music, and iOS write M4A by default.
MP3 is the most widely supported lossy audio format. Encoded in 1993 and still the default on countless devices, it trades some fidelity for dramatically smaller files. At 192 kbps most listeners cannot distinguish it from the source. Anything that plays audio will play MP3.
Yes. The converter runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio files are never uploaded, never sent to a server, and never leave your device.
There's no hard limit, but because everything runs in your browser you're bounded by available memory. Files over about 2 GB total can get slow or hit browser memory limits. Process in smaller batches if you run into issues.