Converting MP3 to M4A re-encodes through the AAC codec and wraps it in an MPEG-4 container. The result is typically 30% smaller than the MP3 at matching perceived quality, with proper iTunes-style metadata, embedded artwork, and chapter support baked in.
Drag & drop audio files here, or browse
Drop your MP3 files here
This is a lossy-to-lossy transcode, so expect a small, usually inaudible quality drop. Matching or exceeding the MP3's bitrate keeps the loss negligible. In exchange you get Apple-native playback, better tagging, and smaller files.
M4A plays on all Apple devices, Windows (via iTunes, Groove, VLC), Android (native), and every modern browser. Some older car stereos and cheap MP3 players won't recognize M4A; those remain MP3-only territory.
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.
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.
The audio inside is AAC. M4A is the container, an MPEG-4 wrapper that adds tag, artwork, and chapter support. Playback quality is identical to a raw .aac stream.
Yes. Android, Windows, and modern browsers all handle M4A natively. The edge cases are older cars, dash cams, and cheap MP3 players that were built before AAC support was common.
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.
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.
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.