Converting FLAC to M4A encodes through AAC and packages the result with proper metadata in an MPEG-4 container. It's the cleanest way to get lossless archives into Apple Music, iPhones, or any device where M4A is the native container.
Drag & drop audio files here, or browse
Drop your FLAC files here
Lossy compression loses some signal, but starting from lossless FLAC means the AAC encoder has ideal input. At 256 kbps the result is transparent to nearly everyone; at 192 kbps still excellent for all casual listening.
M4A runs on all Apple devices, Android, Windows (iTunes, Groove, VLC), and every modern browser. Older hardware may not handle M4A; check before committing a whole library.
FLAC is a lossless compressor: it shrinks PCM audio to roughly 50–60% of its original size and decodes back to a bit-perfect copy. It supports tags, cue sheets, and up to 32-bit / 655 kHz, which makes it the de facto format for CD rips and audiophile music libraries.
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.
ALAC. Apple's lossless codec produces bit-perfect output like FLAC does. M4A is usually lossy AAC, though the container can technically hold ALAC. If you want lossless, specify ALAC explicitly.
M4A supports all the important tags (artist, album, track, artwork, year) plus chapter markers. Some edge-case FLAC metadata like cue sheets may not translate, but the common fields all map cleanly.
FLAC is a lossless compressor: it shrinks PCM audio to roughly 50–60% of its original size and decodes back to a bit-perfect copy. It supports tags, cue sheets, and up to 32-bit / 655 kHz, which makes it the de facto format for CD rips and audiophile music libraries.
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.