If your M4A is ALAC, FLAC keeps it lossless at half the size of WAV. If it's AAC, the conversion can't recover lost detail — FLAC just preserves what's there.
About M4A
Common audio container in Apple ecosystem
M4A is an MPEG-4 audio container, usually AAC or ALAC encoded, widely used across Apple devices and iTunes with a good balance of size and quality.
- Good balance of size and quality
- Native to the Apple ecosystem
- Limited support on some non-Apple players
About FLAC
Lossless compressed format
FLAC uses lossless compression, cutting file size roughly in half while keeping the original audio quality. It is widely used by audiophiles and for archiving.
- Lossless, identical to the source
- Much smaller than WAV
- Some older players lack support
M4A to FLAC FAQ
Will converting M4A to FLAC lose quality?
If your M4A file is AAC (lossy), converting to lossless FLAC adds no new degradation — but already-lost quality cannot be restored. If it is ALAC (lossless), no quality is lost at all.
Will the file size change after conversion?
Converting to a lossless format (WAV) usually increases size, while converting to a lossy format (MP3, AAC) usually decreases it, depending on the chosen bitrate and sample rate.
How do I batch convert M4A to FLAC?
Just drop multiple M4A files in; they are converted to FLAC one by one via a queue. You can download them individually or as a single ZIP.