FLAC vs M4A
How do FLAC and M4Acompare? Here's everything you need to know to choose the right format — and how to convert between them.
.flac
Full guide →Free Lossless Audio Codec
FLAC is the leading open-source lossless audio format. It compresses audio files to about 50-60% of their original size without any quality loss — perfect for audiophiles and music archival.
.m4a
Full guide →MPEG-4 Audio
M4A is an audio-only MPEG-4 container, typically containing AAC or ALAC encoded audio. It's Apple's preferred format for music files in iTunes and Apple Music.
| Specification | FLAC | M4A |
|---|---|---|
| Full name | Free Lossless Audio Codec | MPEG-4 Audio |
| Extension | .flac | .m4a |
| MIME type | audio/flac | audio/mp4 |
| Category | Audio | Audio |
| Developer | Xiph.Org Foundation | Apple / ISO |
| Year introduced | 2001 | 2001 |
| Compression | Lossless | Lossy |
FLAC advantages
- Lossless — identical to original audio
- 50-60% smaller than WAV
- Open source and royalty-free
- Excellent metadata and tagging support
FLAC limitations
- Larger than lossy formats like MP3
- Not supported by all portable devices
- Slower to encode than lossy formats
- iTunes/Apple Music prefer ALAC
M4A advantages
- Better quality than MP3 at same size
- Native Apple ecosystem support
- Supports both lossy (AAC) and lossless (ALAC)
- Rich metadata and artwork
M4A limitations
- Less universal than MP3
- Confusing relationship with AAC
- Some older devices don't support it
- Apple-centric ecosystem
Which should you use?
FLAC preserves full audio quality with no compression artifacts. M4A offers much smaller files at the cost of some quality. For casual listening, M4A is fine. For production or archival, use FLAC.
Best uses for FLAC
Best uses for M4A
Convert between FLAC and M4A
Need to switch formats? Convert for free with SquishConvert.