Format comparison

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.

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.

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.

SpecificationFLACM4A
Full nameFree Lossless Audio CodecMPEG-4 Audio
Extension.flac.m4a
MIME typeaudio/flacaudio/mp4
CategoryAudioAudio
DeveloperXiph.Org FoundationApple / ISO
Year introduced20012001
CompressionLosslessLossy

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

Hi-fi music collections
Audio archival and preservation
CD ripping at full quality
Audiophile music streaming

Best uses for M4A

iTunes music library
Apple Music downloads
Podcast distribution
Audiobook files

Convert between FLAC and M4A

Need to switch formats? Convert for free with SquishConvert.