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FLAC vs ALAC: Lossless Audio Formats Compared

Published on March 8, 2026

There is no difference in sound quality between FLAC and ALAC. Both are lossless codecs that compress audio to roughly half its original size while preserving every bit of the original recording. The real difference is ecosystem support: FLAC works on almost everything except Apple devices (natively), while ALAC works natively on iPhones, iPads, Macs, and iTunes.

Sound Quality

Identical. Both FLAC and ALAC are mathematically lossless. When you decode a FLAC file or an ALAC file back to PCM audio, you get bit-for-bit the same data as the original recording. No frequencies are removed, no dynamic range is lost, no artifacts are introduced. Any blind listening test between the two at the same source recording will produce zero audible difference.

File Size

ALAC files are typically 5-12% smaller than FLAC files for the same audio content. Both compress CD-quality audio (16-bit, 44.1kHz) to about 50-60% of the original WAV size. The size difference is small enough that it rarely matters in practice. A 30MB WAV file becomes roughly 18MB as FLAC and 16-17MB as ALAC.

Device Compatibility

This is where the choice actually matters. FLAC is supported by Android phones, most car stereos with USB playback, VLC, foobar2000, Winamp, Spotify (for local files), Plex, Sonos, and essentially every non-Apple audio device. ALAC is natively supported on iOS, macOS, Apple Music, iTunes, HomePod, and AirPlay devices. Apple added FLAC playback support in iOS 11 (2017) and macOS High Sierra, but Apple Music and iTunes still cannot organize or sync FLAC files natively.

Metadata and Tagging

FLAC uses Vorbis comments for metadata: artist, album, track number, album art, lyrics, and custom fields. The tagging ecosystem is mature and well-supported by music library apps. ALAC files sit inside an M4A container (same as AAC) and use iTunes-style MP4 atoms for metadata. Both handle basic tags well. FLAC has slightly better support for custom and extended metadata fields.

Open Source vs Proprietary

FLAC has been open source since its creation in 2001 by Xiph.org. The specification, encoder, and decoder are all freely available. Apple open-sourced the ALAC codec in 2011, but the M4A container format and Apple Music integration remain proprietary. In practice, this means more third-party tools and players support FLAC natively, since developers can implement it without licensing concerns.

Quick Recommendation

  • Apple ecosystem (iPhone, Mac, HomePod): ALAC. Native support everywhere.
  • Android, Windows, Linux: FLAC. Wider support, more player options.
  • Mixed device household: FLAC. Most Apple devices can play it now too.
  • Archival storage: FLAC. Open format, more future-proof.

If you need to convert lossless audio to a smaller lossy format for portable use, our audio compressor handles FLAC, WAV, and other formats with adjustable bitrate settings. For converting between WAV and MP3, use the WAV to MP3 converter.

Related reading: ALAC vs AAC compares Apple's lossless and lossy codecs, WAV vs FLAC compares compressed and uncompressed lossless, FLAC to MP3 covers what you lose going lossy, and lossless vs lossy compression explains how both compression types work across all file formats.