FLAC (Free Lossless Audio Codec)
FLAC is an open-source lossless audio codec that compresses audio to 50-70% of the original size without losing a single bit of quality. It is the preferred format for audiophiles, music archiving, and any use case where preserving full audio fidelity matters.
MIME Type
audio/flac
Type
Binary
Compression
Lossless
Advantages
- + Bit-perfect lossless compression — no quality loss whatsoever
- + 50-70% compression ratio saves significant storage
- + Open source with universal player support
- + Rich metadata via Vorbis Comments and embedded album art
Disadvantages
- − Files are 2-3x larger than lossy MP3 at equivalent listening quality
- − Not supported by some older devices and car stereos
- − Streaming bandwidth requirements are higher than lossy codecs
When to Use .FLAC
Use FLAC for archiving music collections, distributing high-fidelity audio, and any scenario where lossless quality at reduced file size is needed.
Technical Details
FLAC uses linear prediction, residual coding, and Rice/Golomb entropy coding to compress audio losslessly. It supports up to 32-bit depth, 655 kHz sample rate, and 8 channels. Seeking is enabled through a seek table in the stream.
History
Josh Coalson released FLAC in 2001 as a free, open-source alternative to proprietary lossless codecs. The Xiph.Org Foundation now maintains it. FLAC support became standard in Android, iOS, and most music players.
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