FLAC

FLAC (/flæk/; Free Lossless Audio Codec) is an audio coding format for lossless compression of digital audio, developed by the Xiph.Org Foundation, and is also the name of the free software project producing the FLAC tools, the reference software package that includes a codec implementation. Digital audio compressed by FLAC's algorithm can typically be reduced to between 50 and 70 percent of its original size and decompresses to an identical copy of the original audio data.

Free Lossless Audio Codec
Developer(s)Xiph.Org Foundation, Josh Coalson, Erik de Castro Lopo
Initial release20 July 2001 (2001-07-20)
Stable release
1.4.3 / 23 June 2023 (23 June 2023)
Repository
Written inC, C++
Operating systemCross-platform
TypeCodec
LicenseCommand-line tools: GNU GPL
Libraries: BSD
Websitexiph.org/flac
Free Lossless Audio Codec
Filename extension
.flac
Internet media type
audio/flac
Uniform Type Identifier (UTI)org.xiph.flac
Magic numberfLaC
Type of formatLossless audio
Standardxiph.org/flac/format.html
Open format?Yes
Free format?Yes

FLAC is an open format with royalty-free licensing and a reference implementation which is free software. FLAC has support for metadata tagging, album cover art, and fast seeking.

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