| Filename extension | .xz |
|---|---|
| Internet media type | application/x-xz |
| Magic number | .7zXZ |
| Developed by | The Tukaani Project |
| Latest release | 1.0.4 / August 27, 2009 |
| Open format? | Yes |
| Website | tukaani.org/xz/format.html |
xz is a lossless data compression file format incorporating the LZMA2 compression algorithm. Like gzip and bzip2, concatenation is supported to compress multiple files, but the convention is to bundle a file that is an archive itself, such as those created by the tar or cpio Unix programs.
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An implementation of the xz file format is freely available online under the name XZ Utils. Version 1.22 of GNU tar supports using this software to handle xz files transparently (as it normally does with gzip and bzip2).[1][2] The implementation as of version 4.999.9beta is licensed under the terms of the GNU LGPL and GNU GPL, with the bulk of the software (e.g., liblzma) in the public domain.[3]
7-Zip supports xz as of version 9.04 beta.[4]
xz is used by the GNU coreutils project since version 7.1 to compress its release tarballs.[5] It has gained notability for compressing packages in Fedora[6], Arch Linux[7], FreeBSD, Slackware, CRUX, and Funtoo.
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