7-Zip是一个开放源码的数据压缩程序，主要用在Microsoft Windows操作系统，Unix-like的操作系统如Linux与 FreeBSD下面有7-zip的移植版本p7zip可以使用。它提供命令行接口的程序或图形用户界面的程序，而且可以与资源管理器结合。7-Zip是自 由软件，由Igor Pavlov于1999年开始发展，并把主体在GNU LGPL下发布，加密部份使用AES的代码，使用BSD license发布，解压RAR部分使用RAR特定的许可协议。
7-Zip for 32-bit Windows:
http://dl.7-zip.org/7z934.exe
http://dl.7-zip.org/7z934.msi
7-Zip for 64-bit Windows x64:
http://dl.7-zip.org/7z934-x64.msi
7-Zip 9.34 alpha version is provided without source code.
Source code will be released in future beta version.
Please write here at forum about any new bugs.
What's new after 7-Zip 9.33 alpha:
The BUG in 9.33 was fixed:
Command line version of 7-Zip could work incorrectly, if there is relative
path in exclude filename optiton (-x) and absolute path as include filename.
The BUG in 9.26-9.33 was fixed:
7-Zip could not open some unusual 7z archives that were created by another
software (not by 7-Zip).
The BUG in 9.31-9.33 was fixed:
7-Zip could crash with switch -tcab.