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。
下载:7-Zip 9.26What's new after 7-Zip 9.25 alpha:
- 7-Zip now can update WIM archives.
- 7-Zip File Manager now can move files to archives.
- The default encoding for TAR format now is UTF-8. You can use -mcp=1 switch for OEM encoding.
- Command line version: - new "rn" command to rename files in archive.
- new -sdel switch to delete files after including to archive. - new -sns switch to store NTFS alternate streams (for WIM format only). - new -sni switch to store NT security information for files (for WIM format only).
- Speed optimizations for opening big archives and big disk folders.
- Some bugs were fixed. - New localization: Aragonese.