7-Zip 是一款自由及開放原始碼軟體，大部份原始碼以 GNU LGPL 許可證發布，亦有部份以 BSD 3-clause 許可證發布，另有部分受 unRAR 許可證限制。
7-Zip 主要特性：
* 以 LZMA 演算法製作出高壓縮率的 7z 格式 * 7-Zip 是基於 GNU LGPL 之下散佈的自由軟體 * 支援格式： o 壓縮、解壓：7z、ZIP、GZIP、BZIP2 和 TAR o 僅解壓：RAR、CAB、ARJ、LZH、CHM、Z、CPIO、RPM 和 DEB * 對於 ZIP 和 GZIP 格式，7-Zip 提供比 PKZip 和 WinZip 高 2~10% 的壓縮比 * 7z 格式自解壓縮檔 * 整合 Windows Shell * 檔案管理器 * 命令列版本 * 支援 FAR Manager 插件 * 本地化 (含英文) 66 種
7-Zip is an open source file archiver predominantly for the Microsoft Windows operating system. It operates either as a command line program or with a graphical user interface. It also features integration with the Windows shell environment. 7-Zip is free software, distributed under the GNU LGPL license.
Features:
* High compression ratio in new 7z format with LZMA compression * 7-Zip is free software distributed under the GNU LGPL * Supported formats: 7z, ZIP, CAB, RAR, ARJ, GZIP, BZIP2, Z, TAR, CPIO, RPM and DEB * For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 % better than ratio provided by PKZip and WinZip * Self-extracting capability for 7z format * Integration with Windows Shell * Powerful File Manager * Powerful command line version * Plugin for FAR Manager * Localizations for 55 languages
