7-Zip解压软件是一个开放源码的数据压缩程序，7-Zip主要用在Microsoft Windows操作系统，Unix-like的操作系统，zol提供7-Zip解压软件官方版下载。

7-Zip是一款GNU/LPGL协议下分发的免费软件，可以说是目前最有希望成为zip、rar之后的下一个主流压缩格式的文件压缩格式了。7zip的压缩率是他最大的竞争优势，在选择普通压缩率的情况下我们已经可以轻松击败winrar的最高压缩率了。但是7zip也不完美(要是完美了，RAR就已经被取代了)，主要是软件的界面依然不够优秀，格式本身对于分卷压缩的支持也不好，但是这不妨碍7zip成为最有潜力的压缩格式。

7-Zip 正式版主要特征：

更新了算法来加大 7z 格式 的压缩比

7-Zip 是基于 GNU LGPL 之下发布的软件

支持格式：

压缩及解压缩：7z、ZIP、GZIP、BZIP2 和 TAR

仅解压缩：RAR、CAB、ISO、ARJ、LZH、CHM、Z、CPIO、RPM、DEB 和 NSIS

对于 ZIP 及 GZIP 格式，7-Zip 能提供比使用 PKZip 及 WinZip 高 2-10% 的压缩比

7z 格式支持创建自释放(SFX)压缩档案

集成 Windows 外壳扩展

强大的的文件管理

强大的命令行版本

支持 FAR Manager 插件

支持 63 种语言

更新日志：

7-Zip 9.20.11:

What's new: - 7-Zip now can unpack UEFI BIOS files. - 64-bit version of 7-Zip now includes additional 32-bit shell extension DLL. So other 32-bit programs can call 64-bit 7-Zip via context menu. - Now it's possible to associate 7-Zip with file types without Administrator rights. - New -mf=FilterID switch to specify compression filter. Examples: 7z a -mf=bcj2 a.7z a.tar 7z a -mf=delta:4 a.7z a.wav 7z a -mf=bcj a.tar.xz a.tar - There are some changes in LZMA settings for BCJ2 filter. So compression ratio now is slightly improved for executable files in -mx9 mode for .7z format. - Some bugs were fixed. - New localizations: Corsican, Kyrgyz, Ligurian. What's new in latest alpha update: - 7-Zip now remembers "Show Password" option selection. - The bug in latest alpha versions was fixed: Default solid block size was small (command line version only).

9.20.09 Alpha更新：

- The bug was fixed: 7-Zip File Manager could work incorrectly with archives

in "Flat View" mode.

- 7-Zip File Manager now can update file in archive even if the file name is

not supported by Windows.

-9.20.06 Alpha

- 7-Zip now can unpack UEFI BIOS files.

- 64-bit version of 7-Zip now includes additional 32-bit shell extension DLL.

So other 32-bit programs can call 64-bit 7-Zip via context menu.

- Now it's possible to associate 7-Zip with file types without Administrator

rights.

- New -mf=FilterID switch to specify compression filter. Examples:

7z a -mf=bcj2 a.7z a.tar

7z a -mf=delta:4 a.7z a.wav

7z a -mf=bcj a.tar.xz a.tar

- There are some changes in LZMA settings for BCJ2 filter.

So compression ratio now is slightly improved for executable files in -mx9

mode for .7z format.

- Some bugs were fixed.

- New localizations: Corsican, Kyrgyz.

-9.20.04 Alpha

7-Zip now can unpack UEFI BIOS files.

- 64-bit version of 7-Zip now includes additional 32-bit shell extension DLL. So other 32-bit programs can call 64-bit 7-Zip via context menu.

- Now it's possible to associate 7-Zip with file types without Administrator rights.

- Some bugs were fixed.

- New localizations: Corsican, Kyrgyz.

7—zip 9.15 版本新功能：

修正了已知错误

新增本地化语言：Tatar(鞑靼语)

7—zip 9.14 版本新功能：

- WIM support was improved. 7-Zip now can create WIM archives without compression. Please check the compatibility between 7-Zip and Windows for WIM archives.

7—zip 9.13 版本新功能：

7-Zip now stores NTFS file timestamps to ZIP archives.

New additional "Open archive >" item in context menu allows to select

archive type for some files.

Some bugs were fixed.

New localization: Uyghur.

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