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7-Zip is a file archiver with a high compression ratio.
Download 7-Zip 9.20 (2010-11-18) for Windows:

Download.exe32-bit x861 MB
Download.msi64-bit x641 MB
The main features of 7-Zip

  • High compression ratio in 7z format with LZMA and LZMA2 compression
  • Supported formats:
  • Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
  • Unpacking only: ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR and Z.
  • For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip
  • Strong AES-256 encryption in 7z and ZIP formats
  • Self-extracting capability for 7z format
  • Integration with Windows Shell
  • Powerful File Manager
  • Powerful command line version
  • Plugin for FAR Manager
  • Localizations for 79 languages
Compression ratio
ArchiverMozilla FirefoxGoogle Earth
161 files
15,684,168 bytes
115 files
23,530,652 bytes
Compressed sizeRatioCompressed sizeRatio
7-Zip 4.23 (7z format)4621135100%6109183100%
WinRAR 3.505021556109%6824892112%
CABARC 5.15131393111%7434325122%
WinZip 10.0 beta (maximum-PPMd)5277118114%8200708134%
7-Zip 4.23 (zip format)6222627135%8909446146%
WinZip 10.0 beta (maximum-portable)6448666140%9153898150%

The download links above redirect you to download pages on SourceForge.net
7-Zip is open source software. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions. Check license information here: 7-Zip license.
You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip.
7-Zip works in Windows 7 / Vista / XP / 2008 / 2003 / 2000 / NT / ME / 98. There is a port of the command line version to Linux/Unix.
On 7-Zip's Source Forge Page you can find a forum, bug reports, and feature request systems.
We compared 7-Zip with some of the leading archivers.
FILE SETS: Mozilla Firefox 1.0.7 for Windows and Google Earth 3.0.0616 for Windows after full installation.
Compression ratio results are very dependent upon the data used for the tests. Usually, 7-Zip compresses to 7z format 30-70% better than to zip format. And 7-Zip compresses to zip format 2-10% better than most of other zip compatible programs.