Home7z FormatLZMA SDKDownloadFAQSupportLinksEnglishAfrikaansArabicBulgarianChinese Simpl.Chinese Trad.EsperantoFrenchGermanHungarianJapanesePersianPolishPortuguese BrazilRussianSpanishThaiUkrainian7-Zip7-Zip is a file archiver with a high compression ratio.Download 7-Zip 9.20 (2010-11-18) for Windows:LinkTypeWindowsSizeDownload.exe32-bit x861 MBDownload.msi64-bit x641 MBThe download links above redirect you to download pages on SourceForge.netLicense7-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.The main features of 7-ZipHigh compression ratio in 7z format with LZMA and LZMA2 compressionSupported formats:Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIMUnpacking 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 WinZipStrong AES-256 encryption in 7z and ZIP formatsSelf-extracting capability for 7z formatIntegration with Windows ShellPowerful File ManagerPowerful command line versionPlugin for FAR ManagerLocalizations for 79 languages7-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.Compression ratioWe 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 Windowsafter full installation.
Archiver
Mozilla Firefox
Google Earth
161 files15,684,168 bytes
115 files23,530,652 bytes
Compressed size
Ratio
Compressed size
Ratio
7-Zip 4.23 (7z format)
4621135
100%
6109183
100%
WinRAR 3.50
5021556
109%
6824892
112%
CABARC 5.1
5131393
111%
7434325
122%
WinZip 10.0 beta (maximum-PPMd)
5277118
114%
8200708
134%
7-Zip 4.23 (zip format)
6222627
135%
8909446
146%
WinZip 10.0 beta (maximum-portable)
6448666
140%
9153898
150%
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.
7-Zip 9.34 alpha
2014-06-22
7-Zip 9.34 alpha
7-Zip 9.30 alpha
2012-10-26
7-Zip 9.30 alpha
7-Zip 9.25 alpha
2011-09-16
Forum: 7-Zip 9.25 alpha
Download 7-Zip 32-bit
Download 7-Zip x64
7-Zip 9.22 beta
2011-04-18
7-Zip 9.22 beta
7-Zip 9.20
2010-11-18
History of 7-zip changes
Copyright (C) 2014 Igor Pavlov.