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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:
LicenseThe 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.
The main features of 7-Zip
- High compression ratio in 7z format with LZMA and LZMA2compression
- 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
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.
Compression ratio
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.
| Archiver | Mozilla Firefox | Google Earth | ||
|---|---|---|---|---|
| 161 files 15,684,168 bytes | 115 files 23,530,652 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.
Open Any Compressed File
Open and Create 7z, ZIP, CAB, RAR, ARJ, LZH, CHM, GZIP,
BZIP2, Z, TAR, ISO, MSI, NSIS, RPM formats and more!
What is 7-Zip?
7-Zip is a file archiver, just like winzip or winRAR. 7-Zip can open compressed files or compress files. Compressed files take up less space and are a great way to save room in your hard drive or when emailing a large file. What makes 7-Zip stand out from other file archivers is that it's completely FREE.
How can we offer 7-Zip free? File archivers have become an essential part of how people communicate and work over email. We think that everyone should have easy, free access to file archiving software. Get your FREE download of the #1, open source file archiver 7-Zip,now.
Why Do I Need 7-Zip?
7-Zip opens almost every type of file archive, including RAR, ZIP, ISO, and TAR. Click here for the full list. 7-Zip is also the perfect solution if you have to email large files or groups of files. Just open 7-Zip, drop in your files and 7-Zip can compress them into one small file.
Compare 7-Zip to WinZip and WinRAR
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