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License
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. But you can make a donation to support further development of 7-Zip.
The main features of 7-Zip
- High compression ratio in new 7z format with LZMA compression
- Supported formats:
- Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
- Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, MSI, WIM, Z, CPIO, RPM, DEB and NSIS
- 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 69 languages
7-Zip works in Windows 98/ME/NT/2000/XP/Vista. 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.
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