7-Zip is a file archiver with high compression ratio.

License

7-Zip is open source software. Most of the source code is under GNU LGPL license. AES code is under BSD LICENSE. unRAR code is under mixed license: GNU LGPL + unRAR restriction.

You can use 7-Zip on any computers, including computers in commercial organizations. 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

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High compression ratio in new 7z format with LZMA compression
Supported formats:
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Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS
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For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 % better than ratio provided by PKZip and WinZip
Self-extracting capability for 7z format
Integration with Windows Shell
Powerful File Manager
Powerful command line version
Plugin for FAR Manager
Localizations for 63 languages
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7-Zip

7-Zip works in Windows 98/ME/NT/2000/XP.

Compression ratio

We compared 7-Zip with some of the leading archivers.

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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