7-Zip is open source software. Means you it’s Free. 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.

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.

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

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