7-Zip is a file archiver with a high compression ratio. 7-Zip operates primarily with the 7z archive format, as well as being able to read and write to several other archive formats. In operation a user can use the command line, graphical user interface or Windows shell integration. 7-Zip creates fully ZIP compatible archives. Anyone can decompress these files by any ZIP compatible decompression utility. In contrast to the market-leading programs WinZip and WinRAR, which remain as proprietary competitors, 7-Zip is distributed under the terms of the GNU Lesser General Public License (LGPL) (with the unRAR license restrictions), and as such is free software (excluding the non-free RAR code).

7-Zip also supports encryption with the AES-256 algorithm. This algorithm uses a cipher key with length of 256 bits. To create the key, 7-Zip uses a derivation function based on an SHA-256 hash algorithm. A key derivation function produces a derived key from a text password defined by the user. To increase the cost of an exhaustive search for passwords, 7-Zip uses a big number of iterations to produce the cipher key from the text password. 7-Zip provides superior decompression speed for RAR archives. For solid archives it decompresses only the minimum number of files needed.

Main features:

» High compression ratio in new 7z format with LZMA compression
» Support 7z, ZIP, GZIP, BZIP2 and TAR (Packing / unpacking), RAR, CAB, ISO, ARJ, LZH, CHM, MSI, WIM, Z, CPIO, RPM, DEB and NSIS (Unpacking only)
» 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

Size : 3.5 MB

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