7 Zip V9.20

7-Zip is an open source file archiver. 7-Zip operates with the 7z archive format, but can read and write several other archive formats. The program can be used from a command line interface, graphical user interface, or with a window-based shell integration. 7-Zip began in 1999^[1] and is actively developed by Igor Pavlov. The cross-platform version of the command line utility, p7zip, is also available.^[4]
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.^[5][6] It was the winner of the SourceForge.net 2007 community choice awards for "Technical Design" and for "Best Project".

The 7z archive format

Main article: 7z

By default, 7-Zip creates 7z format archives with a .7z file extension. Each archive can contain multiple directories and files. As a container format, security or size reduction are achieved using a stacked combination of filters. These can consist of pre-processors, compression algorithms, and encryption filters.
The core .7z compression uses a variety of algorithms, the most common of which are bzip2, LZMA2, and LZMA. Developed by Pavlov, LZMA is a relatively new system, making its debut as part of the 7z format. LZMA consists of a large LZ-based sliding dictionary up to 4 GB in size, backed by a range coder.^[8]
The native 7z file format is open and modular. All filenames are stored as Unicode.^[9]
The official 7z file format specification is distributed with the program's source code, in the 'doc' subdirectory.

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