It's easy for Windows users to forget that WinZip isn't the only file compression utility in the world. 7-Zip is the most powerful free zip utility for file compression, encryption, packaging & data backup. Why pay when its free?

About Us / Features

7-Zip is an open source file archiver designed originally for Microsoft Windows in 2000. Its Open Source sofware, released under the General Public License, and unlike some other file compression software, 7Zip is free to download, free to use, and does not require registration. 7-Zip is 100% Free

7-Zip has also received several awards including, SourceForge: The community choice awards for "Technical Design" and for "Best Project" - 2007. It has also recieved the five star cnet award in 2009.

7-Zip operates with the 7z archive format, and can read and write to several other archive formats. However where 7Zip stands out is with its 7z format. 7z archives are up to 40 percent smaller then their ZIP equivalents making 7zip the most powerful file compression tool available. The main features of the 7z format are:

* Open architecture
* High compression ratio
* Strong AES-256 encryption
* Ability of using any compression, conversion or encryption method
* Supporting files with sizes up to 16000000000 GB
* Unicode file names
* Solid compressing
* Archive headers compressing

7z has open architecture, so it can support any new compression methods. The following methods are integrated to 7z

* LZMA - Improved and optimized version of LZ77 algorithm
* LZMA2 - Improved version of LZMA
* PPMD - Dmitry Shkarin's PPMdH with small changes
* BCJ - Converter for 32-bit x86 executables
* BCJ2 - Converter for 32-bit x86 executables
* BZip2 - Standard BWT algorithm
* Deflate - Standard LZ77-based algorithm

LZMA is default and general compression method of 7z format. The main features of LZMA method are:

* High compression ratio
* Variable dictionary size (up to 4 GB)
* Compressing speed: about 1 MB/s on 2 GHz CPU
* Decompressing speed: about 10-20 MB/s on 2 GHz CPU
* Small memory requirements for decompressing (depend from dictionary size)
* Small code size for decompressing: about 5 KB
* Supporting multi-threading and P4's hyper-threading

7Zip also has some features to make life simpler for you including the ability to open EXE files as archives, allowing the decompression of data from inside many "Setup" or "Installer" or "Extract" type files without having to launch them. 7-Zip can also unpack archives with corrupted filenames, renaming the files as required.

7Zip is not only a very powerful file archiver, but its also 100% free and always will be. 7-Zip: Download it Free!


Freedom

You can use 7-Zip on any computer, including a computer in a commercial organization. 7Zip is free to download, free to use, and does not require registration. 7Zip - We believe in free software.

Installation

After you have downloaded the setup file, Double Click 7zipsetup.exe and the automated installation procedure will begin. 7Zip is now installed and ready for you to use. 7Zip - Download it free today!

System Requirements

Windows 98/ME/NT/2000/XP/Vista/Windows 7
Supported for Windows 32-bit and x64 Editions