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7z Zip File Archiver Compressing Tool Full Free PC Version Download

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7z Zip Archive Info.

7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives". It is developed by Igor Pavlov and was first released in 1999.7-Zip uses its own 7z archive format, but can read and write several other archive formats. The program can be used from a command-line interface as the command p7zip,or through a graphical user interface that also features shell integration. Most of the 7-Zip source code is under the GNU LGPL license; the unRAR code, however, is under the GNU LGPL with an "unRAR restriction", which states that developers are not permitted to use the code to reverse-engineer the RAR compression algorithm.

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, PPMd, LZMA2, and LZMA. Developed by Pavlov, LZMA is a relatively new system, making its debut as part of the 7z format. LZMA uses an LZ-based sliding dictionary of up to 4 GB in size, backed by a range coder.

The native 7z file format is open and modular. File names are stored as Unicode.

In 2011 Top Ten Reviews found that the 7z compression was at least 17% better than ZIP,and 7-Zip's own site has since 2002 reported that while 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 other zip-compatible programs".

The 7z file format specification is distributed with the program's source code, in the "doc"

 sub directory.

Features

7-Zip supports:

The 256-bit AES cipher. Encryption can be enabled for both files and the 7z hierarchy. When the hierarchy is encrypted, users are required to supply a password to see the filenames contained within the archive. WinZip-developed Zip file AES encryption standard is also available in 7-Zip to encrypt ZIP archives with AES 256-bit, but it does not offer filename encryption as in 7z archives.

Volumes of dynamically variable sizes, allowing use for backups on removable media such as writable CDs and DVDs

Usability as a basic orthodox file manager when used in dual panel mode

Multiple-core CPU threading

Opening EXE files as archives, allowing the decompression of data from inside many "Setup" or "Installer" or "Extract" type programs without having to launch them

Unpacking archives with corrupted filenames, renaming the files as required

Create self-extracting single-volume archives

Command-line interface

Graphical user interface. The Windows version comes with its own GUI; however, p7zip uses the GUI of the Unix/Linux Archive Manager.

7-zip does not provide a way to control the file order inside archives. It ignores file name order in command line. Consequently, 7-zip is not usable in cases where the order of file names is important. For example, the EPUB format, which is based on Zip and HTML formats, requires a certain order of the files in archives: a file named "mime type" must be the first file in the ZIP archive.

Security

Self-extracting archives (including the executable installer of 7-Zip itself) are vulnerable to arbitrary code execution through DLL hijacking: they load and run a DLL named UXTheme.dll, if it is in the same folder as the executable file.7-Zip 16.03 Release notes say that the installer and SFX modules have added protection against DLL Pre loading attack.

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