What software is 7-zip?

7-Zip is an open source data compression program. It is a free and open source compression software released based on the GNU LGPL protocol. It is mainly used in Windows operating systems; it provides command line interface programs or graphics User interface program, and can be combined with the resource manager. 7-Zip not only supports the unique 7z file format, but also supports a variety of other compressed file formats, including ZIP, RAR, CAB, GZIP, BZIP2, and TAR.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

7-Zip is an open source data compression program, mainly used in Microsoft Windows operating systems. Unix-like operating systems such as Linux and FreeBSD have a transplanted version of 7-zip, p7zip, that can be used. It provides a command line interface program or a graphical user interface program, and can be combined with the resource manager.

#7-Zip is a completely free and open source compression software. It has a higher compression ratio than other software and does not consume a lot of resources compared to WinRAR.

7-Zip is free software. It was developed by Igor Pavlov in 1999 and released the main body under the GNU LGPL; the encryption part uses the code of the Advanced Encryption Standard (AES). Distributed under a BSD license; unpack the RAR parts and use the RAR-specific license.

7-Zip’s current main competitors in the market are WinZip and WinRAR, both of which are proprietary software. 7-Zip is also the most popular open source compression program currently.

7-Zip was voted the "Best Technical Design" and "Best Project" by the SourceForge.net community in 2007.

Software advantages

• Open source, free, lightweight and portable. The functions are equivalent to similar paid software

• For ZIP and GZIP formats, 7-Zip can provide a 2-10% higher compression ratio than using PKZip and WinZip

• Provide a more complete AES-256 encryption algorithm; you can use 7-zip built-in commands to create compact automatic release installation packages

• Tightly integrated with Windows Explorer; powerful file manager; a more powerful command line version; supports FAR Manager plug-in;

• supports compression/compression of 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM formats Unzip!

• Unzip only: ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS , RAR, RPM, SquashFS, UDF, VHD, WIM, XAR, Z

7-Zip's default format is its self-developed 7z format, with the extension .7z. The 7z format contains a variety of algorithms, the most commonly used ones are Bzip2 and LZMA developed by the author Igor Pavlov. The LZMA algorithm is relatively new compared to other common traditional compression algorithms, such as Zip and RAR, and has a relatively high compression rate. The 7z format supports Unicode and is used by default to store file names, which can avoid the problem of garbled compression and decompression between different systems and language environments. Most of the currently popular compression programs support this function, such as WinRAR, 7-Zip, and Peazip.

Other supported formats and calculation methods

7-Zip supports many compressed/uncompressed file formats, including ZIP, CAB, RAR, ARJ, Z, gzip, bzip2, LLHA, tar, cpio, RPM. CD/DVD image file format ISO is supported starting from version 4.42, and ACE is no longer supported due to copyright issues. Starting with 7-Zip 9.14 beta, 7-Zip can open and decompress VHDs.

Features

• The 7-zip file itself has many features:
  • 256-bit AES encryption
  • Multi-threaded compression & Decompression
  • LZMA (2) compression strength is much higher than ZIP DEFLATE, and the speed and compression strength are slightly higher than RARv3.
  • Supports dynamic file size (volume) compression, which is very effective for backup to removable media such as CD and DVD
• Supports FAR Manager plug-in
• Supported 79 languages ​​(including English, Chinese (Simplified, Traditional), Japanese, Korean)
• Compared with paid WinRAR and WinZip, it provides more file type decompression support, such as exe segment reading.
• 7-Zip has the ability to create self-extracting archives (SFX)
  • WinRAR and HaoZip based on 7-Zip LZMA SDK both provide wizard-style self-extracting front ends, but 7-zip does not support it.
• 7-Zip has the ability to decompress compressed files with incorrect file names. If necessary, the file can be renamed
• 7-Zip supports Descript.ion style file comments
• Note: When setting file type associations for all users, administrator rights are required (right-click to open administrator rights).

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