7-Zip is a file archiver with a high compression ratio. You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. 7-Zip works for Windows 7, Vista, XP, 2008, 2003, 2000, NT, ME, and 98. And there is a port of the command line version to Linux/Unix. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license with GNU LGPL + unRAR restrictions. Check the license for details.

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Editor's Review

7-Zip is a file archiver with a high compression ratio for ZIP and GZIP formats, which is between 2 to 10% better than its peers, depending on the exact data tested. And 7-Zip boosts its very own 7z archive format that also offers a significantly higher compression ratio than its peers—up to 40% higher! This is mainly because 7-Zip uses LZMA and LZMA2 compression, with strong compression settings and dictionary sizes, to slow but vastly improve density. If a zip tool gains its appeal from its ability to efficiently compress files, then 7-Zip proves it has a little bit o’ magic.

7-Zip at a Glance

After you effortlessly download and launch 7-Zip, you’ll quickly discover its simple and easy to navigate interface. The main toolbar contains 7-Zip’s most used features and there are several menus that allow you to dig deeper within. For example, the Extract button lets you easily browse for or accept the default destination directory for your file, while the View menu contains a Folder History, and the Favorites menu lets you save up to ten folders. 7-Zip also integrates with the Windows Explorer menus, displaying archive files as folders and providing a toolbar with drag-and-drop functions. You can also alternate between a single or dual-pane view.

Product Details

7-Zip offers several features that make it one of the best compression software options around. For example:

  • Open architecture—The source code uses the GNU LGPL license, while the unRAR code is under a mixed license with GNU LGPL + unRAR restrictions.
  • High compression ratio—Using its own 7z format with LZMA and LZMA2 compression, 7-Zip’s compression ratio is up to 40% higher than its peers. For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10% better than PKZip and WinZip.
  • Strong AES-256 encryption—This includes both password protection of files and encryption of file names.
  • Ability to use may compression, conversion, or encryption methods—For example 7-Zip:
    • Supports packing and unpacking for 7z, XZ, BZIP2, GZIP, TAR, ZIP, and WIM.
    • Supports unpacking only for ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR, and Z.
    • Supports a self-extracting capability for 7z format.
  • Integrates with Windows Shell—Using its menu options, you can integrate 7-Zip to the Windows Shell menu.
  • Powerful file manager and command line versions—There’s also a plugin for FAR Manager.
  • Localizations for 79 languages—This kind of support is why 7-Zip is the world’s favorite free compression software.

Pros

Cons

7-Zip is easy to download and use, it opens and compresses most everything, and is has a Windows shell extension. The interface is a little sparse and so are the instructions, but the program works like a charm anyway.

Quick Specs

  • Version: 9.22
  • Date added: March 2, 2013
  • Operating systems: Windows
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User Reviews

  • version 17.12 stable should be released now...humbly request... year 2017 is ending...now... waiting for stable relese of v.17 ...seriously ...i wan't it... i need it...

    1 user found this review helpful.
  • Still no answer to our technical question.... How can we send you a photo which explains the problem?

  • Far from being unusual, the information blackout, I mean + my question is so pertinent the more I scratched around looking for an answer the more I realized how it was just being avoided, certainly in a couple of tutorials I looked at which I'd hoped would spill the beans but didn't give what I wanted to know away. Anyway, you compress a file, size obviously being a concern, yet once it's 'zipped' how you find out it's new, + hopefully smaller, size I still couldn't tell you, which frankly, is ridiculous. I'm sure you can find out the size once it's been compressed, it's such a clearly necessary + relevant piece of information it's surprising it should be such a mystery, what isn't, is my inability to find a source where I might find an answer, information is very often hard to find in the field of 'Information Technology', I'd say, maybe I just look in the wrong places????

  • hilarious! the download for 7zip is in the 7zip format. i can install it as long as i have 7zip already installed. what genius did this?

  • The range of features and compression capability is out of question, also it is under 2 MB after installation so 7zip is just a MUST. However, developers here are just doing what they want without listening to features required by users (In my opinion that's the reason why other zip utilities are more popular), I imagine they spending nights for gaining 1% compression rate wihtou increasing usability (seriously, I can't imagine why no one forked 7zip to redesign it a bit). Issues: 1) Most websites (95%) provide only Md5 and Sha-1 checksums (because are cheaper I guess), those checksums are not secure as Sha-256, but if 7zip does not provide any checksums for those websites then the result is that user cannot do checksum wich is totally safeless (seein developers answering "install a Md5 utility" is a bit irritating). Also if the excuse for not adding MD5 and SHa-1 is that they are not secure, then just remove CRC too (wich is redundant since downloads from TCP connections already have CRC at TCP protocol level). 2) Allow copypasting to clipboard of checksums of file manager for make comparing easy 3) File manager is obsolete, use native folder browsing for each OS, it is much faster reliable and also make possible to users make use of their shortcuts and settings (this is also a question of accessibility, what if someone is using bigger fonts because visually impaired while 7 zip file manager still have small fonts? that force him to use the magnifier). 4) Allow decompression of tar.gz at once with 1 command. How difficult is wrap 2 sequential commands as 1?

    1 user found this review helpful.
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Additional Project Details

Languages

English

Intended Audience

System Administrators, Developers, End Users/Desktop

User Interface

Win32 (MS Windows), Command-line

Programming Language

C++, C

Registered

2000-11-10