| 7-Zip7-Zip is a file archiver with a high compression ratio. Download 7-Zip 18.01 (2018-01-28) for Windows: 
  
    | Link | Type | Windows | Size |  
    | Download | .exe | 32-bit x86 | 1 MB |  
    | Download | .exe | 64-bit x64 | 1 MB |  License7-Zip is free software with open source. 
The most of the code is under the GNU LGPL license.
Some parts of the code are under the BSD 3-clause License. 
Also there is unRAR license restriction for some parts of the code.
Read 7-Zip License information. 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. The main features of 7-Zip
  High compression ratio in 7z format with LZMA and LZMA2 compressionSupported formats:
    
     Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIMUnpacking only: AR, ARJ, CAB, CHM, CPIO, CramFS, DMG, EXT, FAT, GPT, HFS,
                       IHEX, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, QCOW2, RAR, 
                       RPM, SquashFS, UDF, UEFI, VDI, VHD, VMDK, WIM, XAR and Z.For ZIP and GZIP formats, 7-Zip provides a compression ratio that 
      is 2-10 % better than the ratio provided by PKZip and WinZipStrong AES-256 encryption in 7z and ZIP formatsSelf-extracting capability for 7z formatIntegration with Windows ShellPowerful File ManagerPowerful command line versionPlugin for FAR ManagerLocalizations for 87 languages 7-Zip works in Windows 10 / 8 / 7 / Vista / XP / 2016 / 2012 / 2008 / 2003 / 2000 / NT. p7zip - the port of the command line version of 7-Zip to Linux/Posix. On 7-Zip's SourceForge Page 
you can find a forum, bug reports, and feature request systems. Compression ratioWe compared 7-Zip with WinRAR 5.20. FILE SETS: Mozilla Firefox 34.0.5 for Windows and Google Earth 6.2.2.6613 for Windows. 
  
    | Archiver | Mozilla Firefox | Google Earth |  
    | 65 files 85 280 391 bytes
 | 483 files 110 700 519 bytes
 |  
    | Compressed size | Ratio | Compressed size | Ratio |  
    | 7-Zip 9.35 -mx
 | 39 357 375 | 100% | 15 964 369 | 100% |  
    | WinRAR 5.20 -m5 -s -ma5 -md128m
 | 41 789 543 | 106% | 17 035 432 | 107% |  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 of other zip compatible programs. | 
 
 
 
 
 
 
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