7-Zip is an open-source file archiver, an application used primarily to compress files. 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, graphical user interface, or with a window-based shell integration.

Features:

• High compression ratio in 7z format with LZMA and LZMA2 compression.
• Supported formats.
  • Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM.
  • Unpacking 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 WinZip.
• Strong AES-256 encryption in 7z and ZIP formats.
• Self-extracting capability for 7z format.
• Integration with Windows Shell.
• Powerful File Manager.
• Powerful command line version.
• Plugin for FAR Manager.
• Localizations for 87 languages.