7-Zip is open source software. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions.

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.

Features

  • High compression ratio in new 7z format with LZMA compression
  • Supported formats:
    • Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
    • Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, MSI, WIM, Z, CPIO, RPM, DEB and NSIS
  • 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 69 languages

What's New

  • 7-Zip now can unpack ZSTD archives (.zst filename extension).
  • 7-Zip now can unpack ZIP, SquashFS and RPM archives that use ZSTD compression method.
  • 7-Zip now supports fast hash algorithm XXH64 that is used in ZSTD.
  • 7-Zip now can unpack RAR archives (that use larger than 4 GB dictionary) created by new WinRAR 7.00.
  • 7-Zip now can unpack DMG archives that use XZ (ULMO/LZMA) compression method.
  • 7-zip now can unpack NTFS images with cluster size larger than 64 KB.
  • 7-zip now can unpack MBR and GDP images with 4 KB sectors.
  • Speed optimizations for archive unpacking: rar, cab, wim, zip, gz.
  • Speed optimizations for hash caclulation: CRC-32, CRC-64, Blake2sp.
  • The bug was fixed: 7-Zip for Linux could fail for multivolume creation in some cases.
  • Some bugs were fixed.