7-Zip

7-Zip is a free, open-source file archiver with one of the highest compression ratios available. Its own 7z format (LZMA / LZMA2) typically compresses 30–70% better than ZIP, and it can open almost every archive type you will ever meet — ZIP, RAR, TAR, GZ, BZ2, XZ, WIM, ISO, CAB, MSI, DMG and more.

Key Features

• High compression ratio in 7z format with LZMA and LZMA2
• Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
• Unpacking only: RAR, ISO, CAB, ARJ, CHM, DMG, MSI, NSIS, UDF, VHD and many more
• Strong AES-256 encryption for 7z and ZIP archives
• Self-extracting (SFX) archives for 7z format
• Integrated file manager and Windows Explorer context-menu integration
• Command-line version and plugin for FAR Manager
• Completely free — no ads, no nag screens, no license needed even for business use

Why 7-Zip?

It is tiny (under 2 MB), extremely fast on modern multi-core CPUs and localised in 87 languages. The 64-bit installer is the recommended build for all current Windows PCs.

• Improved compression speed for LZMA2 on multi-core CPUs
• Support for newer ZIP and TAR extensions
• Bug fixes and stability improvements