Free 7-Zip 9.25

7-Zip is a file archiver with a high compression ratio. Usually, 7-Zip compresses to 7z format 30-70% better than to zip format. High compression ratio in new 7z format with LZMA compression. Supported formats - Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR. Unpacking only: 7z, ZIP, RAR, GZIP, GZ, BZIP2, BZ2, TAR, CAB, ISO, ARJ, LZH, LHA, CHM, MSI, WIM, Z, CPIO, RPM, DEB, CPIO, DMG, FAT, HFS, LZMA, NTFS, SPLIT, SWM, TAZ, TBZ, TBZ2, TGZ, TPZ, VHD, XAR, XZ, Z 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. Self-extracting capability for 7z format. Integration with Windows Shell. Powerful File Manager. Localizations for 70 languages.

Powerful command line version

• Plugin for FAR Manager
• 7-Zip works in Windows 98/ME/NT/2000/XP/Vista. There is a port of the command line version to Linux/Unix.
• Compression ratio results are very dependent upon the data used for the tests.

The main features of 7z format:

• Open architecture
• High compression ratio
• Strong AES-256 encryption
• Ability to use any compression, conversion or encryption method
• Supports files with sizes up to 16000000000 GB
• Unicode file names
• Solid compression
• Archive header compression

7z has an open architecture, so it can support any new compression method, too. The following methods currently are integrated into 7z:

• LZMA - Improved and optimized version of LZ77 algorithm
• PPMD - Dmitry Shkarin's PPMdH with small changes
• BCJ - Converter for 32-bit x86 executables
• BCJ2 - Converter for 32-bit x86 executables
• BZip2 - Standard BWT algorithm
• Deflate - Standard LZ77-based algorithm

LZMA is the default and general compression method of 7z format. The main features of LZMA are:

• High compression ratio
• Variable dictionary size (up to 4 GB)
• Compression speed: about 1 MB/s on 2 GHz CPU
• Decompression speed: about 10-20 MB/s on 2 GHz CPU
• Small memory requirement for decompression (depend from dictionary size)
• Small code size for decompression: about 5 KB
• Supports multi-threading and P4's hyper-threading

OS : Windows 2000/XP/Vista/7
Size :1 MB