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7-Zip Portable is the popular 7-Zip packaged as a portable app, so you can
take your file archiver with you and work with your compressed 7z, ZIP, GZIP,
BZIP2, TAR, RAR files and more on the go. You can place it on your USB flash
drive, portable hard drive or a CD and use it on any computer, without leaving
any personal information behind.

Features

7-Zip is a file archiver (compression) utility for Windows with a great array of
features including:

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, Z, CPIO, RPM, DEB
and NSIS

For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 %
better than ratio provided by PKZip and WinZip
Self-extracting capability for 7z format
Powerful File Manager
Localizations for 63 languages