
packing/unpacking support for 7z, ZIP, TAR, BZIP2, GZIP high compression ratio in 7z format using LZMA/LZMA2 compression

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The default 7z file format offers one of the highest compression ratio (using LZMA and LZMA2 - Lempel–Ziv–Markov chain algorithm an algorithm used for lossless data compression) that's why this app is probably the most popular free file archiver. You can use the program in three ways: from its graphical user interface (most popular), a command line interface or as a shell integration. The default archive format is 7z but it works (read and write) other popular archive formats. It is one of the best, free file archivers that comes with a high compression ratio.

7-Zip (also written as 7zip) is a free, open source (under GNU LGPL license) file archiver for Microsoft® Windows®.
