7zip

7Zip-4.42

         7-Zip is a file archiver with high compression ratio which is well known for its 7z compression format. Available for 32-bit as well as 64-bit windows operating systems, 7 Zip is an effective compression utility. The compression ratio is claimed to be 2% to 10% better than the ratio provide by PK-Zip and WinZip. It also supports command line control with in Linux .Files compressed in the 7zip format tend to be 30 to 50% smaller than the corresponding zip file. Compression ratio results are depending up on the data used for the tests. Usually 7zip compresses to 7z format 30 – 70% better than the zip format.

   7-ZIP supports around 15 compression formats. Currently 7-Zip supports the following archive formats: 7z, ZIP, GZIP, TAR, BZIP2, RAR, CAB, ARJ, Z, CPIO, RPM, DEB, LZH, SPLIT and CHM .[Italics shows only for browsing and decompression].

 7z Format:

   The main features of the 7z formats are; 1.Open source architecture 2.High compression ratio  3. Strong AES -256 encryption. 4. Ability of using any compression. 5. Supporting files with sizes up to 16000000000GB. 6. Unicode file names 7. Solid compressing 8. Archive headers compressing.7zip has open architecture, so it can support new compression methods.

 
 The user interface gives a comfortable feel and it is self explanatory which is easy to use for novice.7zip works in Windows 98/ME/NT/2000/XP.There is also a version for Linux/Unix.7zip, except for the file Rar29.dll, is free software distributed under the GNU Lesser Public License, ver. 2.1. The file29.dll is under a mixed license, as it is a re-create the RAR compression algorithm, which is proprietary.

 For: It is very easy to use just right click on a file and a simple user interface.

Against: While compressing a file or folder it will only do it in 7z format (its proprietary format).

 

Website: www.7-zip.org

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