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 Web User guide to file compression

There are lots of different types of compressed file formats available and, in issue 155 of Web User, we conducted a group test of the programs you can use to compress and decompress them. But what's the difference between an ARJ and a ZIP? Refer to our table below to find out.


FormatFile extensionDescription
7z.7zExcellent compression level, requires (free) 7-Zip software
ARC.arcPrograms supporting this may open older archives but it's now rarely used to compress files in its own right
ARJ.arjAs above, programs supporting this may open older archives but it's now rarely used to compress files in its own right
BZIP2.bz2Good compression ratio but it's slower than ZIP and GZIP formats
GZIP.gzThe version of ZIP often used on Linux computers
LHA.lhaThe compression file format used on the Commodore Amiga, which was a popular home computer back in the 1980s
RAR.rarExcellent compression level but only available with WinRAR software. However, decompression can be achieved with other software
SIT.sitThe most popular compression format on Apple's computers though its compression ratio has been surpassed by modern standards
TAR.tarAn older file format, used in conjunction with other compression, that isn't seen very much any more
ZIP.zipThe file format most commonly used on Windows PCs that offers a decent balance between size, speed, ease of use and compatibility

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Welcome to Web User magazine's online home, where you'll find news, reviews and a buzzing forum. For the best websites, practical advice and the latest music and film downloads every fortnight, get Web User, the UK’s best selling internet magazine.
Claire WoffendenClaire Woffenden, Editor

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