Likewise, RAR is better at compression than ZIP, but it, too, requires other software prior to use, even for simple data extractiondecompression. However, the file extensions required for newer compression methods, which are not supported in any operating system by default, mean you may sacrifice accessibility when using them to share files. These algorithms are much better at compressing files than the default ZIP method, which is fast but uses older and less efficient DEFLATE compression. Text files can be compressed considerably, for example, but multimedia files, like MP3s or AVIs, may already be in a compressed state, meaning further compression may decrease folder or file size only slightly.įor example, the program 7-Zip can use LZMA and LZMA2 compression algorithms, which result in a.7z file extension. Some programs or settings prioritize speedhow quickly compression can be completedwhile others sacrifice speed to focus on achieving a smaller file size. RAR is not an open format because while decompression source code is available, it must not be used to reverse engineer the RAR compression algorithm. It was developed by a Russian software engineer, Eugene Roshal, and the RAR software is licensed by win.rar GmbH.
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