I use WinRAR most of the time because it's free and have been using it since the beginning of i am using computer and it's been really helpful. Both WinRAR or WinZip will develop the best possible algorithm to do the compression process, they don't have much different in the results. Zip is the most widely used and probably the most effective format for compressed file. How small they can reduce the file size is depends on your files you want to compress and the format of compression you want to choose. WinZip: 21 day free trial, after that must buy the licence

WinRAR: Forever free to use, only popup to upgrade will appear WinZip: ZIP, ZIPX, RAR, 7Z, CAB, TAR, GZip, ISO, Z, XZ, LZH, BZ2, VHD, VMDX WinRAR: RAR, ZIP, 7Z, CAB, ARJ, LZH, TAR, GZip, UUE, ISO, BZ2, Z, GZ, JAR, LZ, XZ, ZIPX, OO1 zip: 1,494,035 KB with 1 minute 8 seconds zip: 1.494,843 KB and 1 minute 8 seconds I tested today with the latest version of WinRAR and WinZip, to zip and unzip the same files, and this is the results WinZip: The easiest way to zip, unzip, protect and share your files WinRAR: Compress, Encrypt, Package and Backup with only one utility

The two programs for doing file compression i know is WinRAR and WinZip, so here's a comparison of the two most popular compression tools. And also the compression file working to reduce the size when it's being warped into ZIP or RAR format, so the size is much smaller than if don't compressed it. We deal with compressed files a lot, from flash disk, downloading from the internet and many other source because with compressed file either ZIP or RAR, we distributed many files into single file. WinZip or WinRAR has already proven both have to be the best tool to dealing with file compression and decompression, both work perfect. For compression and extracting file in Windows, we need good program that is especially fast and not make your file become corrupt or unusable.

Winzip winrar