WinRAR is a tiny, but powerful archiver that can reduce the size of files and folders. This program uses its proprietary RAR format, which provides better compression than ZIP. WinRAR can compress files and folders into both RAR and ZIP archives. It can also be used to unpack a variety of other formats including CAB, ARJ, LZH, TAR, GZ, UUE, BZ2, JAR, ISO, 7Z, XZ, and Z.