I guess everyone already knows winrar, winzip and 7zip but it seems like most don't know the 7zip options you get just from looking around at a lot of file downloads. Just as example I used all 3 and several different methods of 7zip to compress the same rmmv game folder. The original size was 286 mb by the way. Winzip - 220 mb WinRar - 217 mb 7-zip standard settings - 210 mb 7-zip compression settings Ultra LZMA2 32mb- 209 mb 7-zip compression settings Ultra PPMD- 216mb So the winner by a long shot is 7-zip. If you are really desperate for maximum compression you can use the settings listed above. Also Winrar can extract 7zip files usually so you don't usually have to depend on the downloader to already have 7zip downloaded to extract it.