Maxiorel GUI4UPX is simple frontend for the well known Ultimate Packer for eXecutables, UPX. With this frontend you can choose file, set the compression ratio and run the process. You can decompress files too. There is a visible command for UPX. Since version 2.0 there is a possibility to process more than one file. With Maxiorel GUI4UPX you can create BAT file with prepared commands. It is very useful for developers.