UPX Tool UPX Tool is a free GUI for the existing UPX software, which lacks one.

UPX is a command-line tool that can significantly reduce the size of both EXEs and DLLs, allowing more programs to be packed onto a USB drive. No additional software is required for the compressed EXEs or DLLs to work. An additional benefit is a potentially faster loading program due to fewer read cycles to load the EXEs/DLLs. UPX Tool is a GUI wrapper for UPX for the command-line intimidated.