Free UPX is an advanced graphical interface for the UPX (Ultimate Packer for eXecutables). It allows you to compress (and decompress) files produced according to Microsoft Portable Executable and COFF Specification (EXE, DLL, OCX, BPL, CPL and other). It offers easy access to all documented and undocumented UPX parameters without the need for command line usage. The Free UPX interface is very simple and user-friendly. To compress executable files, just drag & drop them into main window, select proper profile from list, and click the compress button. Current version supports 64-bit executable files (Win64/PE), but this feature is declared as experimental.
Windows Server 2008