tiny-upx is a simple frontend for UPX. It supports drag-and-drop from explorer and right-click explorer context menu.
UPX is a free, portable, extendable, high-performance executable packer for several executable formats.
1) Download UPX from http://upx.sourceforge.net/
2) Place upx.exe into same directory as tiny-upx.
3) Double click to run.
1) Drag files into window to pack.
2) For the context menu to work, you need to enable it from the right click menu.