Hi and welcome When you use the EXE outside of the compiler, it need to have some DLLS in order to run. (in the same folder as the exe) please see http://doc.qt.io/qt-5/deployment.html for short list http://www.bogotobogo.com/Qt/Qt5_Deploy_Windows_Plugins_Platforms_qwindows.php and for the best: http://www.tripleboot.org/?p=138 You can also use http://www.dependencywalker.com/ to cast some light one if you need other dlls.