@Nils-Sjoberg thats work normally. I always use it for release windeployqt.exe C:\Users\B\Desktop\Projects\MyApp\build\MyApp\ worked : (windeployqt6.exe C:\Users\B\Desktop\Projects\MyApp\build\MyApp\MyApp.exe) What is the different windeployqt.exe and windeployqt6.exe ? also windeployqt.exe --webenginecore C:\Users\B\Desktop\Projects\MyApp\build\MyApp\ //or windeployqt.exe --webenginewidgets C:\Users\B\Desktop\Projects\MyApp\build\MyApp\ working

So if anyone finds the same issue, the workaround can be found here: https://github.com/probonopd/linuxdeployqt/issues/554 I just put the line: qputenv("QTWEBENGINE_CHROMIUM_FLAGS", "--disable-gpu --no-sandbox"); And everything started to work.