Changing DPI scaling size of display make Qt application’s font size get rendered bigger
High DPI support is enabled from Qt 5.6 onward. Setting QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling) in your application source code allows automatic high-DPI scaling. NOTICE: To use the attribute method, you must set the attribute before you create your QApplication object: #include <QApplication> int main(int argc, char *argv[]) { QApplication::setAttribute(Qt::AA_EnableHighDpiScaling); QApplication app(argc, argv); return app.exec(); }