Subtitle doesn't make sense, don't try to find one. Seems everyone has a version of this function. Here's another one. This one is trick free and it's mine, mine, mine... #AutoIt3Wrapper_Au3Check_Parameters=-d -w 1 -w 2 -w 3 -w 4 -w 5 -w 6 #include <WinAPI.au3> ; Make GUI GUICreate("StringSize", 600, 400) GUISetBkColor(0) ; black magic GUI ; First example: Global $sLabelText = "Pa Da Pam Pam..." Global $aLabelTextSize = _StringSize($sLabelText, 14) GUICtrlCreateLabel($sLabelTe