Checks if the specified window exists and is currently active (foremost).

UniqueID := WinActive(WinTitle, WinText, ExcludeTitle, ExcludeText)



Type: String, Integer or Object

A window title or other criteria identifying the target window. See WinTitle.


Type: String

If present, this parameter must be a substring from a single text element of the target window (as revealed by the included Window Spy utility). Hidden text elements are detected if DetectHiddenText is ON.


Type: String

Windows whose titles include this value will not be considered.


Type: String

Windows whose text include this value will not be considered.

Return Value

Type: Integer

This function returns the Unique ID (HWND) of the active window if it matches the specified criteria, or 0 if it does not.

Since all non-zero numbers are seen as "true", the statement if WinActive(WinTitle) is true whenever WinTitle is active.


If all parameters are omitted, the Last Found Window will be used.

If the active window is a qualified match, the Last Found Window will be updated to be the active window.

An easy way to retrieve the unique ID of the active window is with ActiveHwnd := WinExist("A").

Window titles and text are case sensitive. Hidden windows are not detected unless DetectHiddenWindows has been turned on.


WinExist, SetTitleMatchMode, DetectHiddenWindows, Last Found Window, WinActivate, WinWaitActive, WinWait, WinWaitClose, #HotIf



if WinActive("Untitled - Notepad")
    WinMaximize  ; Maximizes the Notepad window found by WinActive above.
    Send "Some text.{Enter}"


if WinActive("ahk_class Notepad") or WinActive("ahk_class" . ClassName)  ; "ahk_class" need not have a space after it.
    WinClose  ; Uses the last found window.