Forces the specified window to close.

WinKill WinTitle, WinText, SecondsToWait, 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: Integer or Float

If omitted or blank, the function will not wait at all. If 0, it will wait 500ms. Otherwise, it will wait the indicated number of seconds (can contain a decimal point or be an expression) for the window to close. If the window does not close within that period, the script will continue.


Type: String

Windows whose titles include this value will not be considered.


Type: String

Windows whose text include this value will not be considered.

Error Handling

An exception is thrown if the window could not be found, except if the group mode is used.

No exception is thrown if a window is found but cannot be closed, so use WinExist or WinWaitClose if you need to determine for certain that a window has closed.


This function first makes a brief attempt to close the window normally. If that fails, it will attempt to force the window closed by terminating its process.

If a matching window is active, that window will be closed in preference to any other matching window. In general, if more than one window matches, the topmost (most recently used) will be closed.

This function operates only upon a single window except when WinTitle is ahk_group GroupName, in which case all windows in the group are affected.

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


WinClose, WinWaitClose, ProcessClose, WinActivate, SetTitleMatchMode, DetectHiddenWindows, Last Found Window, WinExist, WinActive, WinWaitActive, WinWait, GroupActivate



if WinExist("Untitled - Notepad")
    WinKill ; use the window found above
    WinKill "Calculator"