WD98: How to Clear the Undo Stack (181173)

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By design, you cannot turn off the Undo or Redo commands, nor can you change the maximum number of actions Word stores in the Undo or Redo stacks (up to approximately 100 or the total number of actions in one document). NOTE: If you are experiencing out-of-memory or slow-performance problems, be sure to rule out other Word or system operations as the cause.

To clear the Undo and Redo stacks in Word, use any of the following methods.

Method 1: Protect the Document for Forms

1. On the Tools menu, click Protect Document.
2. Under Protect Document For, click Forms.
3. Click OK.

NOTE: If you do not actually want to protect your document, click Unprotect Document on the Tools menu.

Method 2: Create and Use a Macro

Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements. The following sample Visual Basic for Applications macro clears the undo stack for the active document.

   Sub ClearActiveDocumentUndoStack()
      ActiveDocument.UndoClear
   End Sub
				

The following sample Visual Basic for Applications macro clears the undo stack for all open documents.

   Sub ClearAllDocumentsUndoStack()
      Dim oDocUndoStack as Object
      For Each oDocUndoStack In Application.Documents
         oDocUndoStack.UndoClear
      Next oDocUndoStack
   End Sub
				

For additional information, please see the following article in the Microsoft Knowledge Base: