This article was previously published under Q211317
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This article contains several methods for clearing the Undo stack in Microsoft Word.
You cannot turn off the Undo or Redo commands, nor can youchange the maximum number of actions Word stores in the Undo or Redo stacks (limited by resources and document size)(maximum document size of 32 megabytes without graphics).
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
On the Tools menu, click Protect Document.
Under Protect document for, click Forms.
NOTE: If you do not actually want to protect your document as a form, click Unprotect Document on the Tools menu.
Method 2: Create and Use a Macro
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For more information about the support options that are available and about how to contact Microsoft, visit the following Microsoft Web site:http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS For more information about how to use the sample code in this article, clickthe article number below to view the article in the Microsoft Knowledge Base:
212536 OFF2000: How to Run Sample Code from Knowledge Base Articles
The following sample Visual Basic for Applications macro clears the Undostack for the active document.
Sub ClearActiveDocumentUndoStack() ActiveDocument.UndoClear End Sub
The following sample Visual Basic for Applications macro clears the undostack for all open documents.
Sub ClearAllDocumentsUndoStack() Dim oDocUndoStack as Object For Each oDocUndoStack In Application.Documents oDocUndoStack.UndoClear Next oDocUndoStack End Sub