Please Note: This article is written for users of the following Microsoft Word versions: 2007, 2010, 2013, 2016, 2019, and Word in Office 365. If you are using an earlier version (Word 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Word, click here: Clearing the Undo Stack in a Macro.
Normally, as you are making edits in your documents, Word keeps track of what you do. Word does this so you can later use the Undo and Redo commands on the toolbar. What if you are developing a macro, however, and you don't want the user to be able to undo changes? In this case, you can use the UndoClear method in your macro, as follows:
ActiveDocument.UndoClear
In this usage, UndoClear wipes out the Undo stack (the list of actions that is remembered by Word) for the active document. Note that this affects only those actions that have been recorded so far; any new actions will be duly recorded and available on the stack.
Note:
WordTips is your source for cost-effective Microsoft Word training. (Microsoft Word is the most popular word processing software in the world.) This tip (13275) applies to Microsoft Word 2007, 2010, 2013, 2016, 2019, and Word in Office 365. You can find a version of this tip for the older menu interface of Word here: Clearing the Undo Stack in a Macro.
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2020-11-17 09:24:26
Andrew
Malcom, if as I surmise your goal is not really to wipe the macro off the undo list but rather not to "litter" the undo list with all of the actions the macro carries you, you might want to look into collapsing the entire macro into a single event in the undo list using the Application,UndoRecord object and its .StartCustomRecord and .EndCustomRecord methods.
Andy.
2020-11-16 10:16:06
Malcolm
Wanting to prevent undoing the macro is one thing. If the macro could scramble the effect of earlier actions in the stack, it may be wise. Is it always necessary? How would you store the stack before executing the macro and restore the stack to that state afterwards?
2020-11-16 10:07:07
Malcolm
How would you store the stack before executing the macro and restore the stack to that state afterwards?
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Please Note:
This article is written for users of the following Microsoft Word versions: 2007, 2010, 2013, 2016, 2019, and Word in Office 365. If you are using an earlier version (Word 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Word, click here: 
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