Please Note: This article is written for users of the following Microsoft Word versions: 2007, 2010, 2013, 2016, 2019, 2021, 2024, and Word in Microsoft 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: Changing the Maximum Undo Levels.
Rob asked if there is a way to change the maximum number of undo levels in Word. The short answer is, no, you can't. The reason is that you don't need to—the only thing that limits the number of undo levels in Word is the amount of resources you have in your computer. This means that the number of undo levels in Word is, for all intents and purposes, unlimited. In fact, you can run a small macro to show that this is the case. Consider this macro:
Please Note:
This article is written for users of the following Microsoft Word versions: 2007, 2010, 2013, 2016, 2019, 2021, 2024, and Word in Microsoft 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: 
Sub TestUndo()
Dim J As Integer
For J = 1 To 5000
Selection.TypeText J
Selection.TypeParagraph
Next J
End Sub
It will take a few moments to run the macro, which inserts 5,000 numbers in your document, but when the macro is done, take a look at your undo stack (click on the down-arrow next to the Undo tool on the toolbar). You will notice that you can undo all 10,000 individual steps. (5,000 numbers and 5,000 new paragraphs.)
There are things, however, that will clear the undo stack. For instance, protecting a document for forms, executing the UndoClear method in a macro, or closing and reopening a document.
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 (11202) applies to Microsoft Word 2007, 2010, 2013, 2016, 2019, 2021, 2024, and Word in Microsoft 365. You can find a version of this tip for the older menu interface of Word here: Changing the Maximum Undo Levels.
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