MS Excel: Set up a cell to only allow up to a certain number of characters in Excel 2011 for Mac
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Question: In Excel 2011 for Mac, I want to set up a cell to only allow up to 15 characters. How can I do this?
Answer: Select the cells that you wish to restrict to a certain number of characters. In this example, we've selected cells A2 to A9.
Select the Data tab in the toolbar at the top of the screen. Then click on the Validate drop-down and select Data Validation from the popup menu.

When the Data Validation window appears, set up your criteria. In this example, we've setup the cells to allow a text length of less than or equal to 15.
Next, click on the Error Alert tab.

Enter an Error message to appear when data entered does not conform to the validation rules.

Now if a value is entered in one of those cells that is longer than 15 characters, the following error message will appear:
