Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, 2016, 2019, 2021, 2024, and Excel in Microsoft 365. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: Understanding Add-Ins.
Written by Allen Wyatt (last updated June 14, 2025)
This tip applies to Excel 2007, 2010, 2013, 2016, 2019, 2021, 2024, and Excel in Microsoft 365
Many features of Excel are available only through what are called add-ins. For instance, the Analysis ToolPak is a good example of an add-in. The tools available in add-ins such as the Analysis ToolPak are not part of the basic Excel system, but can be added to the system as needs dictate. These add-ins are nothing more than programs which have been "added to" Excel in such a way that they appear to be part of Excel itself.
You also know that macros are nothing more than programs that you write using a language understood by Excel. These programs instruct Excel to perform tasks that otherwise might be time consuming or repetitious on your part. These programs, if elaborate enough, can become full-fledged applications that operate under Excel.
Excel allows you to translate your macro programs into add-ins, which can become part of Excel—the same as the Analysis ToolPak and others. Eventually you might want to take advantage of this capability. The files you convert to add-ins do not need to be elaborate, nor do they have to be fancy. Converting them to add-ins does have several advantages, however:
In essence, add-ins are nothing but a special type of workbook which you have converted to an add-in format that is understood by Excel.
You may want to make sure your macro code which is destined to be an add-in performs some initializing routine that modifies, in some way, the Excel user interface. For instance, an add-in may modify the ribbon structure used by Excel or it may add a selection to the Quick Access Toolbar so that the functions in the add-in can be accessed. Your macros should take care of the interface modification so that people can access your add-ins. If you don't modify the interface in some way, then users can only get to the macro code in your add-in by directly referencing in a worksheet formula the names of any functions in your add-in.
Note:
ExcelTips is your source for cost-effective Microsoft Excel training. This tip (8527) applies to Microsoft Excel 2007, 2010, 2013, 2016, 2019, 2021, 2024, and Excel in Microsoft 365. You can find a version of this tip for the older menu interface of Excel here: Understanding Add-Ins.
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2025-06-14 15:04:23
J. Woolley
Re. add-ins, the Tip says: "The program code cannot be altered by others."
Unless the add-in is protected in some way, anyone who installs an add-in can modify the code. For example, I installed "Solver Add-in" (SOLVER.XLAM); its code was password protected so I could not see or modify it. Ditto for "Analysis ToolPak - VBA" (ATPVBAEN.XLAM). However, installing "Analysis ToolPak - VBA" also installed FUNCRES.XLAM; its code was not password protected, so I was able to modify it. When I tried to save the modified version I was informed the file is read-only, but I was able to save an "unsigned" version as FUNCRES.xlsm; on the other hand, I could have simply copied all or some of the modified code to a module in another workbook (.xlsm) or add-in (.xlam).
My Excel Toolbox is available as an add-in (MyToolbox.xlam) which is unsigned and unprotected; however, modifications should be carefully considered.
See https://sites.google.com/view/MyExcelToolbox
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Please Note:
This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, 2016, 2019, 2021, 2024, and Excel in Microsoft 365. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here:
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