Please Note: This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Excel, click here: Understanding Add-Ins.

Understanding Add-Ins

Written by Allen Wyatt (last updated April 29, 2023)
This tip applies to Excel 97, 2000, 2002, and 2003


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:

  • The program code cannot be altered by others.
  • The program code runs a bit quicker.
  • The add-in is available without needing to open any particular workbook.
  • The functions provided by the add-in appear to be a part of Excel.

    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, most add-ins modify the menu structure in some way so that the functions in the add-in can be accessed. Your macros should take care of the menu 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:

If you would like to know how to use the macros described on this page (or on any other page on the ExcelTips sites), I've prepared a special page that includes helpful information. Click here to open that special page in a new browser tab.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (2276) applies to Microsoft Excel 97, 2000, 2002, and 2003. You can find a version of this tip for the ribbon interface of Excel (Excel 2007 and later) here: Understanding Add-Ins.

Author Bio

Allen Wyatt

With more than 50 non-fiction books and numerous magazine articles to his credit, Allen Wyatt is an internationally recognized author. He is president of Sharon Parq Associates, a computer and publishing services company. ...

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