Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, 2016, 2019, and 2021. 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: Develop Macros in Their Own Workbook.
Written by Allen Wyatt (last updated August 16, 2024)
This tip applies to Excel 2007, 2010, 2013, 2016, 2019, and 2021
Excel includes VBA as a powerful programming language that you can use to develop all sorts of macros. It is not unusual, as you are developing macros, to go through many iterations and make wholesale changes to your macros. You may want to keep in mind, however, that doing so can cause problems in your workbooks.
As you make changes to macros, adding and removing code, the actual file used to store the macros (the workbook) can get quite fragmented. It seems that internally the macros are stored in blocks and, much like a disk drive, the blocks can become "non-contiguous" over time. (This happens only through editing, not through use of the macros themselves.) Some readers have reported that there are times the fragmentation can get so bad that the macros may fail or the workbook become unusable.
The solution to this potential problem is to do your macro development in a different workbook than the one that will eventually hold the macros. Thus, when the macro is transferred to its final home, it will be transferred as a contiguous block, rather than being fragmented.
If you want to make sure that the macro fragmentation is completely removed from a current workbook, all you need to do is export your VBA modules to text files, create a brand new workbook, and import the modules into it.
Note:
ExcelTips is your source for cost-effective Microsoft Excel training. This tip (10351) applies to Microsoft Excel 2007, 2010, 2013, 2016, 2019, and 2021. You can find a version of this tip for the older menu interface of Excel here: Develop Macros in Their Own Workbook.
Dive Deep into Macros! Make Excel do things you thought were impossible, discover techniques you won't find anywhere else, and create powerful automated reports. Bill Jelen and Tracy Syrstad help you instantly visualize information to make it actionable. You’ll find step-by-step instructions, real-world case studies, and 50 workbooks packed with examples and solutions. Check out Microsoft Excel 2019 VBA and Macros today!
As you format your worksheet, Excel allows you to add page breaks where you'd like. If you want to put in a series of ...
Discover MoreOn your system you may have workbooks that contain macros you know are safe to use. Microsoft provides two things you can ...
Discover MoreWith a little bit of work, Excel allows you to format individual characters of the text you place in a cell. If you want ...
Discover MoreFREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."
2024-08-16 09:15:37
Brian
A slightly simpler way is to create a new module in the VBA editor, select the code then cut/paste it from the old module to the new one and then delete the old module. It's my understanding that when the new module is compiled it will be contiguous.
2021-02-11 08:08:31
mechie
In response to J Woolley - I have a few spreadsheets that are now over a decade old. The macros within them have continued to grow and have been edited periodically. Some of these sheets started with Excel ver 2003 as I recall (xlt). They have been .xltm workbooks every since we moved onto Excel 2007/2010. (Currently on ver 365.) I don't know if any of my updating over the years might have 'reset' the macros / vba, but I'm doubtful. I haven't noticed any issues as discussed in this tip. (As an aside, some of my macros got slower and slower over the years as we moved from one Windows version to the next, or one Excel version to the next. I had to retool some macros to make them more efficient. Eg - Using filter techniques instead of looping. But that is a whole other topic!)
2021-02-10 19:42:22
Peter
Thanks for the warning. I am an inveterate tinkerer.
I have the same question as mechie.
2021-02-09 13:19:48
J. Woolley
I believe the code fragmentation described in this Tip might have been a problem in older versions of Excel, but has anyone actually noticed this problem since Excel began using the Open XML (*.xlsm) workbook format?
2021-02-08 09:27:53
mechie
Can one export the module and then import it back into the workbook to clear VBA fragmentation?
My template workbooks have a LOT of other stuff going on (dozens of worksheets, hundreds of range names, lots of data, etc.) It is not just an empty workbook with macros. Perhaps if I were to export the VBA modules, strip all VBA (eg, save as an xlsx file), then turn it into an xltm file (new, fresh workbook) and import the VBA modules back in? Would that work?
Got a version of Excel that uses the ribbon interface (Excel 2007 or later)? This site is for you! If you use an earlier version of Excel, visit our ExcelTips site focusing on the menu interface.
FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."
Copyright © 2026 Sharon Parq Associates, Inc.
Please Note:
This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, 2016, 2019, and 2021. 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:
Comments