The Problem.

There are many annoyances when designing a VBA project to run on both Windows and Mac computers. One of the most noticeable is related to the difference in screen resolution between the two platforms. On the Mac, it’s 96 dpi, where each dot represents a pixel. In Windows, screen resolution is 72 dpi (dots per inch) and each dot represents a “point”, while pixels are still 96 per inch. Confusing the issue is that VBA in Windows uses points as the measurement unit for designing UserForms, while VBA on the Mac uses pixels. The result is that without applying any correction, UserForms that come out just right in Windows are only 75% as large on the Mac, making them difficult to read.

For example, here is a UserForm designed in Windows, opened in Windows. The text might seem a bit small to me now that my eyes are getting older, but it’s still perfectly legible.

Here is that same UserForm opened on a Mac. The header text is fine, but the text in the dialog itself is too small to read comfortably.

In the past, I supported separate add-ins, one for Windows and the other for Mac. The dialogs for each were appropriately sized, and I took care of other coding idiosyncrasies in the separate files. But it’s a lot of extra work to lug around two separate versions of every file. Every adjustment you make has to be made twice, and it’s hard to remember what changes you’ve made across large projects.

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The Solution: UserForms For Mac And Windows.

I have developed a simple routine that is called from each UserForm’s initialize event, which changes the size, position, and font of each control by a factor of 4/3. The text still may not always be perfect, since you can only specify whole number font sizes, so I suppose I should always round up the font size. I do make sure when I design the form that controls are more than large enough in case the text takes up extra space. Aside from this, it works pretty nicely.

I have an Excel VBA project that makes heavy use of Windows Scripting Dictionary objects. I recently had a user attempt to use it on a Mac and received the following error: Compile Error: Can't find. Use VBA add-ins and macros that you developed for Office for Windows with Office for Mac. Applies to: Excel for Mac PowerPoint for Mac Word for Mac Office 2016 for Mac. If you are authoring Macros for Office for Mac, you can use most of the same objects that are available in VBA for Office.

Here is a UserForm designed in Windows, but which uses the resizing routine so it displays legibly on either computer. First, it is shown opened in Windows.

Below it’s shown opened on the Mac. The dialogs are equally legible, and the text came out pretty much the same. Sometimes a large block of text may not wrap the same, so if it really matters, you should hard code your line breaks by typing Ctrl+Return while entering the text.

Note: While Microsoft has substantially improved the VB editor on the Mac, you still can’t work with UserForms on the Mac. You have to build them into your file in Windows and them move the file to the Mac.

The Code.

This calls the routine from the UserForm’s code module:

The #If Mac Then and #End If structure indicates a section of code which is conditionally compiled. When using a Mac, the constant Mac is True, so the code between #If and #End If is compiled and run, so the UserForm is resized. In Windows, this code is ignored, and the UserForm is displayed without rescaling.

The global resizing factor is placed in an appropriate place in the declarations section of a regular code module:

And this routine in a regular code module does the resizing:

Example Workbook.

I’ve posted a simple workbook that illustrates this technique. Download it by clicking the icon below.

When you open the workbook, you’ll see a blank worksheet with three buttons.

The first button opens the Windows-only UserForm shown in the first and second figures above, in the description of the problem.

The second button opens the Windows-and-Mac UserForm shown in the third and fourth figures, in the description of the solution.

The third button opens another Windows-and-Mac UserForm which also has a simple mechanism to call the ResizeUserForm procedure, and resize the UserForm on the fly. Here is it opened in Windows.

Enter a number in the New Form Magnification box (for example 2) and click Apply, and the form is resized accordingly.

Enter 1.333333, the ratio between pixels and points, and this is how it will be resized for the Mac, though it’s too large for Windows.

Enter 0.75, the inverse of the above, and you get a sense for how small it would be on the Mac without rescaling. Yeah, way too small.

Here is the same form opened on a Mac. Note that it’s already resized to 1.333333. Resized nicely.

Let’s see how it looks at 200%. Pretty large.

If you enter 1 in the box, you can see how the form would look without resizing.

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In all of your real projects, you should apply this technique to all of your UserForms. Before deploying them to your users, you should make sure that the UserForms that look fine in Windows rescale properly on a Mac. Occasionally text wraps differently or certain other controls may need adjustments. But this eliminates the need for separate UserForms for Mac and Windows.