When copying slides from one presentation to another, the font style and/or the font size may change. In most cases, this is the expected behavior of PowerPoint. However, unexpected changes may occur when copying between PowerPoint's outdated ppt file format (default until Office 2003) and the modern pptx file format of PowerPoint 2007 and later versions.
Check the PowerPoint font menu to see if a given text box uses a theme font. Theme fonts are listed in the separate Theme Fonts section of the menu, and (Headings) or (Body) is appended to the font name.
The font type used in think-cell labels is taken from the body text placeholder on the slide master of the PowerPoint presentation or template.
Use PowerPoint's paste options to control whether theme fonts are replaced.
Office 2010 and later: Choose the paste option from Home
→ Paste Options (the little arrow below the Paste button).
Alternatively, use the Smart Tag that appears next to the pasted slide.
Insert a text box with sample text into the original presentation. Copy it and paste it into the destination presentation. From the smart tag that appears after pasting, you can choose the following options:
Office 2007: Even though you chose Keep Source Formatting, the font type may change to the destination's theme font and the size may change. This is a bug in Office 2007 and will not be fixed by Microsoft.
Office 2010 and later: This works as expected. If the font changes when using Office 2010, this is most likely due to a bug that has since been fixed by Microsoft. Install Microsoft's automatic updates for Office 2010 or at least KB2598346.
Office 2007 and later: The pasted text box has a font size that is retrieved from the default PowerPoint text style of the destination presentation. This default text style's formatting options are not the same as for
Office 2007: Update to Office 2010 or later. Microsoft does not publish fixes for Office 2007 any more (except for security updates). Many issues remain which are fixed only in more recent versions.
Office 2007 and later: The font size is determined by the default PowerPoint text style, which, to our knowledge and according to the information we received from Microsoft, cannot be accessed in the PowerPoint user interface. However, you can use VBA macros to display and change the font size of all indent levels of the default text style in the destination file.
Open the VBA editor with Alt+F11. Select your workbook and click on Insert → New module. Then paste one of the following macros and run it by clicking Run Macro or by pressing F5.
Sub DisplayDefaultTextSize() Dim lvl As TextStyleLevel For Each lvl In ActivePresentation.SlideMaster.TextStyles(ppDefaultStyle).Levels Debug.Print lvl.Font.Size Next End Sub
Sub AdjustDefaultTextSize() Dim lvl As TextStyleLevel For Each lvl In ActivePresentation.SlideMaster.TextStyles(ppDefaultStyle).Levels lvl.Font.Size = 14 Next End Sub