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FontSize of RadRichTextBox not Respected

Updated on Sep 15, 2025

Environment

Product Version2019.2.618
ProductRadRichTextBox for WPF

Description

The FontSize property of the RadRichTextBox is not applied to its text.

Solution

To display the proper FontSize passed to the RadRichTextBox control, you need to also set its DocumentInheritsDefaultStyleSettings property to True.

XAML
	<Grid>
		<telerik:RadRichTextBox x:Name="radRichTextBox" 
								DocumentInheritsDefaultStyleSettings="True" 
								FontSize="8" />
		<telerik:HtmlDataProvider 
								RichTextBox="{Binding ElementName=radRichTextBox}"  
								Html="{Binding Path=Html, Mode=TwoWay}" />
	</Grid>

See Also