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You can specify the default font name for a document. GroupDocs.Viewer uses this font during rendering instead of any not installed fonts. For example, if the document includes a font containing non-English characters, specify the default font name to ensure that GroupDocs.Viewer replaces any missing font with one which has the same character set.

The following code snippet shows how to set the default font name:

using GroupDocs.Viewer;
using GroupDocs.Viewer.Options;
// ...

using (Viewer viewer = new Viewer("sample.pptx"))
{
    // Create options for rendering HTML document with embedded resources
    HtmlViewOptions viewOptions = HtmlViewOptions.ForEmbeddedResources();
   
    // Specify a default font name is the options
    viewOptions.DefaultFontName = "Courier New";
    
    // Render input PPTX to output HTML
    viewer.View(viewOptions);
}

VB.NET

Imports GroupDocs.Viewer
Imports GroupDocs.Viewer.Options
' ...

Module Program
    Sub Main(args As String())
        Using viewer As Viewer = New Viewer("sample.pptx")
            ' Create options for rendering HTML document with embedded resources
            Dim viewOptions As HtmlViewOptions = HtmlViewOptions.ForEmbeddedResources   ()
        
            ' Specify a default font name is the options
            viewOptions.DefaultFontName = "Courier New"
            
            ' Render input PPTX to output HTML
            viewer.View(viewOptions)
        End Using
    End Sub
End Module

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