How to substitute missing font when converting presentations

Background

In case your presentation document contains a font that is not installed into the system GroupDocs.Viewer will use a default font. GroupDocs.Viewer enables you to specify font substitution with DefaultFontName setting.

Font substitution

To set font substitution for missing fonts please use the following code:

When converting to HTML with embedded resources:

using (Viewer viewer = new Viewer("input.pptx"))
{
    HtmlViewOptions viewOptions = HtmlViewOptions.ForEmbeddedResources("output/html_embedded/p_{0}.html");
    viewOptions.DefaultFontName = "Times New Roman";
    viewer.View(viewOptions);
}

When converting to HTML with external resources:

using (Viewer viewer = new Viewer("input.pptx"))
{
    HtmlViewOptions viewOptions = HtmlViewOptions.ForExternalResources("output/html_external");
    viewOptions.DefaultFontName = "Times New Roman";
    viewer.View(viewOptions);
}

Output HTML with default font:

Output HTML with “Times New Roman” font:

When converting to PDF:

using (Viewer viewer = new Viewer("input.pptx"))
{
      PdfViewOptions viewOptions = new PdfViewOptions("output.pdf");
      viewOptions.DefaultFontName = "Times New Roman";
      viewer.View(viewOptions);
}

Output PDF with default font:

Output PDF with “Times New Roman” font:

More resources

GitHub Examples

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Viewer for .NET examples, plugins, and showcase
• GroupDocs.Viewer for Java examples, plugins, and showcase
• Document Viewer for .NET MVC UI Example 
• Document Viewer for .NET App WebForms UI Modern Example
• Document Viewer for Java App Dropwizard UI Modern Example
• Document Viewer for Java Spring UI Example

Free Online App

Along with full-featured .NET library we provide simple but powerful free Apps. You are welcome to view Word, PDF, Excel, PowerPoint documents with free to use online GroupDocs Viewer App.