Replace missing fonts

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:

Render PowerPoint Presentations Set resolution for images when rendering to HTML