Embedded Font - PowerPoint C# API

Embedded fonts in PowerPoint are useful when you want your presentation to appear correctly when opened on any system or device. If you used a third-party or non-standard font because you got creative with your work, then you have even more reasons to embed your font. Otherwise (without embedded fonts), the texts or numbers on your slides, the layout, styling, etc. may change or turn into confusing rectangles.

The FontsManager class, FontData class, Compress class, and their interfaces contain most of the properties and methods you need to work with embedded fonts in PowerPoint presentations.

Get or Remove Embedded Fonts from Presentation

Aspose.Slides provides the GetEmbeddedFonts method (exposed by the FontsManager class) to allow you to get (or find out) the fonts embedded in a presentation. To remove fonts, the RemoveEmbeddedFont method (exposed by the same class) is used.

This C# code shows you how to get and remove embedded fonts from a presentation:

using (Presentation presentation = new Presentation("EmbeddedFonts.pptx"))
{
    ISlide slide = presentation.Slides[0];

    // Renders a slide containing a text frame that uses embedded "FunSized"
    using (IImage image = slide.GetImage(new Size(960, 720)))
    {
        image.Save("picture1_out.png", ImageFormat.Png);
    }

    IFontsManager fontsManager = presentation.FontsManager;

    IFontData[] embeddedFonts = fontsManager.GetEmbeddedFonts();

    // Finds the "Calibri" font
    IFontData funSizedEmbeddedFont = Array.Find(embeddedFonts, delegate (IFontData data)
    {
        return data.FontName == "Calibri";
    });

    // Removes the "Calibri" font
    fontsManager.RemoveEmbeddedFont(funSizedEmbeddedFont);

    // Renders the presentation; the "Calibri" font is replaced with an existing one
    using (IImage image = slide.GetImage(new Size(960, 720)))
    {
        image.Save("picture2_out.png", ImageFormat.Png);
    }

    // Saves the presentation without embedded "Calibri" font to disk
    presentation.Save("WithoutManageEmbeddedFonts_out.ppt", SaveFormat.Ppt);
}

Add Embedded Fonts to Presentation

Using the EmbedFontCharacters enum and two overloads of the AddEmbeddedFont method, you can select your preferred (embedding) rule to embed the fonts in a presentation. This C# code shows you how to embed and add fonts to a presentation:

// Loads the presentation
Presentation presentation = new Presentation("Fonts.pptx");

// Loads the source font to be replaced
IFontData sourceFont = new FontData("Arial");


IFontData[] allFonts = presentation.FontsManager.GetFonts();
IFontData[] embeddedFonts = presentation.FontsManager.GetEmbeddedFonts();
foreach (IFontData font in allFonts)
{
    if (!embeddedFonts.Contains(font))
    {
        presentation.FontsManager.AddEmbeddedFont(font, EmbedFontCharacters.All);
    }
}

// Saves the presentation to disk
presentation.Save("AddEmbeddedFont_out.pptx", SaveFormat.Pptx);

Compress Embedded Fonts

To allow you to compress the fonts embedded in a presentation and reduce its file size, Aspose.Slides provides the CompressEmbeddedFonts method (exposed by the Compress class).

This C# code shows you how to compress embedded PowerPoint fonts:

using (Presentation pres = new Presentation("pres.pptx"))
{
    Aspose.Slides.LowCode.Compress.CompressEmbeddedFonts(pres);
    pres.Save("pres-out.pptx", SaveFormat.Pptx);
}