Document Processing SDKs

Annotate PPTX Presentations with C#

Add and manage annotations in PowerPoint PPTX files programmatically — no Microsoft Office required.

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How to Annotate a PPTX in C#

GroupDocs.Annotation for .NET makes it easy to annotate PPTX presentations:

Open the PPTX with an Annotator instance.
Create and configure the annotation you need.
Add the annotation to the presentation.
Save the annotated PPTX.

Sample annotations Copy

// Annotate a PPTX presentation

// Open the PPTX with an Annotator instance
using (Annotator annotator = new Annotator("input.pptx"))
{
    // Create an area annotation
    AreaAnnotation area = new AreaAnnotation
    {
        Box = new Rectangle(100, 100, 200, 80),
        BackgroundColor = 65535,
        PageNumber = 0,
        Message = "Important"
    };

    // Add the annotation
    annotator.Add(area);

    // Save the annotated PPTX
    annotator.Save("annotated.pptx");
}

dotnet add package GroupDocs.Annotation

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Full Control Over PPTX Annotations

Add every annotation type to PowerPoint presentations and manage them with a simple API.

Text Markup

Highlight, underline, strike out, or replace text in PPTX files.

Shapes & Watermarks

Draw shapes and stamp watermarks or images onto PPTX slides.

Manage Annotations

Get, remove, import, and export PPTX annotations.

Read PPTX Annotations

Retrieve the annotations stored in an annotated PPTX presentation:

C#

Download result Copy

//  Open the annotated PPTX
using (Annotator annotator = new Annotator("annotated.pptx"))
{
    // Get all annotations
    List<AnnotationBase> annotations = annotator.Get();

    // Inspect each annotation
    foreach (AnnotationBase annotation in annotations)
    {
        System.Console.WriteLine(annotation.Message);
    }

    // Save the presentation
    annotator.Save("output.pptx");
}

dotnet add package GroupDocs.Annotation

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Annotate PPTX Files

GroupDocs.Annotation for .NET lets you add, edit, and remove annotations in PowerPoint PPTX presentations. Highlight text, draw shapes, stamp watermarks and images, and attach threaded comments — then save the result back to PPTX.

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