Annotation for Java Annotation for Python

Annotation for Net

Annotate Documents with GroupDocs.Annotation

Add, edit, and remove comments, text markup, shapes, watermarks, and image stamps in PDFs, Word documents, spreadsheets, presentations, and images using our powerful .NET solution.

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Version 26.6.0 Released

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// Open the file with an Annotator instance
using (Annotator annotator = new Annotator("input.pdf"))
{
    // Create and configure an annotation
    AreaAnnotation area = new AreaAnnotation
    {
        Box = new Rectangle(100, 100, 200, 80),
        BackgroundColor = 65535,
        PageNumber = 0,
        Message = "Review this section"
    };

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

    // Save the annotated file
    annotator.Save("annotated.pdf");
}

dotnet add package GroupDocs.Annotation

GroupDocs.Annotation at a Glance

Add professional-grade document annotation to your .NET applications

Add Text Markup

GroupDocs.Annotation for .NET lets you highlight, underline, strike out, squiggly-underline, redact, or replace text. Supported across a wide variety of formats including PDFs and Office documents, this feature streamlines document review and collaboration.

Draw Graphic Annotations

Add area, ellipse, point, arrow, distance, and polyline shapes with configurable pen and fill colors to call out regions and measurements on a page.

Comments and Replies

Attach an author and a threaded discussion of replies to any annotation to support structured review and approval workflows.

Manage and Exchange Annotations

List, update, and remove annotations, filter by type, render document previews, and import or export annotations as XML.

Platform Independence

GroupDocs.Annotation for .NET is compatible with a wide range of operating systems, development frameworks, and package managers.

Supported File Formats

GroupDocs.Annotation for .NET supports operations with the following file formats.

MS Office Formats

Word: DOCX, DOC, DOCM, DOT, DOTX, DOTM, RTF
Excel: XLSX, XLS, XLSM, XLSB, ODS
PowerPoint: PPT, PPTX, PPS, PPSX

Other Office Formats

Portable: PDF
OpenDocument: ODT, ODP
Diagram: VSD, VSDX

Other Formats

Images: BMP, JPEG, PNG, TIFF
CAD: DWG, DXF
Email: EML, EMLX

GroupDocs.Annotation for .NET Features

Add and manage annotations in PDFs, Office files, and images with high speed and accuracy.

Text Markup

Highlight, underline, strike out, or squiggly-underline selected text in any supported document.

Graphic Shapes

Draw area, ellipse, arrow, point, distance, and polyline annotations with custom colors.

Watermarks & Stamps

Add text watermarks, image stamps, and editable text fields onto a document page.

Get and Remove

Read every annotation in a document, then remove by id, type, or instance.

Comments & Replies

Attach threaded replies with user and timestamp metadata to any annotation.

Import and Export

Save a document’s annotations to XML and load them back into another document.

Code Samples

Typical usage examples of GroupDocs.Annotation for .NET in action

Highlight Text

GroupDocs.Annotation for .NET enables C# developers to highlight text and add markup to documents:

Highlight Text in a Document

// Open the document with an Annotator instance
using (Annotator annotator = new Annotator("input.pdf"))
{
    // Create a text highlight annotation defined by quad points
    HighlightAnnotation highlight = new HighlightAnnotation
    {
        PageNumber = 0,
        FontColor = 65535,
        Points = new List<Point>
        {
            new Point(80, 730), new Point(240, 730),
            new Point(240, 750), new Point(80, 750)
        }
    };

    // Add the highlight to the document
    annotator.Add(highlight);

    // Save the annotated document
    annotator.Save("annotated.pdf");
}

Manage Annotations

Use our API to read and remove annotations from a document:

Get and Remove Annotations

// Open an annotated document with an Annotator instance
using (Annotator annotator = new Annotator("annotated.pdf"))
{
    // Retrieve all annotations from the document
    List<AnnotationBase> annotations = annotator.Get();

    // Remove the first annotation
    annotator.Remove(annotations[0]);

    // Save the updated document
    annotator.Save("output.pdf");
}

Stamp a Watermark

GroupDocs.Annotation for .NET lets C#

developers stamp a text watermark across document pages:

Stamp a Watermark on a Document

// Open the document with an Annotator instance style=color:#00f>using (Annotator annotator = new Annotator("input.pdf")) { // Create a diagonal text watermark and place it on the first page WatermarkAnnotation watermark = new WatermarkAnnotation { Box = new Rectangle(100, 100, 200, 100), Text = "CONFIDENTIAL", FontColor = 16711680, FontSize = 24, Angle = 45, Opacity = 0.5, PageNumber = 0 }; // Add the watermark and save the result annotator.Add(watermark); annotator.Save("annotated.pdf"); }

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