Document Processing SDKs

Annotate XLSX Spreadsheets with C#

Add and manage annotations in Excel XLSX files programmatically — no Microsoft Office required.

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How to Annotate an XLSX in C#

GroupDocs.Annotation for .NET makes it easy to annotate XLSX spreadsheets:

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

Sample annotations Copy

// Annotate an XLSX spreadsheet

// Open the XLSX with an Annotator instance
using (Annotator annotator = new Annotator("input.xlsx"))
{
    // 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 XLSX
    annotator.Save("annotated.xlsx");
}

dotnet add package GroupDocs.Annotation

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Full Control Over XLSX Annotations

Add every annotation type to Excel spreadsheets and manage them with a simple API.

Text Markup

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

Shapes & Watermarks

Draw shapes and stamp watermarks or images onto XLSX worksheets.

Manage Annotations

Get, remove, import, and export XLSX annotations.

Read XLSX Annotations

Retrieve the annotations stored in an annotated XLSX spreadsheet:

C#

Download result Copy

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

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

    // Save the spreadsheet
    annotator.Save("output.xlsx");
}

dotnet add package GroupDocs.Annotation

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Annotate XLSX Files

GroupDocs.Annotation for .NET lets you add, edit, and remove annotations in Excel XLSX spreadsheets. Highlight cells, draw shapes, stamp watermarks and images, and attach threaded comments — then save the result back to XLSX.

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