1. GroupDocs Documentation
    2. /
    3. GroupDocs.Annotation Product Family
    4. /
    5. GroupDocs.Annotation for .NET
    6. /
    7. Annotation basics
    8. /
    9. Add annotation to the document
    10. /
    11. Add link annotation

    Add link annotation

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    Link annotation adds a hyperlink to document as shown in the picture below:

    You can set the following properties of the  LinkAnnotation class:

    • Url defines link to a web resource
    • Points defines the annotation positions as an array of points.

    To add a link annotation, follow these steps:

    1. Instantiate the Annotator class. Specify the input document path or stream.
    2. Instantiate the LinkAnnotation class. Specify the appropriate properties (position, page number, etc).
    3. Call the Add method. Specify the LinkAnnotation class.
    4. Call the Save method. Specify the output document path or stream.

    The following code snippet shows how to add LinkAnnotation to the document:

    //Add link annotation to the document from local disk
using (Annotator annotator = new Annotator("input.pdf"))
{
	LinkAnnotation link= new LinkAnnotation
    {
    	Url = "https://www.groupdocs.com/",
        CreatedOn = DateTime.Now,
        Message = "This is link annotation",
        BackgroundColor = 65535,
        PageNumber = 0,
        Points = new List<Point>
        {
        	new Point(80, 730), new Point(240, 730), new Point(80, 650), new Point(240, 650)
        },
        Replies = new List<Reply>
        {
        	new Reply
            {
            	Comment = "First comment",
                RepliedOn = DateTime.Now
            },
            new Reply
            {
            	Comment = "Second comment",
                RepliedOn = DateTime.Now
            }
        }
    };
    annotator.Add(link);
    annotator.Save("result.pdf");
}

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