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How to Add Watermark Annotation to PDF using C#. For more information, please follow link:
using System;
using System.Collections.Generic;
using GroupDocs.Annotation;
using GroupDocs.Annotation.Models;
using GroupDocs.Annotation.Models.AnnotationModels;
namespace AddWatermarkAnnotationtoPDFUsingCSharp
internal class Program
static void Main(string[] args)
//Set License to avoid the limitations of Annotation library
License lic = new License();
//Instantiate Annotator object with input PDF path
using (Annotator annotator = new Annotator("input.pdf"))
//Instantiate WatermarkAnnotation object and set it's properties
WatermarkAnnotation watermark = new WatermarkAnnotation
Angle = 75,
Box = new Rectangle(200, 200, 100, 50),
CreatedOn = DateTime.Now,
Text = "Watermark",
FontColor = 65535,
FontSize = 12,
Message = "This is watermark annotation",
Opacity = 0.7,
AutoScale = true,
HorizontalAlignment = HorizontalAlignment.Center,
VerticalAlignment = VerticalAlignment.Center,
Replies = new List<Reply>
new Reply
Comment = "First comment",
RepliedOn = DateTime.Now
new Reply
Comment = "Second comment",
RepliedOn = DateTime.Now
//Add Watermark Annotation to PDF
//Save the final output PDF
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