How to Add Point Annotations to PDFs Using GroupDocs.Annotation for .NET

Introduction

Enhance your PDF documents by adding interactive point annotations using GroupDocs.Annotation for .NET. Whether you’re a developer aiming to streamline document reviews or a business professional needing precise feedback mechanisms, this guide will help improve your workflow.

What You’ll Learn:

  • Set up and use GroupDocs.Annotation for .NET.
  • Add a point annotation to a PDF document step-by-step.
  • Troubleshoot common implementation issues.
  • Apply real-world applications for enhanced PDF interactions.

By the end of this guide, you will know how to integrate GroupDocs.Annotation into your projects seamlessly. Let’s start by ensuring you have the necessary prerequisites.

Prerequisites

Before diving into the code, ensure you have:

Required Libraries and Versions

  • GroupDocs.Annotation for .NET - Version 25.4.0 or later.

Environment Setup Requirements

  • Visual Studio installed on your machine.
  • A basic understanding of C# programming.

Setting Up GroupDocs.Annotation for .NET

To begin, install the GroupDocs.Annotation library in your project using one of these methods:

NuGet Package Manager Console:

Install-Package GroupDocs.Annotation -Version 25.4.0

.NET CLI:

dotnet add package GroupDocs.Annotation --version 25.4.0

License Acquisition Steps

GroupDocs offers a free trial, temporary licenses for extensive testing, and purchase options for production use:

Once you have your license, initialize the GroupDocs.Annotation environment in C#:

using System;
using GroupDocs.Annotation;

// Initialize the annotator with a PDF document path and license
using (Annotator annotator = new Annotator("input.pdf"))
{
    // License setup code goes here
}

Implementation Guide

Adding Point Annotation

Overview: Point annotations mark specific locations on a page, providing interactive feedback or notes.

Step 1: Set Up Your Environment

Ensure the GroupDocs.Annotation library is installed and configured as outlined above.

Step 2: Create a PointAnnotation Object

Create a point annotation with specific properties:

using GroupDocs.Annotation.Models;
using GroupDocs.Annotation.Models.AnnotationModels;

// Create a PointAnnotation object\PointAnnotation point = new PointAnnotation
{
    Box = new Rectangle(100, 100, 0, 0), // Coordinates for the annotation
    CreatedOn = DateTime.Now,
    Message = "This is a point annotation\