How to Add and Edit PDF Annotations

// Import the necessary namespaces for working with the IronPdf library
using IronPdf;
using IronPdf.Annotations;

// Create an instance of ChromePdfRenderer to create PDFs from HTML content
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Render an HTML string as a PDF document
// This example renders a simple h1 HTML element as a PDF
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Annotation</h1>");

// Create a text annotation object to add a 'sticky note' like comment on the specified page index
TextAnnotation annotation = new TextAnnotation(0) // Page index 0, representing the first page
{
    // Set the title that will appear on the annotation note
    Title = "This is the title",
    // Define the main content or body of the annotation note
    Contents = "This is the long 'sticky note' comment content...",
    // Specify the location (X, Y coordinates) of the annotation on the page
    X = 50, // X-coordinate position from the left (in points)
    Y = 700 // Y-coordinate position from the bottom (in points)
};

// Add the created annotation to the annotations collection of the PDF document
pdf.Annotations.Add(annotation);

// Save the PDF with the annotated text to a specific file
// The saved file will be named 'annotation.pdf' in the working directory
pdf.SaveAs("annotation.pdf");

' Import the necessary namespaces for working with the IronPdf library

Imports IronPdf

Imports IronPdf.Annotations



' Create an instance of ChromePdfRenderer to create PDFs from HTML content

Private renderer As New ChromePdfRenderer()



' Render an HTML string as a PDF document

' This example renders a simple h1 HTML element as a PDF

Private pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Annotation</h1>")



' Create a text annotation object to add a 'sticky note' like comment on the specified page index

Private annotation As New TextAnnotation(0) With {

	.Title = "This is the title",

	.Contents = "This is the long 'sticky note' comment content...",

	.X = 50,

	.Y = 700

}



' Add the created annotation to the annotations collection of the PDF document

pdf.Annotations.Add(annotation)



' Save the PDF with the annotated text to a specific file

' The saved file will be named 'annotation.pdf' in the working directory

pdf.SaveAs("annotation.pdf")

using IronPdf;
using IronPdf.Annotations;
using System;
using System.Linq;

// Load an existing PDF document that contains annotations
PdfDocument pdf = PdfDocument.FromFile("annotation.pdf");

// Retrieve the collection of annotations from the PDF document
PdfAnnotationCollection annotationCollection = pdf.Annotations;

// Ensure that there is at least one annotation in the collection
if (annotationCollection.Any())
{
    // Select the first annotation in the collection and cast it to a TextAnnotation
    TextAnnotation annotation = annotationCollection.First() as TextAnnotation;

    // Check if the annotation is successfully cast to a TextAnnotation
    if (annotation != null)
    {
        // Edit the annotation's properties
        annotation.Title = "New title"; // Set a new title for the annotation
        annotation.Contents = "New content..."; // Set new contents for the annotation
        annotation.X = 150; // Set the X-coordinate for the position of the annotation
        annotation.Y = 800; // Set the Y-coordinate for the position of the annotation

        // Save the modified PDF document with a new name
        pdf.SaveAs("editedAnnotation.pdf");

        // Output a confirmation message about the successful modification
        Console.WriteLine("The PDF annotation has been successfully edited and saved as 'editedAnnotation.pdf'.");
    }
    else
    {
        // Output a message if the annotation is not of the type TextAnnotation
        Console.WriteLine("The first annotation is not a text annotation.");
    }
}
else
{
    // Output a message if there are no annotations to edit
    Console.WriteLine("No annotations found in the PDF document.");
}

Imports IronPdf

Imports IronPdf.Annotations

Imports System

Imports System.Linq



' Load an existing PDF document that contains annotations

Private pdf As PdfDocument = PdfDocument.FromFile("annotation.pdf")



' Retrieve the collection of annotations from the PDF document

Private annotationCollection As PdfAnnotationCollection = pdf.Annotations



' Ensure that there is at least one annotation in the collection

If annotationCollection.Any() Then

	' Select the first annotation in the collection and cast it to a TextAnnotation

	Dim annotation As TextAnnotation = TryCast(annotationCollection.First(), TextAnnotation)



	' Check if the annotation is successfully cast to a TextAnnotation

	If annotation IsNot Nothing Then

		' Edit the annotation's properties

		annotation.Title = "New title" ' Set a new title for the annotation

		annotation.Contents = "New content..." ' Set new contents for the annotation

		annotation.X = 150 ' Set the X-coordinate for the position of the annotation

		annotation.Y = 800 ' Set the Y-coordinate for the position of the annotation



		' Save the modified PDF document with a new name

		pdf.SaveAs("editedAnnotation.pdf")



		' Output a confirmation message about the successful modification

		Console.WriteLine("The PDF annotation has been successfully edited and saved as 'editedAnnotation.pdf'.")

	Else

		' Output a message if the annotation is not of the type TextAnnotation

		Console.WriteLine("The first annotation is not a text annotation.")

	End If

Else

	' Output a message if there are no annotations to edit

	Console.WriteLine("No annotations found in the PDF document.")

End If

using IronPdf;

// Load the PDF document from the specified file path
PdfDocument pdf = PdfDocument.FromFile("multipleAnnotation.pdf");

// Check if there are enough annotations to remove the one at index 1
if (pdf.Annotations.Count > 1)
{
    // Remove a single annotation from the loaded PDF document using the specified index
    // Here, we assume that the annotations list is zero-indexed, hence the second annotation is removed
    pdf.Annotations.RemoveAt(1);
}
else
{
    // Log or handle the scenario where there are not enough annotations to remove
    Console.WriteLine("The PDF does not contain enough annotations to remove one at index 1.");
}

// Save the modified PDF to a new file with the specified path
pdf.SaveAs("removeSingleAnnotation.pdf");

Imports IronPdf



' Load the PDF document from the specified file path

Private pdf As PdfDocument = PdfDocument.FromFile("multipleAnnotation.pdf")



' Check if there are enough annotations to remove the one at index 1

If pdf.Annotations.Count > 1 Then

	' Remove a single annotation from the loaded PDF document using the specified index

	' Here, we assume that the annotations list is zero-indexed, hence the second annotation is removed

	pdf.Annotations.RemoveAt(1)

Else

	' Log or handle the scenario where there are not enough annotations to remove

	Console.WriteLine("The PDF does not contain enough annotations to remove one at index 1.")

End If



' Save the modified PDF to a new file with the specified path

pdf.SaveAs("removeSingleAnnotation.pdf")

using IronPdf;

// Load a PDF document from a file
// This creates a PdfDocument object from the specified PDF file.
PdfDocument pdf = PdfDocument.FromFile("multipleAnnotation.pdf");

// Remove all annotations on the first page (index 0) of the PDF document.
// Page indexes are zero-based, which means the first page is at index 0.
// This line removes any annotations present on the first page only.
pdf.Annotations.RemoveAllAnnotationsForPage(0);

// Remove all annotations from the entire document.
// This operation removes every annotation from every page of the PDF.
// After executing this, the document will have no annotations left.
pdf.Annotations.Clear();

// Save the modified PDF document to a new file.
// This overwrites any existing file with the same name ("removeAllAnnotation.pdf").
pdf.SaveAs("removeAllAnnotation.pdf");

Imports IronPdf



' Load a PDF document from a file

' This creates a PdfDocument object from the specified PDF file.

Private pdf As PdfDocument = PdfDocument.FromFile("multipleAnnotation.pdf")



' Remove all annotations on the first page (index 0) of the PDF document.

' Page indexes are zero-based, which means the first page is at index 0.

' This line removes any annotations present on the first page only.

pdf.Annotations.RemoveAllAnnotationsForPage(0)



' Remove all annotations from the entire document.

' This operation removes every annotation from every page of the PDF.

' After executing this, the document will have no annotations left.

pdf.Annotations.Clear()



' Save the modified PDF document to a new file.

' This overwrites any existing file with the same name ("removeAllAnnotation.pdf").

pdf.SaveAs("removeAllAnnotation.pdf")