Detailed introduction on how to add image stamps to PDF files using C#

Adding a seal to a document can play a certain role, for example, to prevent the file from being used casually, or to ensure the security and authority of the document content. C#Add pictures There are actually many ways to implement seals. Here I use the free third-party software Free Spire.PDF to explain how to programming How to add a picture seal to a PDF file

Adding a seal to a document can play a certain role, for example, to prevent the file from being used at will, or to ensure the security and authority of the document content. There are actually many ways to add image stamps in C#. Here I use the free third-party software Free Spire.PDF to explain how to add image stamps to PDF files programmatically.

The specific steps are as follows:

Before this, we need to add the dll file as a reference. Add reference → Browse → Spire.XLS folder → Bin → .NET 2.0/3.5/4.0/4.5/4.0 ClientProfile → Spire. Add a stamp to the document.

PdfDocument doc = new PdfDocument();
doc.LoadFromFile(@"E:\Visual Studio\Sample\template7\sample.pdf");

Step 2: Get the first page of the document.

PdfPageBase page = doc.Pages[0];

Step 3: Create a new PdfRubberStampAnnotation object and specify the range and size of its

annotation

.

PdfRubberStampAnnotation loStamp = new PdfRubberStampAnnotation(new RectangleF(new PointF(-5,-5), new SizeF(60, 60)));

Step 4: Instantiate a PdfAppearance object.

PdfAppearance loApprearance = new PdfAppearance(loStamp);

Step 5: Load the image used as the seal.

PdfImage image = PdfImage.FromFile(@"C:\Users\Administrator\Pictures\sample.jpg");

Step 6: Create a new PDF template and draw pictures in the template.

PdfTemplate template = new PdfTemplate(160, 160);
template.Graphics.DrawImage(image, 0, 0);
loApprearance.Normal = template;
loStamp.Appearance = loApprearance;

Step 7: Add a seal to the PDF document.

page.AnnotationsWidget.Add(loStamp);

Step 8: Save the document.

string output = "ImageStamp.pdf";
doc.SaveToFile(output);

PDF document before running:

PDF document after running:

All Code:

using System;
using System.Drawing;
using System.Windows.Forms;
using Spire.Pdf;
using Spire.Pdf.Annotations;
using Spire.Pdf.Annotations.Appearance;
using Spire.Pdf.Graphics;

namespace addanimagestamptoaPDF_file
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
      PdfDocument doc = new PdfDocument();
      doc.LoadFromFile(@"E:\Visual Studio\Sample\template7\sample.pdf");
 
      PdfPageBase page = doc.Pages[0];
      
      PdfRubberStampAnnotation loStamp = new PdfRubberStampAnnotation(new RectangleF(new PointF(-5, -5), new SizeF(60, 60)));
      PdfAppearance loApprearance = new PdfAppearance(loStamp);
      PdfImage image = PdfImage.FromFile(@"C:\Users\Administrator\Pictures\sample.jpg");
 
      PdfTemplate template = new PdfTemplate(160, 160);
      template.Graphics.DrawImage(image, 0,0);
      loApprearance.Normal = template;
      loStamp.Appearance = loApprearance;
        
      page.AnnotationsWidget.Add(loStamp);

      string output = "ImageStamp.pdf";
      doc.SaveToFile(output);
  
    }
  }
}

Through this component, in addition to quickly adding image stamps to PDF files, we can also add image and text watermarks to PDF files and add image backgrounds. You can refer to it. It may be useful to you. help. Thanks for browsing.

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