How to add a picture stamp in a PDF file using C # detailed introduction

Adding stamps to a document can play a role, such as preventing files from being used at will, or ensuring the security and authority of the contents of the document. C # Add a picture stamp there are actually many ways to do it, and here I'm using free third-party software, Spire.pdf, to show you how to programmatically add a picture stamp to a PDF file

Adding stamps to a document can play a role, such as preventing files from being used at will, or ensuring the security and authority of the contents of the document. C # Add a picture stamp there are actually many ways to do it, and here I'm using free third-party software, Spire.pdf, to show you how to programmatically add a picture stamp to a PDF file.

The steps are as follows:

Until then, 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.xls.dll.

First step: Create a new PDF Document object and load the document you want to add the stamp to.

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 scope 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 picture used as a 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:

The pdf document after running:

All codes:

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 a picture seal to a PDF file, we can also add a picture and text watermark and add a picture background to the PDF file. You can refer to it, maybe it will help you. Thanks for browsing.