Insert an Image Into a PDF in C#

Introduction

We will create a simple PDF grid and show how to insert an image into a specific PDF grid cell in C#. Images are more attractive for reading documents. Images are related to the contents. Sometimes, an image can describe some content more clearly, like using a chart to show how data changes in a period.

Spire.PDF for .NET is a professional .NET PDF component to quickly generate, open, modify and save PDF documents without using Office Automation and enables users to insert an image into a PDF and set its size depending on the page using C#. How to draw a nested grid in a PDF document and set a grid row & cell format. In the second part you understand how to Encrypt a PDF document with a password. This guide introduces an easy way to insert an image via Spire.PDF for .NET.

Create a Console Application for the demo. Use the following procedure:

1. Open Visual Studio.
2. "File" -> "New" -> "Project...".
3. Select C# Language then select Console Application and name it “InsertImageToPDF”.
4. Click OK.
5. Insert the following code for inserting an image into the PDF.

   private static void InsertImageIntoPDF()  
   {  
       try  
       {  
           //Path to Store PDF file  
          string outputFile = "result.pdf";  
           //Create a PDF document using Spire.PDF.dll  
           PdfDocument doc = new PdfDocument();  
           //Add a page  
           PdfPageBase page = doc.Pages.Add();  
     
           //Create a pdf grid  
           PdfGrid grid = new PdfGrid();  
     
           //Set the cell padding of pdf grid  
           grid.Style.CellPadding = new PdfPaddings(1, 1, 1, 1);  
     
           //Add a row for pdf grid  
           PdfGridRow row = grid.Rows.Add();  
     
           //Add two columns for pdf grid   
           grid.Columns.Add(4);  
           float width = page.Canvas.ClientSize.Width - (grid.Columns.Count + 1);  
     
           //Set the width of the first column  
           grid.Columns[0].Width = width * 0.20f;  
           grid.Columns[1].Width = width * 0.20f;  
           grid.Columns[2].Width = width * 0.20f;  
           grid.Columns[3].Width = width * 0.20f;  
             
           //Add a image  
           PdfGridCellTextAndStyleList lst = new PdfGridCellTextAndStyleList();  
           PdfGridCellTextAndStyle textAndStyle = new PdfGridCellTextAndStyle();  
           textAndStyle.Image = PdfImage.FromFile("ccorner.jpg");  
     
           //Set the size of image  
           textAndStyle.ImageSize = new SizeF(70,70);  
           lst.List.Add(textAndStyle);  
     
           //Add a image into the first cell.   
           row.Cells[1].Value = lst;  
     
           //Draw pdf grid into page at the specific location  
           PdfLayoutResult result = grid.Draw(page, new PointF(10, 30));  
     
           //Save to a pdf file   
           doc.SaveToFile(outputFile, FileFormat.PDF);  
             
       }  
       catch (Exception)  
       {  
           throw;  
       }  
   }

6. The following code encrypts the PDF document.

   private static void EncryptPDF()  
   {  
       try  
       {  
           //Create a pdf document.  
           PdfDocument doc = new PdfDocument();  
           doc.LoadFromFile(@"result.pdf");  
     
           //encrypt  
           doc.Security.KeySize = PdfEncryptionKeySize.Key128Bit;  
           doc.Security.OwnerPassword = "test";  
           doc.Security.UserPassword = "test";  
           doc.Security.Permissions = PdfPermissionsFlags.Print | PdfPermissionsFlags.FillFields;  
     
           doc.SaveToFile(@"Result_Encrypted.pdf");  
           doc.Close();  
           System.Diagnostics.Process.Start(@"Result_Encrypted.pdf");  
       }  
       catch (Exception)  
       {                  
           throw;  
       }  
   }

7. Save and run it. It will show output like the following.

Output

First it will show like the following to enter a password and click OK.

It will show like the following image.

Note: For detailed code please download the Zip file attached above.

Summary

I hope you now understand how to insert images into PDF documents programmatically and encrypt a PDF and make it password protected. If you have any suggestion regarding this article then please contact me.

The contents used are from Spire.PDF; for more information click here.