Replace image in an existing PDF file using C# and VB.NET.
Syncfusion Essential® PDF is a .NET PDF library used to create, read, and edit PDF documents. Using this library, you can replace image in an existing PDF document using C# and VB.NET.
Steps to replace image in an existing PDF programmatically:
- Create a new C# console application project.
- Install the Syncfusion.Pdf.WinForms NuGet package as reference to your .NET Framework application from NuGet.org.
- Include the following namespaces in Program.cs file.
C#
using Syncfusion.Pdf; using Syncfusion.Pdf.Graphics; using Syncfusion.Pdf.Parsing;
VB.NET
Imports Syncfusion.Pdf Imports Syncfusion.Pdf.Graphics Imports Syncfusion.Pdf.Parsing
- Use the following code snippet to replace image in an existing PDF document.
C#
//Load the PDF document
PdfLoadedDocument loadedDocument = new PdfLoadedDocument("Input.pdf");
//Load the PDF page
PdfLoadedPage loadedPage = loadedDocument.Pages[0] as PdfLoadedPage;
//Create an image instance
PdfBitmap image = new PdfBitmap("Essen PDF.jpg");
//Replace the image
loadedPage.ReplaceImage(0, image);
image = new PdfBitmap("Essen DocIO.jpg");
loadedPage.ReplaceImage(1, image);
image = new PdfBitmap("Essen XlsIO.jpg");
loadedPage.ReplaceImage(2, image);
//Save the document
loadedDocument.Save("ReplacedImage.pdf");
//Close the document
loadedDocument.Close(true);
//This will open the PDF file so, the result will be seen in default PDF viewer
Process.Start("ReplacedImage.pdf");
VB.NET
'Load the PDF document
Dim loadedDocument As New PdfLoadedDocument("Input.pdf")
'Load the PDF page
Dim loadedPage As PdfLoadedPage = TryCast(loadedDocument.Pages(0), PdfLoadedPage)
'Create an image instance
Dim image As New PdfBitmap("Essen PDF.jpg")
'Replace the image
loadedPage.ReplaceImage(0, image)
image = New PdfBitmap("Essen DocIO.jpg")
loadedPage.ReplaceImage(1, image)
image = New PdfBitmap("Essen XlsIO.jpg")
loadedPage.ReplaceImage(2, image)
'Save the document
loadedDocument.Save("ReplacedImage.pdf")
'Close the document
loadedDocument.Close(True)
'This will open the PDF file so, the result will be seen in default PDF viewer
Process.Start("ReplacedImage.pdf")
A complete working sample can be downloaded from ReplaceImageSample.zip.
By executing the program, you will get the PDF document as follows. 
Take a moment to peruse the documentation, where you can find other options like inserting image in a new and existing PDF document, vector image, image pagination, transparency, and rotation to the image with code examples.
An online sample link to replace images from an existing PDF document.
Refer here to explore the rich set of Syncfusion Essential® PDF features.
Starting with v16.2.0.x, if you reference Syncfusion® assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to link to learn about generating and registering Syncfusion® license key in your application to use the components without trail message.
Conclusion
I hope you enjoyed learning about how to replace image in an existing PDF file using C# and VB.NET.
You can refer to our WinForms PDF feature tour page to know about its other groundbreaking feature representations. You can also explore our WinForms PDF documentation to understand how to create and manipulate data.
For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion®, you can try our 30-day free trial to check out our other controls.
If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!
