Replace Image in Existing PDF File

The Images collection’s Replace method allows you to replace an image in an existing PDF file.

The Images collection can be found in a page’s Resources collection. To replace an image:

1. Open the PDF file using the Document object.
2. Replace a particular image, save the updated PDF file using Save method of the Document object.

The following code snippet shows you how to replace an image in a PDF file.

// Open document
Document pdfDocument = new Document("input.pdf");
// Replace a particular image
pdfDocument.Pages[1].Resources.Images.Replace(1, new FileStream("lovely.jpg", FileMode.Open));
// Save updated PDF file
pdfDocument.Save("output.pdf");