Add an image to an existing PDF file with iText7

Question

I want to add an image to a specific position inside an existing PDF file using iText7.
In a different project using iTextSharp, the code was very simple:

iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(new Uri(fullPathSignature));
// Set img size and location on page
//-------------------------------------
// item.Width, item.Height
img.ScaleAbsolute(120, 62);

// left: item.X bottom: item.Y
img.SetAbsolutePosition(25, 25);
//-------------------------------------

//Add it to page 1 of the document,
PdfContentByte cb = stamper.GetOverContent(1);
cb.AddImage(img);

But I do not find the correct way to do it with iText7.
I have a PdfReader and a PdfWriter but where can I find the PdfStamper in iText7?
Or maybe there is a different way to add an image to an existing PDF file in iText7?
(I can't use iTextSharp in current project)

Solution

In iText7, there is no PdfStamper anymore. PdfDocument is responsible for modifying the contents of the document.

To add an image to a page, the easiest way is to use Document class from layout module. With that you almost don't have to care about anything.

To add an image to a specific page at a specific position, you need the following code:

// Modify PDF located at "source" and save to "target"
PdfDocument pdfDocument = new PdfDocument(new PdfReader(source), new PdfWriter(target));
// Document to add layout elements: paragraphs, images etc
Document document = new Document(pdfDocument);

// Load image from disk
ImageData imageData = ImageDataFactory.Create(imageSource);
// Create layout image object and provide parameters. Page number = 1
Image image = new Image(imageData).ScaleAbsolute(100, 200).SetFixedPosition(1, 25, 25);
// This adds the image to the page
document.Add(image);

// Don't forget to close the document.
// When you use Document, you should close it rather than PdfDocument instance
document.Close();

Comments

[Mina Shtraicher]

Thanks Alexey, I tried your suggestion and I get a NullReferenceException: object reference not set to an instance of an object.

[Alexey Subach]

@MinaShtraicher that's very strange because the solution is very simple and worked for me. There is literally no place for NullReferenceException. Are you sure you are passing correct imageSource. Which operation causes the exception?

[Mina Shtraicher]

When I get to "document.Add(image);" I get object reference not set to an instance of an object. My code: iText.Kernel.Pdf.PdfDocument pdf = new iText.Kernel.Pdf.PdfDocument(reader, writer); iText.Layout.Document document = new iText.Layout.Document(pdf); float x = 25; float y = 25; float w = 120; float h = 62; ImageData imageData = ImageDataFactory.Create(new Uri(fullPathSignature)); iText.Layout.Element.Image image = new iText.Layout.Element.Image(imageData).ScaleAbsolute(w, h).SetFixedPosition(1, x, y); document.Add(image);

[Mina Shtraicher]

The imageSource is valid. It worked for the code I wrote in iTextSharp in the other project.

[Alexey Subach]

Can you share the PDF you are trying to modify?

[Mina Shtraicher]

Sorry, I found some previous code I forgot to comment which closed the document. It's working fine now. :)

[douglas rouse]

This solution works for most image types but will not work with PNG files with transparency

[Gajendran Mohan]

Image image = new Image(imageData), I cannot do this it says Image is abstract did they changeany thing in recent

[B. Clay Shannon-B. Crow Raven]

I tried it with the "@" sign and the full path to an image, like so "@"C:\IdioSynchronizer\Development\axXAndSpaceLogo.jpg"", and it failed. Replacing "Imagesource" with that was the only change I made. I get, "Cannot draw elements on already flushed pages" and then the generated PDF won't load.