If you want to change the contents of an existing PDF file and add extra content such as watermarks, pagenumbers, extra headers, PdfStamper is the object you need. Var stamper = new PdfStamper(reader, outputPdfStream,'1',true) I am trying to put the image on the existing document, not a copy of it, which in this case matters.Īlso, by signature, I mean handwritten, not pin numbers.ĮDIT - Can PdfSignatureAppearance be used for this? Merely copying the PDF will not corrupt it but the process below will.
In case it matters I am using a Topaz signature pad to create my signatures, which has it's own security. This means the signatures, while they show up on result.pdf, have an icon next to them that state "invalid signature." When the document is copied like this (into result.pdf) those signatures, while still present, have a different byte count or other item that is corrupted. It works great, but the problem for me is that the existing PDF has digital signatures on it. There are many PDF files like this that need an image.Įdit - I am very thankful for the code below. This original changes and the name "original" only means the source file in this context. I do not want to open, read, replace, and delete the original. I need to be able to take an existing document and put an image on it. I have tried but it corrupts the document. I want to take an existing PDF and insert an image into either an image field or as the icon image of a button. I have read the documentation and looked at many examples but they all create new documents and insert an image. I have an existing PDF and I can use FdFWriter to input to text boxes.
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