This example was written in answer to the question Click How to extend the page size of a PDF to add a watermark?
addextramargin
##GITHUB:https://github.com/itext/itext-publications-examples-java/blob/develop/src/main/java/com/itextpdf/samples/sandbox/stamper/AddExtraMargin.java##
##GITHUB:https://github.com/itext/itext-publications-samples-dotnet/blob/develop/itext/itext.samples/itext/samples/sandbox/stamper/AddExtraMargin.cs##