With the current PDFSign applications it is now also possible to use transparent images for the visible signature. However, it should be noted that not every PDF standard allows transparent objects. The following rules apply: Not PDF / A documents: The selected image (transparent or not) is used unchanged for the signature. PDF / A-1b … Continued
PDFSign can sign PDF, PDF/A, and ZUGFeRD documents with a X.509 certificate and maintains PDF / A compliance. Create a visible signature with multiple options, timestamp, self-signed certificates. Available as a command line, folder monitor or REST/SOAP web service application.