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
PDF/A and ZUGFeRD
PDFSign ensures that the PDF / A or ZUGFeRD conformity is maintained even when applying the (visible) signature.