FlexiPDF offers you a number of predefined stamps (graphic labels) that you can insert, enlarge and combine with a comment window. You also have the option of creating user-defined stamps.
An example of the SIGN HERE stamp with the associated comment window
Note
▪Stamps are printed with the PDF if the check mark is set for "Print annotations" in the dialog box of the command File | Print. However, the contents of the comment window are not printed.