With this online tool you can easily add a PDF-stamp to PDF files, as a background or as an overlay. All you have to do is upload your file here in the browser, add a PDF-stamp and click 'Start'.
How to add a PDF-stamp to a PDF file
Choose or drop the PDF file to which you want to add a PDF-stamp
Choose the PDF file which should be added as a stamp
Choose if the stamp should be added as a background (behind the text) or as an overlay (above the text)
Click on 'Start' below
After a few seconds you can download your PDF file with the stamp added