Certify/Sign a PDF invisible

[jihenekaiser]

I could not find any information regarding "sign PDFs invisible" on the webpage. It says that it should be possible automatically to sign invisible, but as per the image attached, I can only choose between "Digitally sign" and "Time Stamp". It was no problem to set up our Digital ID, nor to sign regularly.

Do you know if I need to add/change something beforehand?

Thank you!

[Bernd Alheit · Accepted solution]

It is possible with Adobe Acrobat, not Acrobat Reader.

[jihenekaiser]

Thank you! That was very helpful.