IMPORTANT:
To be able to sign a PDF document, it is necessary to have a digital certificate installed on your computer, such as the T-CAT on card or T-CAT P. In the case of T-CAT on card, check if you have correctly configured your computer* for the use of the card and remember that you must have the card inserted in the reader.
Open the PDF with Adobe Acrobat (Reader or DC) and follow these steps:
1. Go to "Tools" or "All tools" and select "Certificates" or "Use a certificate":
If you can't find it, you can also search with the magnifying glass:
2. Select “Sign digitally” and accept the dialog box
3. Select the space where you want to insert the signature, dragging the mouse around the document.
4. Select below your T-CAT certificate with which you want to sign:
5. Finally, the signature will look like this:
According to current regulations, the ID of the holder must appear in the "Common name" field of the certificates. If you want to hide it from the signature of a PDF, you can consult " How to hide the DNI of the T-CAT signature stamp in PDFs ?".