1. Create a one-page PDF and open it with Acrobat.

2. use "document->; Insert page ",insert a digitally signed document at the back of the page.

3. use "document->; Delete page ",delete the first page, and then save the document.

This method can not only keep bookmarks, but also completely remove digital signatures, and it is simple and easy to do without special software.

Secondly, I use Acrobat to add a digital signature to the PDF document:

1. Right-click the electronic signature and select "Clear Signature".

However, after clearing the signature, the location of the signature will also leave a blank box in the signature field. Click "Electronic Signature" in the menu and select.

Select "Prepare Agreement", select a blank signature field with the mouse, and press Del to delete.