Open a pdf file, as shown.

Click Advanced Signature, and then click Verify to place the signature.

Click OK in the pop-up window, and according to the window prompts, drag a rectangular box where the signature is placed on the page with the mouse.

Jump to the sign document dialog box, where there is a signature and enter the password.

As for how to make a digital encryption certificate, please see the following Baidu experience!

1 how to add digital certificate encryption to pdf

After entering the password, there is a preview window below. You can click the signature to lock the document so that no one will change it. Click on the signature.

Directly prompt to save the file as, you can choose your favorite name. Click Save.

A digitally signed pdf has the following effects.