How do I delete an existing signature in PDF?

This article explains how to remove the signature from PDF.

If you are using Adobe Pro use this method:

1.) In Acrobat->Tools->Protection->More Protection-> Security Settings

2.) Go to Select Digital IDs on the left and then select the digital ID to remove.

3.) Click Remove ID, and then click OK.

If you are using Adobe Acrobat Reader

Go to Edit-> Preferences-> Signatures

Under the category Identities & Trusted Certificates, click More.

Then find the signature you want to erase and click on it once.

Then click on Remove ID.