function sc_signature() {
   return '<div id="signature"></div>';
}
add_shortcode('signature', 'sc_signature');

Last, define the style for the #signature id by adding the following code to your style.css:

#signature {
background:url(images/signature.jpg) no-repeat top left;
width:100px;
height:100px;
}

Note: You may have to edit the width and height to fit your image size.

Now, when you’ll want to insert your signature at the end of a post, simply switch WordPress editor to HTML mode and type the following:

[signature]

http://www.wefixwp.com/create-a-handwritten-signature-with-a-wordpress-shortcode/

Create a handwritten signature with a WordPress shortcode

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