Can I add customer sign at invoice pdf? Jay K April 22, 2017 04:56 Updated Follow You can add a signature for a particular invoice. To use this signature inside PDF you must select “Customer Signature” from Company Signature 1 or 2. You can add a signature from Invoice details page by click on “Sign” button. - Moon Invoice Related articles Which are the different status of Invoice? Comments 0 comments Please sign in to leave a comment.