If it is your first time to sign PDF file, just click Place Signature. If you don’t want to use it again, click Place Initials – Clear Save Initials to remove initials. Now scroll your mouse and click on somewhere of your PDF file, the signature will be created. When you choose Place Initials first, type or draw your initials in pop-up window “Place Initials”. There are several options to choose, Place Initials, Place Signature. Step 2: At the top right side in Acrobat, click the Sign. Step 1: Open the PDF document in Adobe Acrobat XI Pro you want to sign. Are there any problems? Please follow the steps to add signature by typing or drawing or importing signature image. PDF document signature can be text, image, digital ID or any other words or picture you draw. Part 1: Add Text or Image Signature to PDF document Use a certificate to digitally sign PDF file.Add text or image signature to PDF document.So how can I digitally sign your PDF file or add signature to PDF document in Adobe Acrobat Pro? The following passage will give you an answer. Especially for important PDF file, it seems to be necessary. And solve the problem about PDF file’s belonger at the same time. Signature to PDF file explains its ownership to some extent.