I would like to know how to insert a image in the header for all pages of a document in Acrobat Pro XI, please.
Excuses my english language is not good.
Open the Tools Panel, select Pages > Background and "Add Background" from the dropdown menu.
You can then open a file in the Add Background dialog with your image and set its' position. When you are done it will by default apply that image to all pages.
Retrieving data ...