May be you are referring to watermark. I hope you know how to create a pdf from word. Then prior to creating a pdf add watermark in MS word. Or if you are already having a pdf document without a word file. you might need a software like nitropdf or Adobe acrobat professional.
How do I remove the logo of one PDF file?
To remove a logo on a PDF file you can do two things Get licensed Adobe Acrobat DC and remove the logo Using the licensed Adobe Acrobat DC open the PDF file and perform the steps below Got to Tools Edit PDF Watermark Remove Watermark The watermark will be removed. Save the PDF file without Logo watermark. Using SysTools PDF Watermark Remover perform the steps below Add PDF file into the application Browse destination to save PDF without Logo watermark Click Next Remove button to remove Logo watermark from selected PDF file Go to the destination to view PDF without logo watermark