If you work with PDFs in, you will at some point want to know how to add or remove a watermark in Acrobat. A watermark is an image or text added in front or behind the contents of a document.

PDFs were designed to be a universal, easy-to-read document format, and they serve that purpose well. If you have a collection of images—say, documents you scanned into your computer as JPEGs—you can ...

You can't edit a PDF directly. You will need to open the PDF in Illustrator (whioch uses PDF as its native format, I believe) and then add the logo, and save as PDF. If you don't have the original ...