Adobe's PDF format has support for document footers. You can use this capability to add a footnote to up to three different areas at the bottom of a PDF document ...

PDFs are tricky to edit without the right tools. While some of them are pricey, a few free ones can get the job done, too. Here's what you need to get—and know. Our team tests, rates, and reviews more ...

A PDF is a suitable file format for creating and reading e-books. However, if you want to open an e-book in most e-readers, like the Amazon Kindle and B&N Nook, you must first convert it to an EPUB.