Thus, productivity software makers started providing PDF editing tools. It didn't take long before users wanted to correct typos, replace old product logos with new ones, and even change fonts and layouts in their PDFs. Like any printed hard copy, it wasn't intended to be changed.

A PDF was supposed to be a virtual printout, the on-screen equivalent of hard copy. When Adobe introduced the PDF spec back in 1993, the whole idea was that you could work with PDF documents on screen the same way you worked with documents on paper. That's because the PDF format was never designed to be edited at all. If you've ever tried to edit a Portable Document File, or PDF, you've almost certainly discovered that it's a lot more trouble than editing a Microsoft Office document. How to Set Up Two-Factor Authentication.How to Record the Screen on Your Windows PC or Mac.

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