So here are our top picks for editing and creating PDFs on your Mac. Most of them aren't worth your time, but it's also quite difficult to get much done for free. These days there are too many PDF editors to choose from, and they all seem to do the same task. Adobe first introduced it in 1993, and later standardized it in 2008 to allow anyone to create PDF files and the tools necessary to do so. PDF is a familiar file format for most people.