The answer to this question is quite simple. Using Google Docs is, by far, the fastest and most straightforward way to convert and edit PDF files. Literally converting a PDF file takes seconds. There are dozens, if not hundreds, of online software that offer the same service. Some of them, like smallpdf.com, viewpdf.com, and pdffiller, are pretty convenient, but they come at a price. With Google Docs, you don't need to keep track of free trials. Also, as a Google product, "Docs" is one of the most reliable ways to convert your files.