
For instance, you want to hide your personal phone number from a PDF file before posting it on the web or want to annotate a page with sticky notes. There are situations when you need to make only minor changes in a PDF file.

If you are looking to manipulate the PDF file structure itself like rearranging pages or merging multiple PDFs into one, please refer to the previous Adobe PDF Guide. This article will primarily focus on tools that let you alter the actual contents of a PDF file.

While PDF Files are “read only” by default, there are ways by which you can edit certain elements* of a PDF document for free without requiring the source files or any of the commercial PDF editing tools.
