When you add a comment to a PDF, it's akin to putting a piece of paper under a pane of glass and writing comments on the glass.

They only let you add comments to the PDF file-either boxed Post-It-style notes or lines and text boxes that appear on a layer above the PDF's actual contents. While many apps call themselves PDF editors, they can't actually edit the text and graphics in a PDF file. If you want to add more text than will fit on the page, we offer some tips in a later section, but don't expect perfect results. Instead, you need to resize the fonts on page one or change the size of the box that contains the text. That means you can't add a few lines of text in the middle of a page one, for example, and make the remaining text flow smoothly into page two, as you can in a word processor.

The PDF format was devised before everyone started using web browsers and is based on the printed page. Best Hosted Endpoint Protection and Security Softwareīut first, it helps to understand challenges you're up against.

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