Adobe Reader: How to Highlight (or Unhighlight) Text in a PDF File This tutorial describes how to highlight.Įdit, e-sign and share PDFs on any desktop or mobile device. Highlighting texts or lines in a document allows users to identify important information quickly and easily. Whether you need to modify text, insert pages, swap images, or add a corporate logo, Nitro Pro gives you the power to make every PDF into a custom creation. However, I need to unhighlight some of the text I highlighted. I highlighted multiple lines of text within a document I’m creating.