With some extra work, you can add text to PDF files that aren't fillable by selecting the "Show Markup Toolbar" button, which resembles a pen tip in a circle, on the Preview toolbar.

Removing text from a PDF isn't as easy as drawing a black bar across it. Fortunately, redaction tools let you truly erase sensitive text in Preview, Adobe Acrobat DC Pro, and PDFPen.

In other words, Adobe Reader won't let you add text. What you need is a program that's a little more accommodating, PDF-wise. Try Foxit Reader 4.3, which allows you to add text to any PDF .

To search a PDF on your Mac for a specific word or phrase, you can use the search function in the built-in Preview app. Business Insider Subscribe Newsletters ...