The first icon of the left toolbar is for text selection. Preview offers many editing tools, you can highlight, underline, strikeout, and add text, etc. You can also open the markup toolbar by clicking on the 'pen point' icon on the top-right of the Preview interface. Go to the 'View' menu on top and select 'Show Markup Toolbar'. On the opening menu, choose 'Open with' > 'Preview'. Find the target PDF file you would like to edit and right-click on it.
Now we'll show you how to edit a PDF for free on Mac with the Preview app. On a Mac computer, users don't have to install specific applications before they can read documents including PDF, Word, Excel, PPT, images, etc and do some basic editing. How to Edit PDF on Mac for Free Option 1.