Open the PDF you’d like to see double in Preview. Then go to Preview’s File menu and choose Print. From the PDF menu button in the lower left corner, choose Open PDF in Preview (not Print as PDF).

How to search a PDF on Mac. 1. Find the PDF you want to search and open it. If you don't have Adobe Reader on your Mac, it will likely open by default with Preview.

Step 1: Open the PDF file in Preview. If Preview is your default viewer for PDFs, simply double-click the file. Otherwise, right-click the PDF, move to Open with, and pick Preview.

Sometimes it'd be handy to view a single PDF file in two windows. But generally speaking you can't open the same document twice in a single app. Here's a way around that restriction.