1. Open Preview. Preview is Apple's native image viewer app that's automatically included with most versions of Mac OS. You can open Preview by double-clicking ... 2. Open a PDF in Preview. You can navigate to the PDF file on your computer and double-click it to open it in Preview by default, or you can use the following ... 3. Click File. It's in the menu bar at the top of the screen. This displays the drop-down menu.
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