Tutor for Preview for the Mac Have you ever wanted to resize an image with your Mac? Or change an image from a JPG to a PNG? How about combine multiple PDFs into a single PDF? With the Preview app on the Mac you can do this and more! The Preview app not only opens PDFS and images, but it also allows you to annotate and edit them. This includes highlighting and adding text, editing, resizing, and combining documents. With Tutor for Preview we show you how to get the most out of Preview.