How to Add an Image to a PDF with Preview on Mac May 16, 2021, 9:30 am EDT | 1 min read The Preview app on the Mac doesn’t make it easy to add an image to a PDF file, but there’s a clever workaround you can use with Preview itself, and we’ll show you how to do it. Note: You Don’t Need This to Add a Signature Image Before we begin, it’s worth noting that if you want to add your signature to a PDF, you don’t need to use the method outlined below. Preview has a built-in option to add a signature, and you should use that to sign PDFs on your Mac.