We've all dealt with a number of PDF files in our life, and while they have a lot of perks, they also have one huge downside: it's not that easy to combine them. With no quick way to edit a PDF ...

Ever tried to open two PDFs side-by-side in Preview? The app normally only lets you open a single copy of a document, so if you want to keep open a second copy—say, for easier footnote retrieval ...

You can take a lengthy PDF and turn it into separate files or combine two or more PDFs into one. Here’s how to split and combine PDFs on Mac using Preview.