These features are built into the Preview application that comes with all Mac OS computers. See OS X. Combining PDF documents using Preview . Preview will also open JPG files by default (just double click on them) so you can mix them with PDF files as well.
This process is called “combo editing.” You can't do this with Microsoft Word, or the free Adobe InDesign or Illustrator programs, because neither allows you to open and edit PDF files. Open and edit a PDF at the same time using Preview. You can also run multiple instances of Preview simultaneously, for a more seamless workflow. You can even open multiple PDF files at the same time using Preview for Mac. This can help you save a lot of time: In the example above, I printed 12 copies of this same tutorial. Using 2 Preview instances would have taken 10 hours. How to change the font size on any PDF document. You can change font sizes for any PDF document using Preview. If you're not satisfied with the font sizes in the Preview view of a PDF document, you can select the font sizes to change in Preview at any time using the Fonts.