How to Join Multiple PDF Files Into a Single PDF Document in Mac OS X
If you have multiple PDF files that you want to combine into a single PDF file, you can rely on the Macs bundled Preview app to accomplish this. Not only can Preview combine a variety of single or multi-page PDF docs into a single file, you can even add images as pages, remove a page from an existing file if it’s unnecessary to have in the joined doc, or rearrange the pages of the joined files to be reordered according to your needs. The end result will be a single merged PDF document that contains every page and input file that you need.