
Thanks so much. Your explanation is brilliant. Easy to follow. Better than apple support itself. :)
OS X comes with a free application called ‘Preview’ that will open automatically whenever you click on a pdf file. Preview can edit and merge pdf files but the official Apple instructions are not quite right. Here’s how to do it depending on which version of OS X that you have.

You can merge PDF files using the built in ‘Preview’ application that comes for free with OSX, you don’t need 3rd party paid software.
The basic concept for merging 2 pdf files is the same for whatever version of OS X you have. You open the first file, view the page thumbnails, then drag the second file into the first file and save the new file. Exactly how this works varies depending on which version of OS X that you have. Apple have changed the details a few times. Sometimes there’s a green plus sign to indicate the merge. Sometimes there’s a grey border. If you don’t get it right the 2 files will not merge. You need to read the directions for the exact OS version that you have. (To find out which version of OS X you have just go to the Apple Menu and click ‘about this mac.’)
Please click on the version of OS X that you have to find out how to merge a pdf file:
How to merge PDF files in High Sierra (10.13) (2018)
How to merge PDF files in El Capitan (10.11) (2015)
How to merge PDF files in Yosemite (10.10) (2014)
How to merge PDF files in Mavericks 10.9 (2013)
How to merge PDF files in Mountain Lion 10.8 (2012)
For all versions of OS X prior to Mountain Lion (10.7 and earlier) just follow the instructions below.
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