SUMMARY: To combine two separate PDF files into one document you need to drag the new pdf ON TOP OF an existing thumbnail until the grey border appears – then it will merge the two pdfs together.(You can then save the new merged pdf.) If you drag it into the sidebar but not on top of an existing page the new file will be added as an external link – not merged into the original pdf document.

Combining pdf documents on an Apple computer is easy.

There are lots of websites offering software to merge PDF files, but you don’t need a third party program to do it. OS X comes with a free application called ‘Preview’ that will open automatically whenever you click on a pdf file.

It turns out that Preview can edit and merge pdf files!

Exactly how you do this varies depending on which version of OSX that you have.

The concept is the same but the step by step pictures will look slightly different.

Please click on the version of OSX that you have to find out how to merge a pdf file: How to merge PDF files in Mountain Lion 10.8 (2012)How to merge PDF files in Mavericks 10.9 (2013)How to merge PDF files in Yosemite (10.10) (2014)How to merge PDF files in El Capitan (10.11) (2015)For all versions of OS X prior to Mountain Lion (10.7 and earlier) just follow the instructions below.

To join two or more pdf files together using Preview:1 Open the pdf file in preview.2. Drag a second pdf ON TOP OF an existing page thumbnail.

When you drag in step 3 it must drag to on top of the thumbnail, as in ...

This program is not the same as Adobe Acrobat Reader (which is only able to read/view PDFs). Under the "Add Files" area, click Browse to locate and add files to this compilation.

You can add them in any order, or you can add them in the order you want them merged.

I am trying to combine word documents comprising of a multiple number of files.