Merge PDF files in Mac OS X – for free

If you ever wonder how to merge two PDFs into one there is a very simple solution.

Select PDF files you want to merge and open them with Preview. Open Side Bar (Shift-Command-D). Rearrange pages by dragging them in correct place. After you are done choose:

File -> Print Selected Pages...
PDF -> Save as PDF...

And you are done. All the pages will be printed into single PDF file.