How to Combine Multiple PDF Files into One File

Are you a MAC user and you have multiple PDF files that you want to combine into one big file without using third party software?  Here is a simple steps to do this:

1. Open a PDF in Preview.

2. If you want to save it as another file Click File > Duplicate then save it as a new file.  [if not proceed to step 3]

3. Choose View > Thumbnails to show page thumbnails in the sidebar.

4. Scroll down up to the last page to indicate where to insert the other document, then select a page thumbnail. 

5. Choose Edit > Insert > Page from File,* select the PDF that you want to add [note: you can select multiple files by pressing Command key while choosing the PDF files, then click Open. 

6. To save, choose File > Export as PDF. [or Simply save the file as is]

7.  Now you have one big file of PDF docs into one.

I hope it helps.