Nowadays, PDF has become one the most common file format for distributing and sharing, as PDF files have a variety of advantage features like security, compact size and compatible with any platform, Windows, Linux and Mac OS. For Windows users, you have to download a third party program to create PDF; luckily, Mac users can use a free Mac PDF creator - Preview application, which is default installed in all Macs, to create PDF on Mac OS X effortlessly.
Below is how:
1. Open the file you want to create to PDF;
2. Click File > Print;

3. Click PDF button and choose Save as PDF option at the bottom of the pop-up box.

Then you can enter a descriptive name and choose a file folder as the location for created PDF files. Just in three simple steps, you can create PDF on Mac with Preview application in seconds.
Actually, the Preview application can not only create PDF on Mac OS X, but also allows Mac users to annotate PDF, print multiple images on one page, highlight text in PDF on Mac, add text to images, merge many PDF files to one, and more. However, it's a bit pity that it doesn't support to edit PDF text on Mac and you need to download another third party software if you want to edit text in PDF.

