How To Display Filename Extensions On Mac

By default, OS X hides the extensions of filenames. If you would like to display filenames extensions follow below instructions.

Displaying File Extensions

Step 1: Open a new "Finder" window on your Mac.

Step 2: In the Menu bar, go to Finder > Preferences.

Step 3: Click on the "Advanced" tab.

Step 4: Select the box that says “Show all filename extensions”. If you want to hide file extensions, just uncheck the box.

It’s as simple and quick as that.