How to Hide all File Extensions on Mac?

How to Show or Hide File Extensions in Mac OS X

The simplest is to go to the Finder > Preferences menu, select the Advanced tab , and check the "Show all filename extensions" box. All your file extensions should now be visible easy as pie. Conversely, if you want to hide your file extensions, just uncheck the box.

How do I Hide Filename Extensions?

In the Start menu search, type folder options.
In the Folder Options window, click the View tab.
Remove the check from "Hide extensions for known file types."
Click OK.

How do I Get Mac to Show all File Extensions?

Start a search with Command+F.
Click on the + icon on the far side of the taskbar.
Select the type from the kind pulldown menu. Select other and then find File extension