Automator is Apple’s application for creating workflows. You can think of it as a way to perform the same repetitive tasks over and over again. Automator is often overlooked, especially by new Mac users, but it has some powerful capabilities that can make using your Mac even easier than it already is.
How to Batch Rename Files on Mac – Using Automator
The Rename Files and Folders workflow in Automator can create sequential file or folder names. It's easy to use this workflow as a starting point and customize it to your needs.
Launch the Automator application. It is located in the Applications folder.
In the window that appears when you first open Automator, select New Document.