You can try Graphic Converter for free
Apple photo software - Mac picture editor, photo editor, image editor, graphics conversion
You can try Graphic Converter for free
Apple photo software - Mac picture editor, photo editor, image editor, graphics conversion
Another thing to look into is Automator, which should be in your Applications folder. You can easily build Automator workflows to automate just about any task.
How To Use Automator To Batch Rename Images on Mac