Here's a tutorial on how to easily change a batch of files on Mac.
Remember that this only changes the file extension and not the file type is changed, or any conversion thereof is performed. It is also worth mentioning that this does not change filenames, it is only changing the extension that comes as a suffix of it.
We will use the same function of renaming batch files on Mac but with slight modifications. It's a subtle difference, but important, if all you want to do is keep the file names but change the file extensions.
How to batch file extensions on Mac OS
- From Finder, scroll to the menu and go to "Preferences" and then go to "Advanced"
- Check the box labeled "Show all file name extensions" and uncheck the box labeled "Show warning before changing an extension" then close the Finder preferences panel