Disable confirmation dialog when changing File Extension in macOS Finder Every time I change a file type in Finder, I'm forced to confirm that I actually want to change the file extension.


Are you sure you want to change the extension from &quot;.old&quot; to &quot;.new&quot;?
If you make this change, your document may open in a different application.
Keep .old Use .new

How can I stop going through this confirmation step?
Finder > Preferences > Advanced


  Show warning before changing an extension




Uncheck this option to disable the warning confirmation dialog when changing or renaming a file extension in the macOS Finder.