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How to batch file extensions on Mac OS



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

Now locate the files or the file folder to change your extensions with Finder and select them all. Then right-click and select "Rename XX Items ..."



On the "Rename Finder Items" screen, choose "Replace Text" and then in the "Search:" section, place the original file extension and under "Replace with:" place the replacement file extension . Then click on "Rename"


Assuming that you followed the above steps correctly, you have successfully changed only the bundle extensions of selected files, without changing the bundle names.

In the previous example we changed a group of image files that had an original extension ".jpeg" to have a ".png" file extension, but you can use this with any file extension. The extension you choose does not matter, although you will obviously want to choose one that is compatible and accurately represents the type of file so that it can be recognized by applications without problems.
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