Automator is a handy application included with Mac OS X - therefore, it should already be pre-installed on your computer. Here's how to rename many files together using this application.
Steps
Step 1. Open Automator
You can click on its icon on the launchpad or double-click in the Applications folder.
Step 2. Select “Workflow” and then “Choose”
Step 3. Click on "Files and folders" in the first column within "Library"
Step 4. Drag the files you want to rename to the top right of the Automator window
We recommend that you create a copy of a couple of files and test the app on them before continuing, in case the result is not what you want
Step 5. Double-click “Rename Finder Items” in the second column
Step 6. Decide if you want Automator to make copies of your files
If so, click on “Add”, otherwise click on “Don't add”.
In the next steps we assume that you clicked “Don't add”
Step 7. Decide if you want to add or replace text in the filenames
Select "Add Text" or "Replace Text" from the drop-down menu as needed.
Step 8. Add text if you like
Simply type the text in the text box.
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If you want to add text, select "After name", "Before name" or "As extension". By selecting "After", the name and text will be added to the end of the file name and before the extension.
Batch Rename Files in Mac OS X Using Automator Step 9 Step 9. Replace the text if you want
Type the text you want to find and the text you want to replace it with.
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If you are replacing the text select "Full name" or "File name only" or "Extension only". If you want the uppercase and lowercase letters to match, uncheck "Ignore uppercase and lowercase".
Batch Rename Files in Mac OS X Using Automator Step 10 Step 10. Click on the "Start" button in the upper right corner of the Automator window
If you are simply changing the name of the files, this is the last step. The file name should have been changed at this point.
Batch Rename Files in Mac OS X Using Automator Step 11 Step 11. Continue if you need to make multiple changes
If you want to make more than one change to the file names, such as adding text at the beginning of the name and text at the end of the name, click on the two "Xs" to close the Automator window. At this point, drag and drop the files back to Automator.
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