This is an AppleScript that will lowercase all of your tags in Evernote
- Backup Your Evernote Notes.
- Open Evernote
- Click on 'Notebooks' to select it
- Go to the File menu
- Export All Notes
- Be sure the Format is 'Evernote XML Format (.enex)
- Open Script Editor
- Copy and paste this script into the window or just open the file if its saved on your hard drive
- Go to the View menu and ensure that the Log window is shown
- Switch tabs in the Log window to 'Events'
- Press the Play button to execute the script
The script will output the results to the Events window showing you a before and after.