Step 1: Switch to numbering mode
Download Renamer4Mac if you haven't already done so. Launch Renamer4Mac and click Number to switch to numbering mode.Step 2: Drag in photos
Select the photos you want to rename in Finder and drag them into Renamer4Mac.
Step 3: Pick a label
Enter the common label for your photos (such as My summer holiday) into the Label textfield.
Step 4: Set the rename format
In the Text format drop-down list pick "Label - number"
And finally, click Rename to perform the rename.
