Don't miss the simple utility from Rennie Glen Software, Easy Bates, which is a fast and easy way to Bates stamp a set of documents.
Available for download here, Easy Bates lets you set a Bates number:
. . . and drag a set of document images into Easy Bates to process:
It conveniently gives you the option to rename both the pages or the documents themselves based on the Bates number you set.
It includes an option to remove Bates stamps, and can even create label sheets with Bates numbers, in case there's anyone out there who is still doing that.
Easy Bates gets you fast results with minimal effort.