Most of the times when you are sharing PDF documents, it might be necessary that you watermark important ones. Batch PDF Watermark is a freeware tool which allows you to watermark multiple PDF files in one click. You can either select multiple files or select the folder containing PDF file. The application has option to add a text watermark or an image watermark. You can also set the position of watermark and preview them before actually processing them.
The interface is very similar to ribbon in Office 2010 and its easy to use as well.
The program offers time saving batch file processing for handling large numbers of files easily.