Used PhotoBulk Lite for Mac?
Developer’s Description
Create your own unique watermark with a variety of settings: choose Font, Style (Bold, Italic, Underline), adjust the Opacity and the Color of the text, control angle and position of your logo in live-preview box. The app is as easy as dragging a batch of images from one window to another and hitting Start button, literally.
Whether you are a professional photographer wanting to keep your images protected in the open Internet, or a regular user who doesn't want his images to be used by others, PhotoBulk Lite is exactly the app that you were looking for.