Top free Alternatives to Mass Watermark for Mac
Watermark 100s of photos within minutes
Mass Watermark is a simple but effective program that will allow you add a watermark - text or image - to your photo. It's winning card, however, is that it allows you to add this watermark to batches of images, rather than going through them one-by-one.
Mass Watermark also allows you to modify the images and text you are using for watermarking, and offers some basic optimizing of the final image.