Short description of iWatermark for Mac OS X 3.1.5: Protect and secure your photos. iWatermark is the easiest and most popular tool available for watermarking artwork, digital photos and other images that you can then put on the web or send via email. iWatermark can also create thumbnails. iWatermark provides a simple and efficient way to watermarking and creating thumbnails for images. It can process all the common image file formats.