iWatermark is a powerful and handy watermarking program for Mac and Windows that allows you to create and apply wonderful watermarks to your copyright documents and images. This great application enables you to digitally sign your images, artworks, photos, pictures, etc. and avoid any kind of intellectual property problems. It supports the following readable image formats: PEG, TIFF, PNG, Photoshop, PICT, and BMP. The program not only lets you create watermarks, but also convert the images file format, and create thumbnails of your images. It also has the ability to create filters before processing in relation to the files size, name, type,etc., as well as comments and keywords. It also allows you to apply the same watermark to multiple images at once and scale your images to be the same size. It also offers a transparency feature that allows you to preview how the watermark affects your image. Thanks to its built-in previewer, you can view the changes made on your images before applied and undo them if you are not satisfied. You can also rotate and place your watermark wherever you want, as well as apply special effects such as shadow, aqua, and emboss. Other powerful feature include the ability to embed IPTC information into the image, which can be read by most image editing programs.