From Plum Amazing:
iWatermark is the most popular professional watermarking tool for photos. Easily, secure and protect your photos with a text, graphic, signature or QR watermark.
Once added to a photo this visible watermark displays it is created and owned by you. Features: Works with Lightroom, Photoshop, Picasa, ACDSee, iPhoto, Aperture and other photo organizers. Batch processing or sequential * Input/Output to all major file types JPEG, TIFF, PNG, RAW, etc. * Create text, graphic, or QR watermarks * Adjust opacity, font, color, border, scale, rotation, shadow, special effects, etc. * Use metadata (GPS, Exif, XMP) as watermarks * Design, edit and manage a library of watermarks * Export watermarks and use in the Mac version * Fast 64 bit multi-threaded multiple CPU/GPU’s * User selectable color profiles * Add, remove and edit metadata (EXIF, GPS and XMP). * Unlimited fonts * Great Manual and support * Share to Facebook, Flickr, Instagram, Twitter and many more * Always being improved A watertmark is like signing your name to a photo and subtly displays it’s yours. Why Watermark? – Digitally sign your photos/artwork with iWatermark to claim, secure and maintain your intellectual property and reputation – Photos can go viral then they fly off globally. Watermark with name, email or url so your photo has a visible and legal connection to you – Build your company brand, by having your company logo on all your images – Promote your company, name and website by using QR codes as watermarks – Avoid the surprise of seeing your photos and/or artwork elsewhere on the web or in an ad – Avoid conflicts, costly litigation and headaches from plagiarists who claim they didn’t know that you created it – Avoid intellectual property (IP) squabbles.