Add Watermark on PDF Photos is an iPhone application developed by Evgeniy Konev. This multimedia tool allows users to easily add text, logos, photos, or QR codes to PDF documents or photos. With the ability to render PDF pages as images, it ensures that the added watermark cannot be copied or removed using standard tools.

The application provides an intuitive editor that allows users to position, resize, and rotate the watermark using standard gestures. When working with text, users have the option to choose the font, color, and opacity. For photos, the opacity and the image itself can be adjusted. When working with QR codes, users can specify the code as a link or upload it as an image, and select the desired opacity.

One of the convenient features of Add Watermark on PDF Photos is the ability to save watermarks as stickers, eliminating the need to recreate them each time. However, it's worth noting that saved watermarks can only be used by users who have purchased the PRO version of the application. Users of the PRO version also have the privilege of duplicating watermarks.