PicScout is a technology company focused on ensuring images may be easily tracked and monetized across the Web. PicScout currently maintains the industry’s most evolved image registry representing more than 140 million owner-contributed image fingerprints, enabling content providers, image buyers and technology partners to protect and promote image usage across digital platforms and devices.

Basically this is like tiny eye and you can use it to search for your images online to see if they have been pirated. The website allows you to search for single images free.