TinEye - Image Search Engine

TinEye is the first image search engine on the web to use image identification technology rather than keywords, metadata or watermarks. It is free to use for non-commercial searching.You can submit an image to TinEye to find out where it came from, how it is being used, if modified versions of the image exist, or to find higher resolution versions.

TinEye regularly crawls the web for new images, and we also accept contributions of complete online image collections. To date, TinEye has indexed 1,546,003,573 images from the web to help you find what you're looking for.

When you submit an image to be searched, TinEye creates a unique and compact digital signature or 'fingerprint' for it, then compares this fingerprint to every other image in our index to retrieve matches. TinEye can even find a partial fingerprint match. Our fingerprinting technologies have been developed by Idée Inc..

http://www.tineye.com/