Need to find where an image has been used? You want a reverse image search engine for that job. Upload your image or provide the URL for it, and a reverse image finder will check the web and see if it's been used anywhere else. This might be because you're concerned about your image being stolen and used inappropriately, or you might want to find similar sites that have used it, or you may be trying to find the original version of an image. There are plenty of tools to help you with this - Google Images offer you that option, and there's also Tineye but I've found ImageRaider. Provide details of the image(s) (it will check up to 20 of them in one go) and it will search Google, Bing, and Yandex to find duplicates. It takes a few minutes to work, but it's very effective and comprehensive with its results.