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Reverse image search is a content-based image retrieval query technique that involves providing with a sample image that it will then base its search upon. In another words, with Reverse Image Search tool, you will quickly discover visually similar images from around the web.
How it works?
Just enter a link where the image is or upload an image from your desktop to Google Images or to any other Search Engine listed below and it will show you related images used on other websites and also different sizes of the same image almost instantly.
Site Owner as well as Webmaster and even Journalists can use the reverse search option to find the original source of an image or to know the approximate date when a picture was first published on the Internet.