Search by Image
Search by Image is a Chrome add-on for Google that will help perform reverse image search on the web.
You can right-click any image on a website and the Search by Image add-on will help you discover more images that are visually similar and also images that are exactly similar but of different sizes and resolutions.
You can use Search by Images extension to find the original source of an images (for attribution purpose), to find other websites that are reusing your photographs or even to figure out where an image for taken.
You can also perform Reverse Image Search on images that are stored on your local disk by uploading them to the Google Images website.