The TinEye bookmarklet allows you to search for any images appearing on the web page you are viewing, without having to go to TinEye first. Unlike the TinEye plugin - which allows you to right-click an image to search for it - the bookmarklet is a little script that is run from your browser's bookmark menu. When you click the bookmarklet, it submits the URL of the web page you are viewing to TinEye, fetches the images, and asks you to choose which image to search (just like when you paste a web page URL to the TinEye search page).

Source (tineye.com)

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