Search By Image Extension for Chrome Lets You Image Search Google from Any Page
Chrome: Google recently announced you could reverse image search its database by uploading an image or pointing the engine at an image URL. With the Search By Image extension for Chrome, you can right-click on an image to send it through Google Image Search without copying the URL or uploading the image.
Search By Image adds a “Search Image on Google” entry to your right-click menu after installation that you’ll see whenever you right-click an image on any web page. For those familiar with similar service TinEye and its browser extension, Search By Image works the same way. If you find yourself wondering where a wallpaper or image on a blog is really from, this extension can save you a few steps in finding out. Firefox users can try the Search By Image Firefox extension to get the same effect.
Search by Image for Google | Chrome Web Store