This extension has been great, but one unfortunate change is that ever since Google updated its image search framework, searching via Google Image Search hasn't worked properly - an attempted search just goes to the Google Image Search homepage, but doesn't actually pass through the image or perform the search.

Provides every engine imaginable.

A must have add-on if you use reverse image search even occasionally. This is truly a cool feature. It is saves my time mostly.

A must have add-on if you use reverse image search even occasionally. Moved recently from "Image Search Options" by Xamayon

Nothing not to love - does exactly what it says it does. While the image search platforms themselves may not always yield the results you want, Search by Image is a handy shortcut to have, and much faster than going to those sites manually. For me, it was something I didn't think I'd need until I needed it.