Good tool. But, it doesn't have Yandex! You should add Yandex, because Yandex is the top reverse image tool right now. Google is second, and Tineye is third. Yandex searches for the image PLUS the mirror image.
This is absolutely superb I don't know why this doesn't have more ratings! Thanks for it, I was also planning on making an image reverse search tool then came across this. Would you be willing to collaborate, I want to add in functionality of right click and search. And add option of google image search engine?
I would also help you do a right click "search backgorund image" because when we right click we sometimes see "view background image" option in menu. But your crop idea is great for situation where there is a collage or something, its excellent and needs to remain.
I just want to add in support for urls and file urls.