Image cropping/resizing before sending to a server

I am searching for a solution that will allow a user to upload an image, crop the image, and then send the updated image to the server.

Basically, I would like to handle all 开发者_Go百科the editing client side and only send the new, smaller, thumbnail to the server.

How can I do this? I have seen this is possible with Flash, but I am looking for alternative solutions.

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Are you restricted to certain browsers? Using HTML5, here is a proof of concept from Anand Venkataraman. Demo is here.