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Fairly simple really, I just want people to be able to drag an image onto another image, position it where they want by dragging it around, and then when they're happy with it, click a button to save it (on my server) as a file (preferably a PDF or PNG).

This may sound like a simple, beginner's question, but I am not asking HOW to accomplish this, just what the best technology currently is (JS, HTML5, something else, maybe some existing libraries ala jQuery). I have been focusing on back-end stuff for a few years and am TOTALLY out of touch with what is the best way to do this. I don't want to use Flash, I know that.

I'm looking for a method that is both cross-platform, and easy enough to learn, or preferably if there are good libraries I can adapt easily.

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Generally, "what language should I use?" questions are not constructive as you tend to get a list of people's favourite without any explanation of why it might help. – ChrisF Aug 1 '11 at 12:22

I would say jQuery with a PHP backend. jQuery will handle all the dragging and dropping, and PHP will handle saving the result. There are many tutorials written on this subject for those technologies.

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