croptool
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Show crop preview dynamically without page reload, allow crop adjustment on preview page
Well, there is no new page load, but I guess one could just disable the form instead of hiding it while working.
Regarding crop adjustments on the preview page, do you mean being able to reduce the crop area by making a new selection? Did you notice that you can press the "Back" button to make adjustments? The crop region is preserved.
Yes, I saw that you'd saved the crop, but its not necessarily obvious to users that that would be the case, and if you did need to crop further (like you'd missed a pixel border it might be nice to just adjust more from the same screen.