You can get away with using the camera on your phone or tablet if it's an old one (not many megapixels) and by having the phone or tablet far enough away from the coin to produce an image you can crop on the device to get it down to below the maximum size. I've stopped using Pixlr and my images get posted ok. Make a note of the filenames if there's more than one to post or you'll make the same mistake as me and put the same pic up twice! Have fun! And good luck!