Draw yourself a cookie, and this customizer will make a cookie cutter for it. The cookie cutter will have a 0.5mm cutting edge, 1mm thick walls and a 3mm wide by 2mm deep lip around the top.

You can either draw a cookie in the customizer, or upload an image file. Drawings are faster, but I find them a bit clumsy. Images are slower, but more accurate, and with images you can have holes in your cookie, inside cutters will be made to cut them.

Updates: Cookies are now cut the right way round, rather than a mirror image of the design.