You can also try these other puzzle generators:
Dradarech Jigsaw Puzzle Generator
and of course there is an excellent Inkscape plugin that is my personal favorite because instead of cutting the individual pieces it generates horizontal and vertical cut lines which makes for a much cleaner finished puzzle.
Neon22 / inkscape-jigsaw puzzle generator
Also if you follow our resident puzzle master @jbmanning5 instructions to mask, cut horizontal, change mask, cut vertical and cut outline to make for faster weeding of the puzzle.
JBManning5 How to weed a puzzle like a boss
Have fun!