Simply drag & drop a .puz file here, and I'll make you a crossword. No files will be sent to the server, this is entirely done using your modern Web browser. Note that this only currently works with the following HTML5-compatible browsers:
Note 2021-09-04: The original web app used to live at Derek Slager's site, but at some point it stopped working. I (Leo Stein) grabbed a static archived version from the Internet Archive and am mirroring it here for personal convenience. All credit goes to Derek Slager for originally developing and hosting the page.