The problem: Several years ago the small college where I worked stopped using fillable PDFs because of the large amount of spam submissions they were attracting. We went to using PHP forms and that's fine for most people. However, I get calls every once in a while from departments who can't understand why output of web forms can't look EXACTLY like the printed versions/PDFs. The easiest way to silence their complaints would be to start using fillable PDFs again, but we don't want to do that if we start getting inundated with spam submissions again. The question: Does anyone know a way to prevent spam in fillable PDFs? Captchas, hidden fields ... whatever is available.