What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
You can add a watermark to your form by using the watermark image as your background. You can check the video on this link to setup your background image - http://www.jotform.com/form-designer/tuts/episode10/.
When you say print in pdf, do you mean fillable PDF or Print Button on your form? If you mean fillable PDF, unfortunately, you cannot add watermark on fillable PDF. Background image are not displayed on fillable PDF. If you mean Print Button, setting the background image of your form to your watermark will work.
Do get back to us if you encounter any problem in setting this up.