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.
We apologize for the inconvenience. I cloned one of your most recent forms and I tried to create a Fillable PDF. I was also able to recreate your issue as it was stuck on "working" for more than 5 minutes.
The issue seems to be related to the form itself as I was able to create a Fillable PDF for the other forms. Do note that there are still limitations in the Fillable PDF depending on the length of the form being created as PDF. Nonetheless, I have escalated your issue to our back-end team for further investigation. For now, you can check out this article for more information about fillable pdf: Fillable PDF - Everything you need to know about JotForm Fillable PDF Creator