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.
Unfortunately it is not possible to add script codes to the default Thank You page, so you cannot put adsense code there. A possible workaround would be to create your own custom Thank You page where you can put the AdSense code. Then simply redirect the form to that custom Thank You page after submission. Please follow this guide on Redirecting Users to a Different Page.