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.
Are you trying to change the font size of your submission pdf / reports?
Actually you cannot customize the pdf in JotForm. You should look at some pdf editor which will help you change the font size in the pdf.
You should check this pdf editor: http://www.pdfescape.com/