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.
If I understood your question correctly, input mask is available on text boxes. When you click any text box, you will see Input Mask on the top toolbar.
Use @ symbol to mask letters, # for numbers and * for both.
It is also available on Phone Number tool under Quick Tools.
There is also a widget which is Masked Input. Please, check the guide below:
Hope this will help. Let us know if you need further assistance.