JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
Yes, this is possible, you only need to click on the field and then click on the option "Input Mask" on the top toolbar.
You may also use this widget: http://widgets.jotform.com/widget/masked_input.
This guide will help you to add the widget to your form: http://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form.
If this is not what you are looking for, let us know, we will be glad to further assist you.