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.
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For that I would suggest taking a look at the following widget: Fixed Format
It will allow you to predefine your format and to accept it as such on your forms.
You can see here how to add the widget to your form: How to Add a Widget to your Form, but do of course let us know if there is anything that we can assist you with and we would be happy to do so :)