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.
JotForms are mobile responsive by default; however, you can control how the form looks with custom CSS code, please take a look on this guide about mobile responsive forms: How-to-make-mobile-friendly-forms-on-JotForm
Also, there is a widget that you can add to your form and it will also help you to make your form mobile responsive, here is the link: https://widgets.jotform.com/widget/mobile_responsive
This guide will help you to add the widget to your form: How-to-Add-a-Widget-to-your-Form
However, if you need some help with some specific elements in the form, please let us know, if the form has been embedded in a webpage, please also share it with us, we will be glad to help you.