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.
It should apply to all forms. If you use the iFrame embed code to embed your form, it will ensure there is nothing in your page preventing the mobile CSS from being used:
You can also try adding our mobile responsive widget to your form: