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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I understand that you want to make your JotForm responsive to view correctly on mobile screens. This can be achieved by enabling Responsive option from the Preferences tab and enabling Make this form responsive from Form Designer.
Please refer to the following guide with step by step instructions with graphical illustrations.
Hope this information helps. Let us know if you need any further assistance. We will be happy to help.