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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Mobile responsive widget is added in form to make your form mobile responsive. Once the widget is added, it will automatically adjust the width of form fields based on the screen size.
Alternatively, you can also enable the responsive form property of your form's preferences. Please check the screenshot below:
Hope this answers your query.
Do get back to us if you have any questions.