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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Yes it is possible, while you are creating your form, click on what the text you want to resize, go to Form style/font size. in addintion to this you can always check our widgets that might help you, here is one fits your need.
I am not sure if I have understood your question correctly.
Do you want to increase the font size of your text area field? Please inject the following custom css in your form to increase the input font size of text area field:
The following guide should help you in injecting the custom css code: http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes
Hope this helps.
Do get back to us if you have any questions.