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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If I understand you correctly, you want to increase the space between the form fields vertically, is that correct?
You can actually increase the line space using the Form Designer.
In the Form Designer, go to the Design tab and then you'll see the Line Layout section. There is a slider where you can increase or decrease the line space.
If this is not what you need then please let us know. Also, please provide more details about your issue. Thank you.