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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To show the full length of the form in your website, you can try changing the height of the iframe. You can use the iFrame code below where I set the height to 4341px.
<iframe id="JotFormIFrame" onload="window.parent.scrollTo(0,0)" allowtransparency="true" src="https://form.jotform.com/53157488427970" frameborder="0" style="width: 100%; height: 4341px; border: none;" scrolling="auto">
The form should now show up completely in your website.
If you need further assistance, please let us know.