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 want to add your webpage to your form, you can achieve that with Iframe Embed widget. Inside of this guide you can find how to add widget to your form:
However if you want to embed your form to your webpage with iFrame code, please check this guide to see how to get iFrame code of your form:
Hope this will help. Let us know if you need further assistance.