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 correctly, you do not want the Thank You page to show up after the user submits the form? If that is so, then you can simply redirect the form to your own custom page after submission to prevent the user from seeing the Thank You page. Here's a guide on Redirecting Users to a Different Page. Please let us know if you need further assistance.