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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You can achieve by redirect the JotForm back to itself by entering its URL in the URL box of Custom URL section of the Thank You Page Wizard:
Just to clarify, if your JotForm's URL is http://form.jotform.com/form/0123456789, you would enter that as the URL inside of Thank You page redirect URL.
Hope this will help.