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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Here's a guide how to remove the Powered by Jotform:
1. Go to this link: https://www.jotform.com/myaccount/settings
2. After that, uncheck the Show "Powered by JotForm" on my forms. Here's a screenshot:
Keep in mind that you can't remove it, if you're a free user subscription.
Hope that helps.