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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JotForm Support Manager
You can setup a Custom URL Thank You page, simply use the direct link of the form or the link to your webpage where the form might be embedded.
On your form's edit mode, click on Thank You button at the toolbar
Select Custom URL
Then paste the form's direct link or the link of the webpage where the form is:
Thank you very much!