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 am not sure if I have understood your question correctly.
Do you mean to say that you want to paste HTML content in text box? Unfortunately it is not possible to paste HTML in textbox but you can achieve your requirement by adding Text Area with "Rich Text" editor mode. Please check the screenshot below:
Alternatively you can also use following widgets as well:
Hope this helps.
Do get back to us if you meant to ask something else.