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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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Can you please give us more details about what you mean on "combine fields"? In what way you're trying to combine fields? Is it fields from different forms? Or is it a fields that you'd like to combine on the same line? Or do you want to create a guest book type form as per your post? We'd appreciate if you could clarify this to us.