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 add electronic signature using E-signature widget.
1. In the Form Builder, select More Fields tab. Type E-Signature in the search box.
2. Drag E-Signature widget. Go to properties and change required field to Yes.
You can also use Smooth Signature widget.
Hope that helps. Let us know if you need any further assistance. Thank you.