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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It's possible to do with JotForm, you just need to add our Preview Before Answer button and it's done, the user will be able to preview the data before to hit the submit button, refer to the image below in order to add the widget to your form :
You will find further info about it and a sample form on this link :
Hope that helps.
Let us know if you need further assistance, we will be glad to assist you.