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 was not able to replicate the issue. Our Form Builder has an auto-save feature. Whenever you preview your form or close your form, it will auto-save your form. If you want you can find your recent changes to your form in the revision history, here's a guide: https://www.jotform.com/help/294-How-to-view-form-revision-history
Hope that helps. If the issue persists, contact us again.