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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In saving forms, you can always edit it anytime. But, if I'm misunderstanding your concern such as if you are referring to the matter of making a form submission, you can likewise fill up forms and get back to it later on. This user guide explains how to enable the autoFill feature:
And this other guide allows you to do something similar but using session on URL parameters: