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 am not exactly sure if I understood your question correctly. Do you want to allow your users to save form and continue later. There are two way to achieve this:
Auto fill method is based on browser local storage. It is saving the form data on users browser, so user can open the form later and he/she will see the past data. Note - user will need to use same browser to access data.
The Session method is saving the data on our servers. With this method you will need to use two forms, one for session generation and second as primary. Then users will be able to access their sessions from any locations.
However please note that you will not be able to see submission on your account, until your users submit the form. There is no partial submissions.
This options are available to all plans, free and paid. Actually all our features are available for all plans.
You can also let your users to update their form submissions at a later date.
If I did not understood you question correctly, please explain in more details what you are trying to achieve.
Hope this will help. Let us know if you need further assistance.