JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
If with cancel you mean to delete your account then your forms will not work, but if you're only looking to upgrade your account, create your forms, use them and then downgrade to free again your forms will keep working, but the limits for the free account will be applied, the form views, upload space, submissions limit and forms that you can have active.
You can also check the limits per account on our pricing page: https://www.jotform.com/pricing