What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
It is possible to limit the user to submit only once. You can use the Unique Question or Unique Submission feature.
Unique Question - This feature prevents multiple submission that has the same answer. For example, email address or phone number. The next user cannot enter the same phone number or same address. Here's a guide: https://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question.
Unique Submissions - This feature will block multiple submissions from one browser or same IP address. Here's a guide: https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form.
If you have any questions, let us know. Thank you.