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.

  • Profile Image

    If I link a form with Constant Contact to capture email addresses, will it detect duplicates or will it potentially create duplicates?

    Asked by HHFM on February 07, 2017 at 11:05 AM
  • Profile Image
    JotForm Support

    Answered by david on February 07, 2017 at 12:17 PM

    Constant Contact will try to create a new contact each time the form is submitted unless  you choose the settings to allow users to choose whether or not they are added. 

    What you can do, is only allow for one submission per used based on their IP/Cookies or a unique questions:


    Set the unique question to an email field and it will only allow for one submission per email address.