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.

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    How to set a minimum characters within a text box field?

    Asked by formazioneasllecce on June 25, 2013 at 01:20 AM

    I have to check that placing an alphanumeric field is always 16 characters. how can I do?

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    JotForm Support

    Answered by Welvin on June 25, 2013 at 02:44 AM


    Do you mean to prevent the users to entry below/above 16 characters on a form field? If yes, unfortunately, we only have a function to limit the maximum numbers in a field. There is currently no way to limit a minimum characters, but we can provide you a workaround such as using your form source codes then adding custom Javascript to the source for such function.

    Finish your form and let us know the URL so we can proceed and help for this workaround.