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 optional character on required Input Mask

    Asked by bimboo on September 19, 2016 at 04:10 PM


    Here in Brazil, We have two phone pattern:

    (XX) XXXXX-XXXX and


    The third digit is opcional. How a can make a mask for opcional digit?

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    JotForm Support

    Answered by Mike on September 19, 2016 at 08:24 PM

    Thank you for contacting us.

    It is possible to add an optional character with the square brackets.


    The form user will be able to use a 'space' or '-' to skip that character.

    If you need any further assistance, please let us know.