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Field Validation on 123FormBuilder

Field Validation allows you to accept only the data that meets your required format. Here are the predefined validation types available for our Specific fields within our form builder:

  • Number/Formula/Price: numeric
  • Email: email
  • Website: URL (web page/must start with http://)
  • Date: mm/dd/yyyy
  • Time: hh/mm
  • Phone: numeric (3-3-4)

For the Short text field, we provide more complex field validations, which you can customize according to your needs. The validation types available are:

  • alpha – only letters
  • numeric – only digits
  • alpha numeric – letters and digits
  • alpha space – letters and white spaces
  • alpha numeric space – letters, digits, and white spaces
  • full name – e.g. John Doe – the value must contain at least one space character
  • regular expression – add a regex code to define your own validation code
Field validation

Pro tip: If you have a Number field and you also need to accept decimals, use the numeric plus validation.


  1. Hi
    Will it be possible to cross check an email provided by an user through the form against a list of already stored emails. If the user email is found in the stored list, then only the user is taken to subsequent fields.

    1. Hello! Your scenario would indeed be possible by using our CSV connector feature, however, we will need more information about this request. Please reach out to us at to discuss more details. Looking forward to hearing from you!

  2. Disregard my question cause I don’t understand half of what you said. Cookies??? Apparently everyone assumes we all know iPhone stuff. Well I’m sorry I do not know much about my phone but no big deal.

  3. Hi! Could you help me with this request?
    I want to make a register form for an even, and I have tickets with a code, I want users to access to the form only if they have a correct code, each code is unique and can be used once.
    I propose this solution:
    Make a validation on a text box, I want to introduce an alphanumeric value an check if the data it’s on a google doc, or in a list, or somewhere.
    Or check if the data satisfy some rule like the sum of the ASCII Code of each value is equal to something.
    Or if you have other solution, please let me know.

    1. Hello, Hector! We have a feature to password protect your Event Registration Form. See our documentation at
      Create a password for your form and send it to your guests, so that they can access it.

      Unfortunately, we do not have a feature to use unique codes, but you could create a JavaScript code which will verify the codes introduced by your form visitors. To add a custom JavaScript code follow our documentation here

      For any other assistance, contact our Support Team at
      They will get back to you as soon as possible.

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Frequently Asked Questions

Here is a list of the most frequently asked questions. For more FAQs, please browse through the FAQs page.

Is this service free?
Yes, we offer a free form builder service. Just sign up to the Basic plan and you are all set. This plan is forever free, but you are limited with a few features only, such as 5 forms per account, 100 submissions per month and you have to keep the backlink to 123FormBuilder on your forms. Check out our features matrix for more information.
How many forms can I create?
It depends on the service plan you are on. Higher service plans enable more features, including more web forms for your account. If you need more forms, go to the My Account section of your account and click the upgrade button. To create an unlimited number of forms, either upgrade to the Platinum service plan or higher. Consult our features matrix for more information.
How can I publish my forms?
You can publish your forms in many ways, by using their direct URL or HTML link, embedding them with a JavaScript code, Inline HTML or iFrame, using the Facebook app or the WordPress plugin, using popups, the Blogger code snippet and many more. Once you have created and customized your form, go to the Publish section to complete your work. Read more in our documentation.
How do I change my form design?
You can change the design of your form in the Themes section, which is located in your form settings. We offer a set of more than 30 predefined form themes for your forms, but you can also create your own from scratch. You can customize the submit button, the logo and more. To apply your own stylesheets, all forms come with a custom CSS editor.

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