Validation Provide valuable, actionable feedback to your users with HTML5 form validation. Choose from the browser default validation feedback, or implement custom messages with our built-in classes and starter JavaScript.

How it works

Validation styles are available for the following form controls and components: <input> and <textarea> with .form-control (including up to one .form-control in input groups), <select> with .form-select or .custom-select, .form-check, .custom-checkbox and .custom-radio, .custom-file

Learn more about forms on bootstrap's official documentation

Invalid form styles

Please enter a message in the textarea.
Please enter a message in the textarea.
Example invalid feedback text
More example invalid feedback text
Example invalid custom select feedback
Example invalid custom file feedback

Custom Styles

For custom Bootstrap form validation messages, you’ll need to add the novalidate boolean attribute to your <form>. This disables the browser default feedback tooltips, but still provides access to the form validation APIs in JavaScript. Try to submit the form below; our JavaScript will intercept the submit button and relay feedback to you. When attempting to submit, you’ll see the :invalid and :valid styles applied to your form controls.

Custom feedback styles apply custom colors, borders, focus styles, and background icons to better communicate feedback. Background icons for <select>s are only available with .custom-select, and not .form-control.

Looks good!
Looks good!
@
Please choose a username.
Please provide a valid city.
Please provide a valid state.
Please provide a valid zip.
Please enter a message in the textarea.
Please select at least one
You must agree before submitting.

Server side

We recommend using client-side validation, but in case you require server-side validation, you can indicate invalid and valid form fields with .is-invalid and .is-valid. Note that .invalid-feedback is also supported with these classes
Looks good!
Looks good!
@
Please choose a username.
Please provide a valid city.
Please provide a valid state.
Please provide a valid zip.
You must agree before submitting.

Valid form styles

Please enter a message in the textarea.
Please enter a message in the textarea.
Example valid feedback text
More example valid feedback text
Example valid custom select feedback
Example valid custom file feedback

Tooltip Styles

If your form layout allows it, you can swap the .{valid|invalid}-feedback classes for .{valid|invalid}-tooltip classes to display validation feedback in a styled tooltip. Be sure to have a parent with position: relative on it for tooltip positioning. In the example below, our column classes have this already, but your project may require an alternative setup.

Looks good!
Looks good!
@
Please choose a username.
Please provide a valid city.
Please provide a valid state.
Please provide a valid zip.
Please enter a message in the textarea.
Please select at least one
You must agree before submitting.

Browser defaults

Not interested in custom validation feedback messages or writing JavaScript to change form behaviors? All good, you can use the browser defaults. Try submitting the form below. Depending on your browser and OS, you’ll see a slightly different style of feedback.

While these feedback styles cannot be styled with CSS, you can still customize the feedback text through JavaScript.

@