Validation styles are available for the following form controls and components: <input> and <textarea> with .form-control, <select> with .form-select, and .form-check inputs.

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
Please select at least one option
Please choose a file

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 select a valid state.
Please provide a valid zip.
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
Please choose a file

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 select 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 or JavaScript? No problem—use browser defaults. Try submitting the form below to see built-in feedback styles, which vary by browser and OS. While CSS can't style them, you can customize the text with JavaScript.

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