# yii\captcha

> 4 classes of the yii\captcha namespace.

[API reference](/docs/api/index.md) › [yii](/docs/api/yii/index.md) › captcha

## Classes

| Class | Summary |
| --- | --- |
| [`Captcha`](/docs/api/yii/captcha/captcha/index.md) | Captcha renders a CAPTCHA image and an input field that takes user-entered verification code. |
| [`CaptchaAction`](/docs/api/yii/captcha/captchaaction/index.md) | CaptchaAction renders a CAPTCHA image. |
| [`CaptchaAsset`](/docs/api/yii/captcha/captchaasset/index.md) | This asset bundle provides the javascript files needed for the [`Captcha`](/docs/api/yii/captcha/captcha/index.md) widget. |
| [`CaptchaValidator`](/docs/api/yii/captcha/captchavalidator/index.md) | CaptchaValidator validates that the attribute value is the same as the verification code displayed in the CAPTCHA. |