documentation/content/en/admin/optional/captcha.md

---
title: Captcha
description: Mitigating automated signup bots
menu:
  docs:
    weight: 30
    parent: admin-optional
---

As of Mastodon 4.2, using CAPTCHA technology is supported to help mitigate against bots signing up for new accounts.
With CAPTCHA enabled, new registrations will be required to complete a challenge response as part of the e-mail verification process.

![](/assets/captcha/user-view.png)

{{< hint style="danger" >}}
For some people, the use of a central CAPTCHA service may be a security and privacy concern.
In addition, CAPTCHA can make the registration process significantly less accessible to some people.
{{</ hint >}}

Currently, hCaptcha is the only available provider supported by Mastodon.
Other providers may be added in the future.

## hCaptcha

- Create a free hCaptcha account at [hcaptcha.com](https://www.hcaptcha.com)
- After completing registration, use the hCaptcha dashboard to add a new site with your Mastodon server domain and obtain a Site Key
- From the Account Settings menu in hCaptcha, obtain your Secret Key
- Add the values to your Mastodon environment configuration as `HCAPTCHA_SITE_KEY` and `HCAPTCHA_SECRET_KEY`
- Restart the Mastodon services running on your server
- From the Mastodon web interface navigate to **Administration**  > **Server settings** > **Registrations** and check the box labled "Require new users to solve a CAPTCHA to confirm their account"

![](/assets/captcha/admin-view.png)