> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.cal.id/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Enable Captcha on Booking Page

**Enable captcha on booking page** protects your calendar from spam bots and automated booking scripts.

| Why use it

* **Bot mitigation:** stops bots flooding your schedule with fakes.
* **Protect public links:** essential for discovery calls and public pages.
* **Prevent slot-snatching:** blocks scripts that grab every slot.
* **Clean data:** keeps junk leads out of your dashboard and CRM.

| Set it up

1. Open **Event Types** and click the event.
2. Open the **Advanced** tab.
3. Toggle **Enable captcha on booking page** **ON**.

![](https://storage.crisp.chat/users/helpdesk/website/-/6/f/1/c/6f1c2c7b8034d000/image_i27tbi.png =1173x615)

4. Choose a **captcha strength**:
* **Low:** challenges only highly suspicious traffic.
* **Medium:** the standard balance of security and experience.
* **High:** strict — more likely to show visual challenges to everyone.

![](https://storage.crisp.chat/users/helpdesk/website/-/6/f/1/c/6f1c2c7b8034d000/image_8o7bhb.png =1173x615)

5. Click **Save**.

| How it works

For most visitors the check runs silently. If behavior looks bot-like, they get a visual or audio challenge before confirming. **High** strength is more sensitive — more secure, but may add friction for real users.

> **Note:** pairing captcha with **email verification** makes your page very secure but adds steps. For internal or 1-on-1 links, **Medium** or **Low** keeps booking smooth.