Overview · Cloudflare Turnstile docs

Verify visitors are human with a CAPTCHA-free, privacy-preserving alternative.

Cloudflare Turnstile - Easy CAPTCHA Alternative

Verify Visitors Without CAPTCHA Cloudflare Turnstile confirms web visitors are real and blocks unwanted bots without slowing down web experiences for real users. It's a simple snippet of free code that eliminates CAPTCHAs. With Turnstile, you can deliver better experiences and strengthen privacy for all users.

Get started · Cloudflare Turnstile docs

Set up Turnstile to verify visitors without a traditional CAPTCHA.

Cloudflare Turnstile | CAPTCHA Replacement Solution

Cloudflare Turnstile is a simple and free CAPTCHA replacement solution that delivers better experiences and greater security for your users.

How does Cloudflare's Turnstile work? : r/webdev - Reddit

Turnstile also includes machine learning models that detect common features of end visitors who were able to pass a challenge before. The computational hardness of those initial challenges may vary by visitor, but is targeted to run fast.

Cloudflare Turnstile: How It Works and Why Checks Fail

Understand Cloudflare Turnstile, its three widget modes and token validation. Distinguish a Turnstile failure from a challenge page or a blocked request.

Cloudflare Turnstile Explained: How Modern Bot Protection Works

Learn what Cloudflare Turnstile is, how it works, how it compares with reCAPTCHA and hCaptcha, and why modern websites use it for low-friction bot protection.

What Is Cloudflare Turnstile? How Verification Works

Learn how Cloudflare Turnstile uses browser challenges and server-side token validation, how widgets differ, and what developers must verify.

Cloudflare Turnstile Complete Implementation Guide 2025

Cloudflare Turnstile represents a fundamental reimagining of how we verify users online. Rather than presenting visual puzzles or distorted text, Turnstile runs silent JavaScript challenges in the visitor's browser, collecting behavioral signals and environmental data that distinguish humans from automated bots. The system employs multiple verification techniques simultaneously: proof-of-work ...

Agents can now set up your website's security with Turnstile Spin

Misconfiguring Turnstile by skipping backend validation leaves sites exposed to bots. Turnstile Spin fixes incomplete setups by using your preferred AI coding agent to wire up server-side verification.