reCAPTCHA: Tough on Bots, Easy on Humans

Since the launch of the no CAPTCHA reCAPTCHA, a simple checkbox has helped identify humans from even the sneakiest bots, stopping billions of attacks on websites around the world. Now we're taking reCAPTCHA a step further and making it invisible. Sign up at https://g.co/recaptcha/invisible for future updates and set-up instructions.