What is reCAPTCHA?Digitizing Books One Word at a Time reCAPTCHA is a free CAPTCHA service that helps to digitize books. A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from "bots," or automated programs usually written to genera
