The term CAPTCHA (for Completely Automated Public Turing Test To Tell Computers and Humans Apart) was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas Hopper and John Langford of …

This CAPTCHA (GIMPY-R, c. 2005) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient. A CAPTCHA (/ ˈkæp.tʃə / KAP-chə) …

Solve CAPTCHAs to prove your humanity once and for all in this puzzle game. Are you not a robot? We'll find out soon enough.

reCAPTCHA v3 helps you detect abusive traffic on your website without user interaction. Instead of showing a CAPTCHA challenge, reCAPTCHA v3 returns a score so you can choose the most …

What is CAPTCHA, and what is it for? Learn about how CAPTCHA tests work, how Google reCAPTCHA works, and how these tests help stop bad bots.

Test your humanity by solving the world's hardest CAPTCHA and win a prize.

reCAPTCHA is a free service from Google that helps protect websites from spam and abuse. A “CAPTCHA” is a turing test to tell human and bots apart. It is easy for humans to solve, but hard for …

Jun 8, 2026 · Here’s how the fake CAPTCHA requests happen…and how you could wind up installing malware on your own device. You get an unexpected CAPTCHA request while browsing a website. …

May 1, 2026 · Security experts reveal how easy it is to get fooled by this scam and what to do if you think you've been targeted.

Feb 28, 2026 · Want to know what a CAPTCHA is & how it works? Learn about the origin of CAPTCHAs, what they do & why they can't stop advanced bots.