Protect your site from spam and abuse.
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What is reCAPTCHA?

Easy to add, advanced security

reCAPTCHA is a free service that protects your site from spam and abuse. It uses and advanced risk analysis engine to distinguish humans from bots. With the new API, a significant number of your valid human users will pass the reCAPTCHA challenge without having to solve a CAPTCHA. reCAPTCHA comes in the form of a widget that you can easily add to your blog, forum, registration form, etc.

Powered by machine learning

Hundreds of millions of CAPTCHAs are solved by people every day. reCAPTCHA makes positive use of this human effort by channeling the time spent solving CAPTCHAs into digitizing text, annotating images, building machine learning datasets. This in turn helps preserve books, improve maps, and solve hard AI problems.