SlideShare a Scribd company logo
reCAPTCHA 
Tough on bots 
Easy on humans
Roughly 200 million captchas 
Are typed everyday
On an average 10s of human 
Time is wasted per captcha 
In this way approximately 
2000 million seconds 
get wasted everyday
LUIS VON AHN
• reCAPTCHA is a free service to protect your website from spam 
and abuse. reCAPTCHA uses an advanced risk analysis engine 
and adaptive CAPTCHAs to keep automated software from 
engaging in abusive activities on your site. 
• It does this while letting your valid users pass through with 
ease. 
• A CAPTCHA is a Completely Automated Public Turing test to tell 
Computers and Human Apart. 
.
OCR 
Optical 
Character 
Recognition
For the visually impaired, reCAPTCHA provides an audio CAPTCHA 
option
MASSIVE SCALE ONLINE 
COLLABORATION

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Recaptcha and the idea behind its development

  • 1. reCAPTCHA Tough on bots Easy on humans
  • 2. Roughly 200 million captchas Are typed everyday
  • 3. On an average 10s of human Time is wasted per captcha In this way approximately 2000 million seconds get wasted everyday
  • 5. • reCAPTCHA is a free service to protect your website from spam and abuse. reCAPTCHA uses an advanced risk analysis engine and adaptive CAPTCHAs to keep automated software from engaging in abusive activities on your site. • It does this while letting your valid users pass through with ease. • A CAPTCHA is a Completely Automated Public Turing test to tell Computers and Human Apart. .
  • 6.
  • 7. OCR Optical Character Recognition
  • 8.
  • 9. For the visually impaired, reCAPTCHA provides an audio CAPTCHA option
  • 10.
  • 11.
  • 12.
  • 13. MASSIVE SCALE ONLINE COLLABORATION