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I have created a sign up form for a job finding website:

sign in

Should I add a captcha to separate humans from robots when registering for the site? What are its benefits and what effects could this have on the user experience?

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    As this is a User Experience site, then the answer is a definitive NO. Has any user ever said "Oh cool, I've got to solve this little puzzle before I can sign in!" – JonW Jun 23 '15 at 11:28
  • ok in that case why some sites put captchas in their sign up form ? is is for security reasons ? – hazhir farahmand Jun 23 '15 at 12:00
  • @jonW Oh, i got this. its to prevent spams, but is that new captcha which makes users only to check that box user friendly? – hazhir farahmand Jun 23 '15 at 12:21
  • Any form of CAPTCHA is less user-friendly than no CAPTCHA at all. What takes less time to do for you - typing your name in a box and hitting OK, or typing your name in a box, ticking a box and hitting OK? – JonW Jun 23 '15 at 12:35
  • The way I discuss this topic with clients: For every hurdle you put in the way of the user's task, you will lose some number of potential users/customers. How many are you willing to lose? – Ken Mohnkern Jun 23 '15 at 12:49
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First, you should find out why CAPTCHAs are placed in websites. CAPTCHA is a way to filter the requests from suspicious visitors (robot). So the reason is about "security" itself.

And then about UX concern, "Does it provide a good experience?" The answer is NO. It's very frustrating when I visit a register page at first time, I have to solve the CAPTCHA. Sometimes users are difficult to solve the text, or user mistakenly types the text. It can decreases your "conversion" for your next step.

So, combining the UX and security concern, let follow how Google & Facebook did. They're very user friendly. When login/register, there are no CAPTCHA displayed. But when you're trying to submit the form brutally or you failed to login using password, it shows the CAPTCHA. So the CAPTCHA is showed when an unusual activity detected. It's your security time. The conclusion what they did is: User-friendly: ✓ YES, Secure: ✓ YES

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No, you should not use CAPTCHA.

You should focus on technical ways of solving your problems rather than shifting the technical burden onto your users. As a simple example, you are asking for an email address, so you could validate the email address (which you should do anyway) as a substitute for CAPTCHA.

Someone could still write a script to generate many user accounts, but there is no incentive to do this if they don't have an easy way to spam people with user accounts.

  • exactly - even just asking for an email address and password can be a barrier to entry. make it easy for people to get in and then verify that they are a legitimate user later with a simple verification email. – DaveAlger Jun 23 '15 at 14:50

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