What Captcha to use for forms?

Posted: Tue Dec 14, 2010 10:22 pm Post subject: What Captcha to use for forms?

Hi,

I am would like to add a Captcha to few forms, where users can submit data to stop spambots signing up.

What Captcha would you recommend?

NetHosted Staff Joined: 22 Mar 2004 Posts: 7017

Hi,

reCaptcha is popular: http://www.google.com/recaptcha

Thanks,

Andrew

Posted: Thu Mar 17, 2011 3:44 pm Post subject:

Another more user-friendly option which can help block bots is to just include a blank text field in the form with a label saying "leave this field blank".

You can use CSS/JS to hide the field from the majority of users (and people with text-only browsers will read the label and ignore it), but a spam bot will just see the field via the code and probably put a URL in it.

Then on the server side you just check if the field has a value in it and if so consider it spam.

Of course, this doesn't help against a human spammer or a specifically targeted spam bot, but it's a nice quick "good enough" solution when you might not want a distorted image captcha for other reasons.

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