Google recaptcha is a tool which is free of cost available on google site.

First you should know what is captcha and why we used it in forms of websites.

Captcha is a picture of broken words mostly shown in the box and it’s placed in the form .

Due to large spam posting on websites, we used captcha to minimize the spams.

recaptcha tool of google, pakistani recaptcha

Captcha reduced spamming on websites, mostly on blogs, where commenting played a wide role of their popularity.

If you are using CMS wordpress, drupal ,joomla) for your website, then must install a plugin which give you inserting captcha in your forms.