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WordPress as we all know is the biggest Blogging Platform. It has got many features like Good Security, SEO Friendly etc. Being a Popular & Best Platform, WordPress is targeted by Spammers. Although WordPress has good Security and Default Akismet Plugin installed which fights to make your blog spam free. But it is not so effective. Spammers uses various Black Hat Tools to Spam the WordPress Blog. They uses spambots for Posting Large Number of Comments at once on 1000's of Blogs.
Few Days Back, Kulwant Wrote on “How to Protect your Blog with Spam Registrations“. He Introduced a plugin which adds captcha to protect it from Spam Registrations. Its seen that Captcha Plugins effectively reduces the Spam in the Blog. You can use this Captcha in the Comment Box or in the Contact Form. So whenever the Readers will post comments, they have to fill the Captcha. Spambots being a Program and not a human cant fill the Captcha correctly. So this reduces the Spam in the WordPress Blog. It is always recommended to use Captcha Plugins along with Antispam Plugin to effectively fight and reduce the spam in the Blog.
6 Best Captcha Plugins to Reduce Spam
1. Wp Recaptcha
eCAPTCHA is probably the most popular and widely accepted CAPTCHA systems by both end-users and site-owners. It is used by such sites prominent sites as Facebook, Twitter, to the Average Joe's little blog out there on the corner of the Internet.
It is accessible by everyone. If the user has trouble reading the CAPTCHA challenge, he or she has the option of requesting a new one. If this does not help, there is also an audio challenge which users may use.
2. SI Captcha
Adds CAPTCHA anti-spam methods to WordPress forms for comments, registration, lost password, login, or all. In order to post comments or register, users will have to type in the code shown on the image. This prevents spam from automated bots. Adds security. Works great with Akismet. Also is fully WP, WPMU, and BuddyPress compatible.
3. Secure Captcha
Secure CAPTCHA allows to distinguish between form submission made by human and script (robot, bot, program etc.). It gives you ability to reject all form submissions made in automatic way. Secure CAPTCHA was designed to be both hard to break with a script and easy to solve by the humans.
4. Sweet Captcha
Sweet Captcha is a free Captcha service putting your users and your website at first priority. Instead of asking the user to input difficult and boring text, Sweet Captcha offers a cute and interactive friendly user experience. The Sweet Captcha consists of a question the user needs to answer by dragging the correct answer.
5. Key Captcha
KeyCAPTCHA is an effective monetizing tool of your website. In contrast to other systems, KeyCAPTCHA solidly protects your website against spam as well provides you with an income acquisition instrument. The more popular your website is, the much more income you will get.
6. Captcha WordPress Plugin
Captcha plugin allows you to protect your website from spam using math logic which can be used for login, registration, resetting password, comments forms. Added Russian, German and Dutch languages.