10 Amazing Free Comment Spam WordPress Plugins

Comment spam and registration spam remain a large problem for WordPress users. It is not uncommon for some WordPress websites to receive hundreds or even thousands of comments every week. WordPress has a large community of developers who have been fighting the good fight against comment spam with free plugins that you can easily install on your WordPress blog.

However, not all WordPress comment spam comes from bots – a good portion of it actually comes from people who are paid to deliver these meaningless comments throughout the web. Here are the top some of the best free comment spam WordPress plugins to stop comment spam. While compiling this list, it’s always a possibility that I missed some other great resources. Feel free to share it with us.

You might also want to take a look at our previous selections:

1. WP Spam Fighter

This plugins prevents comment spam without requiring you to moderate all comments or your users to use user-unfriendly captchas or answer stupid arithmetic questions. Normal users actually do read your post, which takes time. So someone sending a comment only a few seconds after having loaded the post has to be a spammer.

WP Spam Fighter

2. WP-SpamShield Anti-Spam

An extremely powerful and user friendly WordPress anti-spam plugin that stops blog spam cold, including comment spam, trackback and pingback spam, contact form spam, and registration spam. Comment spam has been a huge problem for bloggers since the inception of blogs, and it just doesn’t seem to go away.

WP-SpamShield Anti-Spam

3. Anti-spam

Anti-spam plugin blocks spam in comments automatically, invisibly for users and for admins. No captcha, because spam is not users’ problem. No moderation queues, because spam is not administrators’ problem. No options, because it is great to forget about spam completely.


4. WordPress Simple Firewall

The WordPress Simple Firewall is the ultimate professional WordPress Security System. It prevents brute force attacks on your login and also any attempted automatic bot logins. It creates true WordPress User Sessions so you can monitor user activity and restrict username sharing.

WordPress Simple Firewall

5. Greg’s Comment Length Limiter

This plugin provides a configurable limit on the length of comments left in the comment form, with a character countdown displayed for the user and dynamically updated with each keypress. Fixed potential XSS vulnerability which could affect administrators who are logged in using an old browser and who visit a maliciously crafted URL on their own site.

Greg's Comment Length Limiter

6. Advanced Invisible Anti-Spam

Anti-Spam solutions that require your users to fill out captcha’s are frustrating for actual humans, and not that great at stopping bots. This solution works automatically without any user configuration, and puts no additional burden on your users. After activation this plugin will go to work stopping: comment spam, spam bot registration, and bbPress spam.

Advanced Invisible Anti-Spam

7. WordPress Zero Spam

WordPress Zero Spam blocks registration spam and spam in comments automatically without any additional config or setup. Just install, activate, and enjoy a spam-free site. Blocks spam registrations & comments with the use of JavaScript, Contact Form 7 support if installed and activated, Gravity Form support if installed and activated, BuddyPress support if installed and activated.

WordPress Zero Spam

8. WP Anti Spam

WP Anti Spam can anti automated spambots, it can also anti spams by”comment”,”ip”,”name”,”email”,”url”. It is a good assistant to help you anti artificial spams. You can set the ‘Minimum number of words’ and ‘Maximum number of words’ to limit the comment words.

WP Anti Spam

9. Anti Spam Protection without CAPTCHA powered by Keypic

Keypic is the alternative to CAPTCHA. Keypic stands for safe Internet and accessibility. And without CAPTCHA. Your users will appreciate it very much. Providing more reliable anti spam protection and making your website more accessible Keypic delivers cloud anti spam protection technology and you do not need to use CAPTCHA plugins anymore.

Anti Spam Protection without CAPTCHA powered by Keypic

10. Stop Spam Comments

Simple, lightweight yet effective spam comment blocker for WordPress. Lightweight: no additional database queries, it doesn’t add script files or other assets in your theme. This means your website performance will not be affected and your server will thank you. Dead simple: no setup required, just activate it and enjoy your spam-free website.

Stop Spam Comments