WordPress, as a Content Management System, comes loaded with basic features to tackle spam. Spam is the most irritating factor for any web based company or for blog owners, because spam can damage the overall quality of your site to a great extent and sometime it can destroy your site completely.
In this post we have collected some of the best free anti spam WordPress plugins which you can use in your site and protect it against spam to a great extent. Don’t forget to give your most welcomed feedback to improve quality of our blog. You may be interested in the following posts: Free WordPress Education Themes, WordPress Free Sidebars Widgets and WordPress Pricing Table Plugins.
1. WP-SpamShield Anti-Spam
An extremely robust and user friendly WordPress anti-spam plugin that stops blog comment spam cold, including trackback and pingback spam.
2. Slider CAPTCHA
Using Slider CAPTCHA, you can replace or add a CAPTCHA to your WordPress forms. By default, Slider CAPTCHA will add a CAPTCHA to your templates’ comment form.
3. ExtraWatch FREE
Analyze your visitor behavior, optimize website and then increase conversions and sales. Once called the “Swiss Army Knife” for every WordPress website.
4. Anti-spam by CleanTalk
Anti-spam CleanTalk that would provide maximum protection from spam and you can provide for your visitors a simple and convenient form of comments/registrations without annoying CAPTCHAs and puzzles.
5. Spam Master
Spam Master was born out of need to protect our website against constant malicious spam registrations and comments that affect the majority of wordpress websites.
6. Centrora Security
Centrora Security is a new plugin that modified from OSE Firewall Security. A WordPress Firewall Security to protect your WordPress Sites from attacks and hacking.
7. Comments by Vicomi
Vicomi comments is a free comment platform with a new cool, stylish graphic interface that replaces your default WordPress comment system.
8. Simple Trackback Validation
Simple Trackback Validation Plugin performs a simple but very effective test on all incoming trackbacks in order to stop trackback spam. Now with topsy.com blocker.
9. User Registration Aide
WordPress User Registration Aide Force & Add New User Fields on Registration Form, as the title implies, allows you to require more fields when a new user registers.
The most advanced protection against sploggers and spam users registration, is fully WordPress,WordPress MU ,BuddyPress and bbPress 2.0 compatible.
11. 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.
12. Spam Destroyer
Stops automated spam while remaining as unobtrusive as possible to regular commenter. The Spam Destroyer plugin is intended to be effortless to use, simply install and enjoy a spam free website.
13. Mailgun Email Validator
Kick spam with a highly advanced email validation in comment forms, user registration and contact forms using Mailgun’s Email validation service.
14. Conditional CAPTCHA
Asks commenters to complete a simple CAPTCHA if they don’t have a previously approved comment, or if Akismet thinks their comment is spam.
Anti-spam plugin blocks spam in comments automatically, invisibly for users and for admins.
16. NO CAPTCHA Anti-Spam
NO CAPTCHA Anti-Spam. Keypic checks your blogs comments against the comprehensive Keypic Web Service to see if they look like spam or not.
Upon activation, SpamLord eliminates the potential for automated spam comments, as well as trackback spam.