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23 Best WordPress Anti Spam Plugins

Updated on by in WordPress

Which is the best anti spam plugin for WordPress blog? WordPress is a very popular content management system that loads with various blogging security features, and that includes spam filtering. If you think that the built-in anti spam feature isn’t enough, and you’re looking for something more sophisticated. Below we’ve listed 23 anti spam plugins which can provide you extra features for effectively fighting spam on WordPress blog. We also recommend some useful captcha anti spam plugins for your consideration.


Any great ideas for fighting WordPress spam comments? Let us know in the comments box below.

Akismet checks your comments against the Akismet web service to see if they look like spam or not and lets you review the spam it catches under your blog’s “Comments” admin screen.

Bad Behavior
Bad Behavior complements other link spam solutions by acting as a gatekeeper, preventing spammers from ever delivering their junk, and in many cases, from ever reading your site in the first place. This keeps your site’s load down, makes your site logs cleaner, and can help prevent denial of service conditions caused by spammers.

WP-reCAPTCHA integrates reCAPTCHA anti-spam methods with WordPress including comment, registration, and email spam protection. Instead of randomly generating useless characters which users grow tired of continuously typing in, risking the possibility that spammers will eventually write sophisticated spam bots which use OCR libraries to read the characters, reCAPTCHA uses a different approach.

WP Hashcash is an antispam plugin that eradicates comment spam on WordPress blogs. It works because your visitors must use obfuscated javascript to submit a proof-of-work that indicates they opened your website in a web browser, not a robot. If the javascript check fails, WP Hashcash now gives you three options; it can either put the comment into moderation (default), put the comment in the akismet queue, or delete it.

NoSpamNX automatically adds additional form fields to your comment form, invisible to human users. If a spambot fills these fields blindly (which most of all spambots do), the comment will not be saved. You can decide if you want to block these spambots or mark them as spam. Furthermore, you can put common spam-phrases on a local Blacklist or (if you have multiple Blogs) on a global Blacklist.

This plugin provides a CAPTCHA for your comment system to prevent unwanted spams. It prevents automated spams by bots and most important naughty peoples. It’s simple and yet secure.

Spam Free WordPress
Spam Free WordPress is a comment spam blocking plugin that blocks the automated spam. Manual spam is blocked with an IP address blocklist.

AVH First Defense Against Spam
This plugin gives you the ability to block spammers before any content is served by identifying them at the Project Honey Pot, a local blacklist or the local IP cache. Visitors trying to post a comment are checked at Stop Forum Spam is not used to check before content is served due to the amount of requests, which overloads their infrastructure.

Peter’s Custom Anti-Spam
This plugin stops a lot of spambots from polluting your site by making visitors identify a random word displayed as an image before commenting and optionally before registering. You can customize the pool of words to display.

Growmap Anti Spambot Plugin
This plugin will add a client side generated checkbox to your comment form asking users to confirm that they are not a spammer. It is a lot less trouble to click a box than it is to enter a captcha and because the box is genereated via client side javascript that bots cannot see, it should stop almost all the automated spam bots.

Defensio Anti-Spam
Defensio is an advanced spam filtering web service that learns and adapts to your behaviors and those of your users. In addition to simple spam filtering, they also provide malicious content detection, profanity filtering, URL categorization, script detection and much more.

Super CAPTCHA Security Suite
This plugin stops spam and brute-force attacks with dynamic CAPTCHA images and intelligent automagic IP.

Spammer Blocker
Spammer Blocker blocks all visitors who posted a comment that was later marked as spam or prevents them from posting comments. For example if your Akismet catches a spam comment, its author will be muted/blocked until you delete the spammer’s IP address from your database.

Simple Trackback Validation
Simple Trackback Validation Plugin performs a simple but very effective test on all incoming trackbacks in order to stop trackback spam.

Better WordPress reCAPTCHA (support Akismet)
This plugin utilizes the popular anti-spam library, reCAPTCHA, to help your blog stay clear of spams (especially when you integrate it with Akismet). Unlike the current WP-reCAPTCHA plugin, this one has a different approach and allows you to customize how the captcha looks using CSS.

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.

Spam Stopper
The whole idea to this plugin is to keep spammer robots from posting on your blog, reducing the space taken by spam messages in the database, and preventing your blog from being a spam magnet.

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.

JSSpamBock is an effective way to reduce comment spam without your commenters even knowing. Users without JavaScript can prove their identity by simply entering a given number. In browsers without JavaScript, the user is simply asked to enter a number to prove they are human.

This plugin adds numerical addition CAPTCHA anti-spam methods to WordPress on the comment form. In order to post comments, users will have to type in the phrase shown on the addition. This can help prevent spam from automated bots.

BuddyPress reCAPTCHA
This plugin utilizes reCAPTCHA to help your blog stay clear of spam-registrations.

bcSpamBlock is a simple way to protect your blog from comment spam. It ensures that the client is a human by using a small bit of javascript on the comments page. Users with Javascript enabled will never notice any difference. For users without Javascript, they will have to copy/paste a short code into a textbox to confirm.

Picatcha integrates image-identification CAPTCHA – anti-spam solution with WordPress including comment and registration.


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