Best form security plugins for WordPress
The most popular form security plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. Contact Form 7 Spam Killer leads with 3K+ active installs, ahead of Kitgenix CAPTCHA for Cloudflare Turnstile (800+) and ZigZag Image Captcha for Contact Form 7 (60+). All 9 plugins tagged “form security” are below, with figures from WordPress.org that update every day.
Installs aren’t everything: a recent release, a “Tested up to” that matches the current WordPress, and support threads that get resolved show a plugin is looked after. Open any plugin for its downloads, rank history and alternatives.
Research this niche or see all plugins.
Top 9 form security plugins
- 1.
Contact Form 7 Spam KillerThe most installed form security plugin, with 3K+ active installs. Only 4 reviews so far, last updated 1 year ago. Tested only up to WordPress 6.8.12.
- 2.
Kitgenix CAPTCHA for Cloudflare Turnstile800+ active installs. Rated 5.0 from 6 reviews, updated 1 week ago.
- 3.
ZigZag Image Captcha for Contact Form 760+ active installs. Only 1 review so far, updated 1 month ago.
- 4.
IP Limit Add-On for Gravity Forms50+ active installs. No reviews yet, last updated 1 year ago. Tested only up to WordPress 6.8.12.
- 5.
BWG CF Turnstile20+ active installs. No reviews yet, last updated 1 year ago. Tested only up to WordPress 6.8.12.
- 6.
Valid Email Verification for Contact Form 710+ active installs. No reviews yet, updated 1 week ago.
- 7.
Mathematical Captcha ApplierFewer than 10 active installs. No reviews yet, updated 2 months ago.
- 8.
EzerWeb Forms and Comments Anti-Spam GuardFewer than 10 active installs. No reviews yet, updated 1 week ago.
- 9.
Volance DetectionFewer than 10 active installs. No reviews yet, updated 3 weeks ago.
All 9 plugins tagged “form security”
Contact Form 7 Spam Killer
Up in the last 7 days:9#3,647by WP-EXPERTS.IN1 year ago
"Contact Form 7 Spam Killer" is a advance spam blocker that will help to prevent unwanted spam for your Contact Form 7 plugin.
- Installs
- 3K+
- Rating
- 5.0(4)
- Downloads
- 21/day
Kitgenix CAPTCHA for Cloudflare Turnstile
Up in the last 7 days:71#7,608by Kitgenix9 days ago
Add Cloudflare Turnstile to WordPress, WooCommerce and popular forms with server-side verification and anti-spam controls.
- Installs
- 800+
- Rating
- 5.0(6)
- Downloads
- 45/day
ZigZag Image Captcha for Contact Form 7
Up in the last 7 days:58#19,855by Suraj Kumar Sinha1 month ago
Adds a secure, flexible image captcha field to Contact Form 7 with zig-zag protection, timer, refresh, AJAX validation, and accessibility support.
- Installs
- 60+
- Rating
- 5.0(1)
- Downloads
- 0/day
IP Limit Add-On for Gravity Forms
Down in the last 7 days:133#20,193by bipinbheda541 year ago
This Add-one is useful for spam prevention, you can set a limit to the Gravity Forms submissions by visitor's IP address over a custom time range.
- Installs
- 50+
- Rating
- –
- Downloads
- 0/day
BWG CF Turnstile
Down in the last 7 days:349#26,504by timh1 year ago
Add Cloudflare Turnstile protection to your Gravity Forms to prevent spam and bot submissions.
- Installs
- 20+
- Rating
- –
- Downloads
- 0/day
Valid Email Verification for Contact Form 7
Up in the last 7 days:2,885#42,505by Sabirul Islam7 days ago
Adds duplicate email blocking and verification to Contact Form 7 to improve form security and reduce spam.
- Installs
- 10+
- Rating
- –
- Downloads
- 0/day
Mathematical Captcha Applier
#59,553by samiur66882 months ago
Apply a simple mathematical captcha to specific buttons by providing their CSS class or ID to prevent spamming.
- Installs
- <10
- Rating
- –
- Downloads
- 0/day
EzerWeb Forms and Comments Anti-Spam Guard
#60,883by Eric Kouassi11 days ago
Modular dual-layer anti-spam protection for WordPress forms and comments with custom TLD and email filtering.
- Installs
- <10
- Rating
- –
- Downloads
- 11/day
Volance Detection
Down in the last 7 days:16,020#70,105by Volance26 days ago
Tells humans, AI agents and bots apart on your logins, registrations, comments, checkout and contact forms, and any page or REST endpoint you choose, …
- Installs
- <10
- Rating
- –
- Downloads
- 0/day