by NIA 5 (3 reviews)

Duplicate Killer – Prevent Duplicate Form Submissions

Prevent duplicate form submissions by email, phone or text. Supports Contact Form 7, Elementor Forms, Forminator, WPForms Lite and more.

Duplicate Killer ranks #5,989 among WordPress.org plugins with 1,000+ active installations, is #263 of 2,802 in the Contact Forms category, a 5/5 rating from 3 reviews, and was last updated Oct 26, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Compatible with WP 7.1.4

v1.7.7 Current Version v1.7.7

Updated 6 days ago Last Update on 26 Oct, 2026

Refreshed 2 days ago Last Refreshed on

#263 of 2,802 in Contact Forms Top 10% by installs Downloads -19.4% this week Actively maintained

View on WordPress.org

Rank

#5,989

— No change

Active Installs

1K+

-34.3%

KW Avg Position

83.8

0.3 worse

Downloads

34.1K

+8 today

Support Resolved

— No change

Rating

100%

Review 5 out of 5

5 (3 reviews)

Next Milestone 2K

Total Progress 53.4%

1K+ 2K+

969

Ranks to Climb

Growth Needed

8,000,000

Active Installs

Pro

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Rank Changes

Current #5,989

Change

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Active Installs Growth

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Active Installs 0,000,000+

Growth +0.0%

Peak 0,000,000

Downloads Growth

Downloads

Growth

Peak

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Reviews & Ratings

5.0

3 reviews

Overall 100%

3 (100%)

0 (0%)

Security History

Source: WPVulnerability

No known vulnerabilities on record for Duplicate Killer. Checked 3 months ago.

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Plugin Details

Version: 1.7.7
Last Updated: Oct 26, 2026
Requires WP: 5.3+
Tested Up To: 7.1.4
PHP Version: 5.6.20 or higher
Author: NIA

Support & Rating

Rating: ★ ★ ★ ★ ★ 5
Reviews: 3
Support Threads: 0
Resolved: 0%

Keywords

contact form 7 duplicate-orders elementor forms forminator woocommerce

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TL;DR

AI summary of the plugin's readme

This plugin is for WordPress site owners using forms (Elementor, Contact Form 7, Formidable, WPForms, Forminator, Ninja Forms, Breakdance) or WooCommerce Classic Checkout who want to stop duplicate submissions. It blocks repeated form entries by validating unique email, phone, or text fields, and prevents accidental duplicate WooCommerce orders within a time window, all without CAPTCHA.

Blocks duplicate form submissions
Unique email/phone/text validation
No CAPTCHA required
WooCommerce duplicate order protection
Cross-Form Duplicate Protection (PRO)
IP-based duplicate protection
Stores Contact Form 7 uploaded files
CSV export for audits (PRO)

Frequently Asked Questions

Common questions about Duplicate Killer – Prevent Duplicate Form Submissions

Duplicate Killer focuses on preventing duplicate form submissions and entries. It works alongside spam or CAPTCHA plugins and does not replace them.

Duplicate Killer checks submitted values against saved entries. Performance depends on your hosting, settings and submission history. Modern Popup Mode also uses frontend assets when enabled.

Duplicate Killer helps reduce duplicate leads and contact requests by checking selected email, phone or text fields. Set a protection period and explain blocked submissions with your own message.

Yes. The FREE version protects WooCommerce Classic Checkout from accidental duplicate submissions within a 60-second window.

Duplicate Killer compares selected field values with entries it has previously saved. A matching value can block the submission according to your protection settings and duration. Earlier entries stored only by your form plugin are not automatically imported. For WooCommerce, a unique order fingerprint is generated from billing email, cart items, order total and currency.

Cookie-based protection uses the visitor's browser. It does not verify a person's identity. Clearing cookies or using another browser can change how the visitor is recognized.

Classic Message uses your form plugin's error display. Modern Popup Mode shows a custom popup for Duplicate Killer duplicate-field messages. It does not redesign your form fields.

Yes. Duplicate Killer supports forms created with the Elementor Pro Form widget. Duplicate Killer PRO also includes Group Mode for Elementor forms that share the same Form Name.

No. Duplicate Killer checks repeated values without requiring a CAPTCHA challenge. CAPTCHA and anti-spam tools address different problems and may still be useful alongside duplicate protection. Test the combined setup with your form plugin and extensions.

Yes. Enable IP-based protection for your protected form and set a duration in days, hours and minutes. This limits form submissions from that IP address; it does not block access to your whole WordPress website.