by NIA 5 (3 reviews)

Duplicate Killer – Prevent Duplicate Form Submissions

Block duplicate form submissions by validating unique email, phone and text fields without CAPTCHA.

Duplicate Killer ranks #6,099 among WordPress.org plugins with 1,000+ active installations, is #269 of 2,586 in the Contact Forms category, a 5/5 rating from 3 reviews, and was last updated Sep 8, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Compatible with WP 7.1

v1.7.0 Current Version v1.7.0

Updated 1 week ago Last Update on 08 Sep, 2026

Refreshed 8 hours ago Last Refreshed on

#269 of 2,586 in Contact Forms Top 10% by installs Downloads -69.8% this week Actively maintained

View on WordPress.org

Rank

#6,099

— No change

Active Installs

1K+

-36.3%

KW Avg Position

37.3

— No change

Downloads

29.5K

+2 today

Support Resolved

— No change

Rating

100%

Review 5 out of 5

5 (3 reviews)

Next Milestone 2K

Total Progress 50.9%

1K+ 2K+

964

Ranks to Climb

Growth Needed

8,000,000

Active Installs

Pro

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Rank Changes

Current #6,099

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 1 month ago.

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Plugin Details

Version: 1.7.0
Last Updated: Sep 08, 2026
Requires WP: 5.3+
Tested Up To: 7.1
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 submissions duplicate-orders elementor forms 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.

No. Duplicate Killer performs lightweight database checks only on form submission and has no impact on frontend performance.

Duplicate Killer prevents duplicate emails and repeated form submissions, helping you keep your leads and contact data clean.

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

For WooCommerce, a unique order fingerprint is generated from billing email, cart items, order total and currency.

Yes. In the PRO version, you can enable “Unique entries per user”, allowing multiple users to submit the same value while blocking repeat submissions from the same user.

No. Duplicate Killer works in the background and does not change your form appearance.

Yes. Duplicate Killer fully supports Elementor Forms.

Yes. Duplicate Killer works alongside spam and CAPTCHA plugins and focuses only on preventing duplicate form submissions.