If, within 14 days, you feel our product isn’t the right fit, simply contact us and we’ll issue a 100% full refund. No questions asked. No hassle.
Frequently asked questions
Can’t find the answer you’re looking for? Reach out to our customer support.
What problem does Duplicate Killer PRO solve?
Duplicate Killer prevents repeated form submissions and accidental duplicate WooCommerce orders that can corrupt lead data, CRM systems, payment records and analytics.
Which plugins are supported?
Currently, Duplicate Killer PRO supports:
Contact Form 7; Forminator; WPForms Lite; Breakdance Page Builder Forms; Elementor Forms Formidable Forms Ninja Forms More integrations are planned in future updates.
Does Duplicate Killer work with WooCommerce?
Yes. The FREE version protects WooCommerce Classic Checkout. The PRO version adds Checkout Blocks support, advanced fingerprint controls and duplicate order analytics.
How does duplicate validation work?
When someone submits a form, the plugin checks the selected unique fields (for example, Email or Phone) against previous entries stored in your database. If the same value already exists, the submission is blocked, and a custom error message is shown.
Can I prevent duplicates only for the same user?
Yes. You can enable “Unique entries per user” — this uses cookies to identify the same visitor and stops them from submitting identical values again, without affecting other users.
Does the plugin store form submissions?
Yes. Duplicate Killer PRO stores all submissions in your WordPress database so you can view, filter, and manage entries directly from the admin dashboard. No external services or APIs are used — your data stays on your site.
Can I request a new feature or integration?
Yes! We love user feedback. If there’s a form plugin or feature you’d like supported, send us a message — we prioritize updates based on community demand.
Do you offer a free trial?
We don’t offer a time-limited trial version — instead, we provide a Free plan that includes the essential features of Duplicate Killer PRO.
If you later upgrade to PRO, you’re covered by our 14-day money-back guarantee, no questions asked.
What happens when my license expires?
After your license expires, the plugin will continue to work as it was. You’ll no longer receive updates or support, and access to some advanced settings may be limited.
Support & Troubleshooting – Duplicate Killer PRO
Please check these quick steps — most issues can be solved instantly:
Contains information related to marketing campaigns of the user. These are shared with Google AdWords / Google Ads when the Google Ads and Google Analytics accounts are linked together.
90 days
__utma
ID used to identify users and sessions
2 years after last activity
__utmt
Used to monitor number of Google Analytics server requests
10 minutes
__utmb
Used to distinguish new sessions and visits. This cookie is set when the GA.js javascript library is loaded and there is no existing __utmb cookie. The cookie is updated every time data is sent to the Google Analytics server.
30 minutes after last activity
__utmc
Used only with old Urchin versions of Google Analytics and not with GA.js. Was used to distinguish between new sessions and visits at the end of a session.
End of session (browser)
__utmz
Contains information about the traffic source or campaign that directed user to the website. The cookie is set when the GA.js javascript is loaded and updated when data is sent to the Google Anaytics server
6 months after last activity
__utmv
Contains custom information set by the web developer via the _setCustomVar method in Google Analytics. This cookie is updated every time new data is sent to the Google Analytics server.
2 years after last activity
__utmx
Used to determine whether a user is included in an A / B or Multivariate test.
18 months
_ga
ID used to identify users
2 years
_gali
Used by Google Analytics to determine which links on a page are being clicked
30 seconds
_ga_
ID used to identify users
2 years
_gid
ID used to identify users for 24 hours after last activity
24 hours
_gat
Used to monitor number of Google Analytics server requests when using Google Tag Manager
