Preventing Duplicate Responses by Enabling Re-Entry Lock

Overview

Stop the same person from submitting twice by locking re-entry after they finish the survey — cleaner data without a login.

Step-by-step

1. Open the Routing channel — in the Share tab, click Routing.

2. Enable Lock re-entry after finishing — tick the option. Once a respondent completes, returning to the link won't let them start again.

3. Combine with a password or personal links for stronger control if the survey is high-stakes.

Tips

Tip: Re-entry lock is the right default for open links you post publicly — it removes the easiest form of duplicate submission with zero friction for legitimate respondents.

Note: The lock is device/browser-based, so it's a strong deterrent, not an identity guarantee — someone determined can clear their browser or switch devices. For guaranteed one-response-per-person, use personal links.

Related articles

• Password-Protecting Your Survey to Control Who Can Respond — gate entry
• Generating Personal Trackable Links in Bulk for Individual Contacts — one link per person
• Understanding the Fraud Signals That Cause a Respondent to Be Flagged — deeper quality control