QR Code 만료 및 접근 제어
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Setting expiration rules: date-based, scan-count, password-protected, and IP-restricted access for dynamic QR codes.
QR Code Expiration and Access Control
Dynamic QR codes can enforce access rules: time limits, scan count caps, passwords, and geographic restrictions.
Time-Based Expiration
Set a date after which the QR code stops working:
- Start date: QR code becomes active on a specific date (useful for embargoed content)
- End date: QR code expires and shows an "expired" message
- Time window: Active only during specific hours (e.g., business hours)
Use cases: event tickets, limited-time promotions, coupon QR codes.
Scan Count Limits
Restrict the total number of scans:
- Single-use: One scan and the code is deactivated (event tickets, unique coupons)
- Limited use: N scans allowed (small group access)
- Unique device limit: One scan per device, unlimited total (fair access)
Password Protection
Require a password after scanning before revealing the content:
- The redirect page prompts for a password
- Correct password reveals the destination
- Useful for confidential documents or exclusive content
Geographic Restrictions
Limit scanning to specific regions:
- Whitelist: Only scans from allowed countries/cities proceed
- Blacklist: Block scans from specific regions
- Based on IP geolocation (same limitations as geotargeting)
Implementation
Most dynamic QR platforms offer some access control features. For custom implementations:
- Time-based: Server-side date check before redirect
- Scan count: Database counter incremented on each scan
- Password: Intermediate page with form submission
- Geographic: IP geolocation lookup before redirect
Expired QR Code UX
When a QR code has expired or been deactivated, the user should see a clear, friendly message — not a 404 error:
- "This offer has expired. Visit our website for current promotions."
- Include a link to the main website or a relevant page
- Display brand identity so the user knows it was a legitimate code
Key Takeaways
- Dynamic QR codes support time, count, password, and geographic restrictions
- Single-use codes are effective for tickets and unique coupons
- Expired codes should display a friendly message, not a 404 error
- Geographic restrictions use IP geolocation with inherent accuracy limits
- Access control features vary by platform — evaluate before selecting