1. Password Is in Plain Text
The payload holds the SSID and key as readable text. Anyone who scans can view it and can also photograph the code. Generate WiFi codes securely with our [WiFi QR code generator](/wifi-qr-code-generator) and verify with a [QR scanner](/qr-scanner).
2. Reduce Exposure
* Use a separate guest network isolated from internal devices and cash registers.
* Rotate the key periodically and reprint using our [printed QR tester](/printed-qr-tester) verification.
* Use client isolation so guests cannot see each other.
* Do not use the same key for staff networks.
3. Evil Twin Risk
An attacker can broadcast a network with the same name. Using WPA2 or WPA3 with a strong key and checking the network list helps, though a QR alone does not prove authenticity. Follow our [QR safety checker](/qr-safety-checker) guidelines for positioning codes to prevent tampering.
4. Public Venues
Place the code where staff can see it so overlays are noticed. Use our [QR placement guide](/qr-placement-guide) for tamper-evident positioning, size appropriately with our [QR size calculator](/qr-size-calculator), and generate trackable variants with our [UTM builder](/utm-builder) if linking to a landing page instead of direct WiFi credentials.
Putting this into practice
Start with the smallest real test you can run. Generate the code, print it at the exact size you plan to use, and scan it with two different phones in the lighting where it will live. Check that the destination page loads quickly on a mobile connection and that the call to action next to the code tells people what they will get. If anything feels slow or unclear, fix it before you print a full batch, because reprints cost more than a short test. Keep a note of the size, material, and placement that worked so the next batch starts from a proven setup.
Common mistakes to avoid
The most common mistakes are easy to avoid once you know them. Long payloads make modules tiny, low contrast makes edges hard to read, and text placed too close to the border eats the quiet zone the scanner needs. Covering a corner finder pattern with a logo or a sticker breaks detection entirely, and a code placed behind glare or on a curved surface fails even when the print is perfect. Review each of these points on a proof copy, and treat any failure as a reason to adjust the design rather than a reason to blame the scanner.
Quick checklist
- Keep the payload as short as practical so modules stay large.
- Keep dark modules on a light background with strong contrast.
- Leave a clear quiet zone on all four sides of the symbol.
- Test the printed code at the real viewing distance and lighting.
- Confirm the destination page loads fast on a phone.
- Recheck the code after any change to the link, design, or placement.
