Wi-Fi QR Code Not Working? Find the Problem Step by Step
Work out whether the problem is scanning, wrong network details, router authentication, or internet access after joining.
Regenerating a QR code will not repair a router outage. A useful diagnosis begins by watching exactly what the phone does after the scan. Try the checks below with a second phone that has not already saved the network.
1. The camera does not detect the code
Open the phone’s Camera app or built-in code scanner and frame the entire square. Increase light, move the phone until the image is sharp, and avoid reflections on glossy signs. If the QR is printed very small or stretched in a design file, test the original downloaded image at normal size. A quiet white border and strong dark-on-light contrast help the camera separate the code from its surroundings. Google’s Pixel scanning guide recommends steady framing and good lighting; Apple documents scanning through Camera or Code Scanner.
2. The phone reads the code but rejects the network
- SSID: Compare the name in the generator with the router’s exact network name, including spaces and capitalization. Make sure the phone is within range of that SSID.
- Password: Use the current Wi-Fi password, not an admin login or a password saved before it was rotated.
- Security: Select the type that matches the network. Use the open-network option only when the network truly has no password.
- Hidden network: Enable the generator’s hidden setting only if the SSID is not broadcast.
Make a fresh code after correcting any field. If manual entry of the same credentials also fails, the problem is with the network details or router configuration. Google notes that hidden networks may require their name and security details to be entered explicitly in Android’s Wi-Fi settings.
3. The phone joins Wi-Fi but has no internet
Check whether another device on that SSID can browse. Look for a guest sign-in or captive portal prompt; some networks require a second authorization step. Then check the router’s internet status and guest network rules. The QR has already done its job if the phone joined the intended SSID. For managed networks, ask the administrator to inspect DHCP and access rules.
4. It works on one phone but not another
Test with both phones near the access point. Compare what each scanner displays, then try manual connection on the failing phone. Camera and Wi-Fi sharing menus vary by device and software version. If the network uses an enterprise sign-in rather than one shared password, a basic Wi-Fi QR code may not express the full login flow.
Before you reprint
Download a new code from the Wi-Fi QR generator, scan the saved file, then scan a proof at the final print size. Ask a second person to try it without giving them the password. If you recently rotated the guest password, remove every old card. For device-specific instructions, see the iPhone, Android, Google/Nest Wifi, and UniFi guides.