Use a Wi-Fi QR code safely with a guest network, correct settings, and a plan for password changes.
A Wi-Fi QR code can reduce typing mistakes by packaging the network name, security type, and password in a format supported by many phones. It is convenient for guests, cafés, waiting rooms, rentals, and events. It also needs the same care as a written password.
Use a guest network
Create a separate guest network that cannot freely reach office computers, storage devices, cameras, or administration pages. Use current router security, a strong password, updated firmware, and client isolation where appropriate. A QR code does not add encryption beyond the network settings you select.
Treat the printed code as a credential
Anyone who sees or photographs the code may be able to connect. Place it only where intended visitors can access it. Do not post a private network code on a public social account. When the password changes, remove or replace old signs so visitors do not repeatedly try an obsolete credential.
Enter details exactly
Network names and passwords are case sensitive. Select the correct security type and indicate a hidden network only if it is actually hidden. Test on Android and iPhone because prompts can differ. Keep a staff contact or alternate joining method available for older devices.
Finally, avoid collecting more visitor information than needed. A basic guest Wi-Fi code can offer access without forcing an unrelated mailing-list signup. If a portal collects data, describe the purpose and retention in the privacy notice.