QR codes made without a server
Many QR generators send what you type to their server and some add tracking redirects. This one draws the code in your browser, so Wi-Fi passwords and private links stay on your device.
Wi-Fi QR codes
Fill in the network name and password, print the code and stick it by the door. Guests point their phone camera at it to join without typing anything.
Questions
PNG or SVG?
PNG works everywhere. SVG stays sharp at any size, which is better for printing.
What is error correction?
Higher levels let the code be read even when part of it is damaged or covered, at the cost of a denser code.