Questions
How do I make a QR code for my Wi-Fi?
Choose Wi-Fi, enter the network name and password and pick the security type. Phones that scan the code can join the network without typing the password.
Do these QR codes expire?
No. The content is stored in the code itself, not on a server, so the code keeps working as long as the link or details in it are valid.
Which error correction level should I choose?
Higher levels let a code scan even when part of it is dirty or covered, but they make it denser. M suits most uses; choose Q or H for codes that may get scratched or partly hidden.
Should I download PNG or SVG?
PNG is an image for screens and documents. SVG is a vector file that stays sharp at any size, so it is the better choice for print.