When fixed QR codes are a good fit
Fixed QR codes work well for stable content such as shop Wi-Fi, contact cards, phone numbers, email addresses or a URL that is unlikely to change.
The content is encoded directly inside the QR image, so you can download PNG or SVG files and keep them for printing.
Before printing
The content of a fixed QR cannot be changed after creation. Test it on multiple devices before printing at scale.
Keep the QR color dark, the background light and avoid covering finder corners with a logo.