It's not just URLs
A QR code is a container for text. What kind of string you put inside decides how a phone behaves when it scans.
Wi-Fi login — connect instantly without reading out the password at a cafe or shop.
WIFI:T:WPA;S:MyCafe;P:coffee1234;;
Contact (vCard) — scanning saves the name, phone, and email straight to the address book.
BEGIN:VCARD
N:Hong Gildong
TEL:010-1234-5678
EMAIL:hong@example.com
END:VCARD
Plain URLs, dialing (tel:), and texting (sms:) work too.
Making it scan reliably
- Keep the quiet zone (margin). Text or borders crowding the code hurt recognition.
- For print, make it large enough — at least ~1.5cm on a business card, bigger on a poster.
- When recoloring, keep strong contrast: a dark code on a light background is safest.
Generation happens in your browser. For building Wi-Fi codes, see the Wi-Fi QR code generator guide.