6 min read · Try QR Code Generator
Common developer uses
Staging URLs on phones, deep links for mobile QA, Wi‑Fi join strings (`WIFI:S:...`), and vCard contact cards for conference booths. PNG download is enough for slides and printed stickers.
Size and error correction
Larger modules scan from farther away. Higher error correction survives partial damage on posters but increases density—pick medium correction for screen display.
Never encode secrets
QR images are not encrypted. Anyone who scans sees the payload. Use short-lived tokens in URLs and rotate if a QR leaks.
Test on real devices
Verify iOS and Android camera apps read your URL before printing hundreds of codes for an event.
This article is part of the DevToolsHub learning guides—original writing meant to complement our free tools, not replace official documentation from vendors or standards bodies.