Editorial
Guides
Technical background, editorially reviewed.
QR code types: what a scan actually contains
URL, Wi-Fi, vCard, payment, GS1 — how to judge a payload before you click.
Read the guideBarcode types: EAN, UPC, Code 128 and Data Matrix
Which symbology belongs where, and why the check digit matters.
Read the guideQR code will not scan: seven common causes
Contrast, size, quiet zone, glare — a diagnostic checklist.
Read the guide