A QR code is only as useful as its decoded payload

A QR generator converts text or a URL into a scannable image. Before printing, choose a stable destination and tell readers what scanning will do. Keep enough size, contrast, and quiet margin for the expected distance and surface.

Scan the exported image with a second device or app. Compare the decoded payload exactly, including protocol, spelling, and query parameters. Test a physical proof if the code will be printed, because screen previews do not capture ink or lighting. A QR code does not certify a destination as trustworthy; people should still inspect unfamiliar links.