How QR Codes Actually Work

A QR code stores text (most often a URL) as a pattern of black and white squares following a published, open standard. A scanner reads the pattern, corrects for perspective and rotation using the three large squares in the corners, and decodes it back into the original text exactly, the same input always producing the same code.

QR codes include built in error correction, redundant data woven into the code specifically so it can still be read even if part of it is smudged, torn or covered, for example by a logo placed in the middle. Higher error correction levels sacrifice some data capacity in exchange for tolerating more damage, which is why some QR codes look visibly denser than others encoding a similarly short piece of text.

A QR code is not inherently more or less trustworthy than a typed link; it just hides the destination from a casual glance until it is scanned. Anyone who scans a QR code goes exactly where it points, with no built in verification of where that actually is, which is exactly why QR codes pasted over existing ones in public places have become a real phishing tactic.

QR codes earn their keep anywhere typing a URL by hand would be impractical: printed materials, physical signage, presentation slides, or handing someone a link without needing them to type anything at all. They are a convenience for a known, trusted destination, not a safety feature.

QR Code Generator turns any URL or block of text into a scannable code entirely in your browser, available to download as a PNG. Since sharing a QR code is functionally identical to sharing the link or text it contains, treat it with the same care you would the original.