# What is a QR code?

Canonical HTML: https://scanmelon.com/en/what-is-a-qr-code

A QR code is a square pattern that a phone camera turns into a link, text, or other data in one scan. No extra app install is required on most smartphones.

## How a scan works

The corners are finder patterns. The camera uses them for orientation and scale, even if the code is slightly skewed. The remaining modules carry the payload plus error correction: part of the code may be damaged or covered (for example by a logo) and still decode.

## What fits inside

Web addresses are most common. You can also encode Wi-Fi details, a vCard, an email, or short text. More data means a denser grid. For print, a short stable URL is usually easier to scan than a long tracking link.

## Static or dynamic

A static code contains the final destination in the pattern. A dynamic QR code first points at an address you control, so you can change the real page later without reprinting.

On Scanmelon you design color, style, and an optional logo, then attach the destination. See https://scanmelon.com/create-qr-code.md or open https://scanmelon.com/.