QR code glossary

Definitions

Static QR code

A QR code whose content (a link, text, Wi-Fi details or a contact card) is stored directly in the pattern. It never expires and cannot be changed after printing.

Dynamic QR code

A QR code that stores a short link instead of the final content. The owner can change where the link leads at any time and see scan analytics, without reprinting the code.

Short link

The brief web address inside a dynamic QR code, such as scansational.com/s/abc123. It forwards visitors to the current destination.

Destination

The web page, file or hosted page a dynamic QR code currently sends people to.

Hosted page

A mobile page created and stored by the QR service, such as a menu, PDF, contact card or list of links, so you don't need your own website.

Scan

One time someone opens a dynamic QR code's link, usually by pointing a phone camera at the code.

Unique visitor

An estimate of how many different devices scanned a code, so repeat scans by the same person are counted once.

Bot filtering

Excluding automated traffic, such as link checkers and crawlers, from scan counts so the numbers reflect real people.

Scheduled change

A destination change set to happen automatically at a future date and time, such as switching a menu for a new season.

Error correction

Redundant data built into every QR code so it still scans when partly damaged or covered, for example by a logo. Higher levels tolerate more damage but make the pattern denser.

Quiet zone

The empty margin around a QR code. Scanners need it to find the code, so artwork should not crowd the edges.

Module

One of the small squares that make up a QR code's pattern. Styled QR codes change the shape of modules, for example to dots or rounded squares.

Finder pattern (eyes)

The three large squares in the corners of a QR code that let scanners locate and orient it. Designers often restyle these as "eyes".

vCard

A standard format for contact details. A vCard QR code lets someone save a name, phone number and email to their phone in one tap.

Scannability check

An automatic test that reads a designed QR code with a decoder to confirm it will still scan after colors, logos and styles are applied.

SVG

A vector image format that scales to any size without losing sharpness. Best for professional printing and large signage.

PNG

A standard image format for websites, documents and everyday printing. Export at a high resolution for print.