Complete Reference

QR Code Glossary

Every technical term, standard, and marketing concept related to QR codes — explained simply and accurately by TheQrify's editorial team.

43 terms • Last reviewed June 2026 • Sources: ISO/IEC 18004, Denso Wave, Google Webmaster Guidelines

QQR Code: Short for Quick Response code — a two-dimensional matrix barcode invented by Denso Wave in 1994 that stores data readable by a camera or dedicated scanner.
MModule: The individual black or white square pixel unit that makes up a QR code grid. A Version 1 QR code contains a 21×21 grid of modules.
FFinder Pattern: The three large square patterns located in three corners of every QR code. They allow scanners to detect position and orientation instantly regardless of angle.
AAlignment Pattern: Smaller square patterns embedded within larger QR codes (Version 2 and above) that help camera software correct for distortion and perspective skew.
TTiming Pattern: Alternating black-and-white modules that run between the finder patterns, defining the coordinate grid used to read the code's data accurately.
QQuiet Zone: The mandatory white border of at least four modules surrounding every QR code. Removing or cropping the quiet zone causes scan failures.
RReed-Solomon Error Correction: A mathematical algorithm that adds redundant data to the QR code, allowing it to be decoded even if up to 30% of the code surface is damaged or obscured.
EError Correction Level: The degree of damage a QR code can sustain while remaining scannable. Four levels exist: L (7%), M (15%), Q (25%), and H (30%).
SStatic QR Code: A QR code that permanently encodes the destination data (e.g., a URL) into the pattern itself. The data cannot be changed once printed.
DDynamic QR Code: A QR code that encodes a short redirect URL. The actual destination can be updated at any time without reprinting the code. Also supports scan analytics.
VVersion: The size specification of a QR code, ranging from Version 1 (21×21 modules) to Version 40 (177×177 modules). Higher versions store more data but produce denser codes.
DData Capacity: The maximum amount of data a QR code can store, which varies by version and error correction level. A Version 40-H code holds up to 1,273 alphanumeric characters.
EEncoding Mode: The data type format used within a QR code: Numeric (digits only), Alphanumeric (digits + letters), Byte (binary/UTF-8), or Kanji (Japanese characters).
SSVG Export: Scalable Vector Graphics format — the preferred format for printing QR codes as it uses mathematical paths rather than pixels, ensuring perfect clarity at any size.
PPNG Export: Portable Network Graphics — a pixel-based raster format suitable for digital use such as websites, email, and social media posts, but not ideal for large-format printing.
PPDF Export: Portable Document Format — a print-ready format that embeds the QR code as a vector image, ideal for sharing with print shops or including in marketing documents.
BBranded QR Code: A QR code that incorporates a custom logo, brand colours, or unique shapes to align with a company's visual identity, increasing trust and scan rates by up to 34%.
LLogo QR Code: A QR code with a company or product logo placed in the centre module area. Possible because error correction (Level H) can recover that obscured section of the code.
CColour QR Code: A QR code using non-black/non-white colours. Requires maintaining sufficient contrast ratio (minimum 3:1) between foreground and background for reliable scanning.
SScan Rate: The percentage of people who scan a QR code relative to the total who see it. Branded codes consistently outperform generic ones in measured campaign data.
SShort URL: A compressed URL used inside dynamic QR codes as the redirect address. Keeps the QR code's data density low, resulting in simpler, easier-to-scan patterns.
RRedirect URL: The final destination a dynamic QR code sends the scanner to after passing through the short URL redirect server. Can be updated without changing the printed code.
UUTM Parameters: URL query strings appended to QR code destinations (e.g., ?utm_source=poster) to track campaign performance inside Google Analytics or any analytics platform.
SScan Analytics: Real-time data collected when a dynamic QR code is scanned, including total scans, unique devices, geographic location, operating system, and time of scan.
VvCard QR Code: A QR code encoding a vCard (Virtual Contact File) containing name, phone, email, address, and company details — enabling instant digital business card sharing.
WWiFi QR Code: A QR code encoding a WiFi network's SSID, password, and encryption type in a standardised format (WIFI:S:...) so scanners can join the network automatically.
MMecard: An alternative to vCard for encoding contact information within QR codes, originally developed by NTT Docomo. Simpler format but less widely supported than vCard.
IISO/IEC 18004: The international standard published by the International Organization for Standardization that defines the QR code specification, ensuring cross-device compatibility.
DDenso Wave: The Japanese company (a subsidiary of Toyota Group) that invented the QR code in 1994 and holds the patent, which it chose not to enforce to allow free global adoption.
QQuishing: QR Code Phishing — a cyberattack where malicious QR codes are used to redirect victims to fake websites designed to steal credentials or install malware.
MMicro QR Code: A compact variant of the QR standard with a single finder pattern, designed for applications with very limited space such as PCB components and small product labels.
FFrame QR Code: A QR code design where a customisable visual 'canvas' area is placed in the centre, allowing for richer image or text embedding beyond a simple logo.
HHigh Density QR: A QR code operating at higher version numbers or using tighter module spacing to store large amounts of data such as full vCards or event information in a single code.
BBatch QR Generation: The automated process of generating multiple unique QR codes simultaneously — used for product serialisation, ticketing, or large-scale direct mail campaigns.
LLanding Page QR Code: A QR code that links directly to a dedicated marketing landing page, optimised for a specific call-to-action such as signing up, downloading, or buying.
AApp Store QR Code: A QR code that links to a mobile application listing on the Apple App Store, Google Play Store, or both via a smart redirect service.
EEvent QR Code: A QR code used for event ticketing, check-in, or registration. When scanned, it validates a ticket, displays event details, or opens an RSVP form.
MMenu QR Code: A QR code used in hospitality settings that links to a digital menu, enabling contactless ordering and reducing the cost of printing physical menus.
DDigital Business Card: An electronic alternative to paper business cards, often delivered via a QR code scan, containing contact details, social links, and a professional profile.
FForeground Colour: The dark pattern colour in a QR code. Must maintain a high contrast ratio against the background colour for reliable scanning across all lighting conditions.
BBackground Colour: The light colour surrounding the dark modules in a QR code. Typically white, but any light colour can be used if contrast with the foreground is sufficient.
DDot Style: A design customisation option that replaces the standard square modules with rounded dots, giving the QR code a more modern and visually appealing appearance.
EEye Shape: The visual design of the three finder-pattern squares (eyes) of a QR code. Can be customised to rounded, circular, or other shapes to enhance brand aesthetics.

Editorial Accuracy Note

All definitions in this glossary are compiled and reviewed by the TheQrify editorial team and cross-referenced with the ISO/IEC 18004:2015 QR code standard, official Denso Wave documentation, and Google's webmaster guidelines. If you believe a definition requires an update, please contact us.

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