QR code
Trademark
UnclaimedA two-dimensional matrix barcode system invented by Denso Wave for rapidly encoding and reading information with imaging devices.
Last updated October 7, 2026
Overview
QR code, short for quick-response code, is a two-dimensional matrix barcode system created in Japan in 1994 by Masahiro Hara and colleagues at Denso Wave, a Denso Group company. It was initially developed for Toyota-related automotive manufacturing, where factories needed to identify and track large numbers of vehicle parts more efficiently than conventional one-dimensional barcodes allowed. A single QR symbol could hold substantially more information, including Japanese kanji and kana characters, while being read quickly from different orientations. The symbol consists of a square grid of dark and light modules. Three prominent finder patterns, usually located in the corners, allow a reader to determine the code’s position, orientation and approximate scale. Additional structural patterns support alignment and timing. Data is encoded through standardized modes including numeric, alphanumeric, byte or binary, and kanji. Reed–Solomon error correction allows a code to remain readable when part of its surface is dirty, obscured or damaged. The system therefore combines high information density with practical tolerance for imperfect printing and scanning. Denso Wave made the QR Code specification broadly available rather than pursuing royalties for ordinary use. That decision, together with later standardization through Japanese, international and industry specifications, helped the technology spread beyond factories. QR codes became a general-purpose bridge between physical objects and digital services: scanning can open a web page, display text, add contact information, connect to a wireless network, initiate an email or message, identify a product, validate a ticket, or direct a user into a payment or authentication application. The technology’s commercial identity is unusual. QR Code is associated with Denso Wave and is treated as a trademarked name, but QR symbols can be generated and read by a wide range of independent software, hardware and online services. Denso Wave continues to maintain the official QR Code website and develops related technologies, while international standards define the core symbol formats. Implementations may still differ at the application layer, particularly in the way URLs, contact records, payment data and other payloads are represented. QR codes became increasingly visible in advertising, packaging, ticketing, logistics, education, government forms and restaurants. Smartphone camera applications eventually made scanning a built-in function: Apple devices support native scanning from iOS 11 onward, and modern Android devices generally provide comparable camera-based functionality. The COVID-19 period accelerated adoption for menus, check-in systems, health-related services and contact-minimized transactions. Payment ecosystems in China, India, Singapore and elsewhere also made QR-based transactions an important part of mobile commerce. By the 2020s, QR codes were used for product information, inventory control, digital marketing, loyalty programs, transport tickets, event admission, website login, document workflows and mobile payments. They are also used in banknotes, commemorative coins, virtual stores and some augmented-reality systems. Their flexibility creates privacy and security considerations: a code may conceal a destination URL, redirect users to a fraudulent site, or encode tracking information. QR code is therefore best understood not as a single consumer product or operating company, but as a widely deployed identification and data-carrier technology associated with Denso Wave and implemented across many industries.
History
The QR code system was developed in 1994 at Denso Wave, a Japanese company supplying technology to the automotive industry. The immediate problem was manufacturing control: vehicle components were being identified with multiple conventional barcodes, and workers had to scan numerous labels separately. The Denso Wave team, led by Masahiro Hara, sought a symbol that could consolidate more information into one label and be read quickly in a production environment. The designers chose a square matrix rather than a single linear sequence. The three large finder patterns placed at the corners enable imaging equipment to recognize the symbol and determine its orientation, while timing and alignment structures help the reader reconstruct the grid. Hara has described the visual influence of black and white pieces on a Go board. The team also analyzed printed patterns to select a distinctive ratio for the finder-marker design, reducing the likelihood that the symbol would be confused with ordinary printed material. The resulting system supported numeric, alphanumeric, binary and Japanese kanji encoding. Its ability to contain more information than common UPC-style barcodes, its rapid omnidirectional reading and its Reed–Solomon error correction made it useful in factories. Denso Wave did not restrict ordinary use through a conventional royalty model, allowing manufacturers and software developers to adopt the format widely. The QR Code name nevertheless remains associated with Denso Wave as a trademark. Standardization helped move QR codes beyond automotive production. AIM International recognized the format in 1997, Japan issued JIS X 0510 in 1999, and ISO/IEC published international specifications beginning in 2000. Later revisions clarified the QR Code 2005 format and updated technical procedures. ISO/IEC 23941:2022 defined the rectangular Micro QR Code format, while ISO/IEC 18004:2024 further revised the general QR Code specification. Early consumer uses included Japanese mobile-phone services, where QR codes linked physical advertising, packaging and printed media to web pages and other mobile content. As camera phones and reader applications improved, codes appeared on business cards, signs, magazines, tickets, product labels and transport systems. They could carry URLs, contact records, text and wireless-network credentials, making them a practical form of mobile tagging or object hyperlinking. The spread of smartphones was a major turning point. QR scanning moved from specialized applications into standard camera software, reducing friction for users. Businesses adopted codes for advertising, loyalty offers, product information, warehouse processes, document management and virtual storefronts. Transport operators and event organizers used them as digital tickets, while websites used them for device-assisted login. Payment adoption created another important phase. QR codes became central to several mobile-payment ecosystems, especially in China and India. Singapore developed SGQR to combine multiple participating payment options into a single merchant label. Other countries introduced structured payment payloads and national or industry schemes. QR codes also appeared in commemorative coins, banknotes and public-service documents, showing that the format had become a general information carrier rather than merely a retail-marketing device. The COVID-19 period accelerated use in restaurants, health services, check-in systems and other situations where organizations wanted to reduce physical contact. By the mid-2020s, QR codes were common across commerce, logistics, ticketing, identity services, publishing and advertising. At the same time, their convenience introduced risks: malicious codes can direct users to deceptive websites, collect information or exploit trust in familiar scanning behavior. The enduring significance of QR code lies in its combination of a simple printed representation, substantial data capacity, error tolerance, open ecosystem and compatibility with ordinary imaging devices.
- 2024
ISO/IEC 18004:2024 published
[3]An updated international QR Code specification refines encoding, error correction and structured append functions.
- 2022
Rectangular Micro QR Code standardized
[4]ISO/IEC 23941:2022 defines requirements for the rectangular Micro QR Code format.
- 2017
Singapore develops SGQR
[1]Singapore agencies begin work on a standardized label combining multiple electronic-payment options.
- 2015
ISO/IEC specification revised
[1]ISO/IEC 18004:2015 revises and renames the QR Code 2005 specification.
- 2011
QR codes enter mainstream mobile marketing
[1]Consumer scanning measurements document meaningful use of QR codes and barcodes in homes and retail environments.
- 2011
QR payment method designed by Alipay
[1]Alipay introduces a QR-based payment approach that contributes to the rapid growth of mobile payments in China.
- 2000
First ISO/IEC QR specification
[1]ISO/IEC 18004:2000 defines international requirements for QR Code Models 1 and 2.
- 1999
Japanese Industrial Standard issued
[1]Japan publishes JIS X 0510, supporting broader formal adoption of the technology.
- 1997
AIM International recognition
[1]The QR code format is recognized in an industry standard issued by AIM International.
- 1994
QR code invented at Denso Wave
[1]Masahiro Hara and the Denso Wave team create the system for tracking automobile parts more efficiently than multiple linear barcodes.
Products and positioning
An open, highly recognizable and internationally standardized two-dimensional data carrier that connects physical media with digital information and services.
Two-dimensional barcode symbology · 1994
QR Code Model 2
The widely deployed QR format using a square matrix, corner finder patterns, multiple encoding modes and selectable Reed–Solomon error-correction levels. It supports applications ranging from printed URLs and product labels to tickets, identity records and payments.
Compact two-dimensional barcode
Micro QR Code
A smaller QR-related format intended for applications where available printing or marking space is limited. It provides a compact matrix representation with lower data capacity than a full QR symbol.
Rectangular two-dimensional barcode · 2022
Rectangular Micro QR Code
A rectangular QR-family format standardized for situations where a long, narrow marking area is more practical than a square symbol. The format is covered by ISO/IEC 23941:2022.
Barcode specification · 2006
QR Code 2005
A standardized QR symbol specification associated with the Model 2 format and later ISO/IEC revisions. It helped establish consistent encoding and decoding requirements across implementations.
Marketing campaigns
- 2020Contact-minimized service adoption
Global
Restaurants, retailers, transport operators, public agencies and other organizations expanded QR-code use for menus, check-ins, information access and transactions during COVID-19-related restrictions.
Outcome. The pandemic accelerated public familiarity with camera-based QR scanning.
- 2011Mobile tagging and advertising adoption
Japan · United States · Global
Advertisers and publishers used QR codes to send smartphone users from printed or physical media to websites, offers, contact records and other digital content. This reduced the effort of manually entering a URL and connected offline exposure with measurable online activity.
Outcome. QR codes became a recognized mobile-marketing and physical-to-digital interaction format.
Brand decisions
2017
Standardize Singapore’s multi-provider payment labelStrategyBackground
Merchants faced multiple QR labels when accepting payments through different providers.
Action taken
Singapore government agencies developed SGQR, a combined label designed to support multiple electronic-payment schemes.
Aftermath
A single displayed label could represent several supported payment options, simplifying the merchant and customer experience.
2011
Launch of QR-based mobile payments by AlipayProduct launchBackground
Mobile devices and camera-based scanning were creating new ways to connect printed or displayed codes with digital services.
Action taken
Alipay introduced a QR code payment method, enabling users and merchants to use QR symbols within a mobile-payment workflow.
Aftermath
QR payments became particularly important in China and influenced payment implementations in other markets.
1994
Create a high-capacity automotive tracking codeStrategyBackground
Automotive production required workers to scan multiple one-dimensional barcodes to identify parts and quantities.
Action taken
Denso Wave’s research team developed a square matrix symbol that could consolidate information, support Japanese characters and be read rapidly from different orientations.
Aftermath
The system solved the original factory problem and provided the technical foundation for later commercial, logistical and consumer applications.
Recent events
- 2024
ISO publishes an updated QR Code specification[3]
Regulation · Product generation
ISO/IEC 18004:2024 updated the QR Code symbology specification, including changes intended to improve encoding efficiency, error correction and structured append functionality.
- 2022
Mobile QR code scanning expands in the United States[1]
Other · Product generation
Reported U.S. mobile scanning reached 89 million people, with payments, product information and menus among the leading uses.
- 2020
QR code adoption rises during COVID-19 restrictions[1]
Other
Consumer research in the United States and United Kingdom reported that many respondents had noticed increased QR code use during pandemic-related restrictions, particularly for contact-minimized access and service delivery.
- 2011
QR codes gain visibility in mobile advertising and consumer scanning[1]
Campaign · Other
A U.S. mobile-user measurement cited substantial consumer scanning of QR codes and conventional barcodes, demonstrating the technology’s expansion from industrial identification into retail and advertising.
Sources4 sources
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