# QRCodeFYI — Full Reference

> The world's most comprehensive QR code encyclopedia and toolkit.
> 15 QR code types with full technical specifications.

## Markdown Endpoints

Every content page supports `.md` suffix for LLM-friendly markdown.
Append `.md` to any URL path (e.g., `/type/url.md`).

## QR Code Types (15)
- [URL / Website](https://qrcodefyi.com/type/url/.md): URL QR code — encode any web address into a scannable QR code. Specs, encoding details, and best practices for website QR codes.
- [Plain Text](https://qrcodefyi.com/type/text/.md): Plain text QR code — encode any text message into a QR code. Supports numeric, alphanumeric, byte, and kanji encoding modes.
- [WiFi Network](https://qrcodefyi.com/type/wifi/.md): WiFi QR code — share network credentials instantly. Supports WPA, WEP, and open networks with automatic connection on scan.
- [Contact Card (vCard)](https://qrcodefyi.com/type/vcard/.md): vCard QR code — encode a full contact card (name, phone, email, address) that saves directly to the scanner's address book.
- [Contact Card (MeCard)](https://qrcodefyi.com/type/mecard/.md): MeCard QR code — a compact contact card format by NTT DoCoMo. More space-efficient than vCard with broad scanner support.
- [Email Address](https://qrcodefyi.com/type/email/.md): Email QR code — encode a mailto: link with optional subject and body. Opens the default email client on scan.
- [SMS Message](https://qrcodefyi.com/type/sms/.md): SMS QR code — encode a phone number and pre-written message. Opens the SMS app with recipient and text pre-filled.
- [Phone Number](https://qrcodefyi.com/type/phone/.md): Phone number QR code — encode a tel: URI that initiates a call on scan. Ideal for business cards and customer service signage.
- [Geographic Location](https://qrcodefyi.com/type/geo/.md): Geo location QR code — encode latitude/longitude coordinates that open a maps application on scan.
- [Calendar Event](https://qrcodefyi.com/type/calendar/.md): Calendar event QR code — encode an iCalendar event with title, time, and location that adds directly to the scanner's calendar.
- [Bitcoin Payment](https://qrcodefyi.com/type/bitcoin/.md): Bitcoin QR code — encode a BIP 21 payment URI with address, amount, and label for one-tap cryptocurrency payments.
- [WhatsApp Message](https://qrcodefyi.com/type/whatsapp/.md): WhatsApp QR code — encode a wa.me deep link with phone number and pre-filled message for instant messaging.
- [App Store Link](https://qrcodefyi.com/type/app-store/.md): App Store QR code — encode an app download link for iOS App Store or Google Play with cross-platform smart routing.
- [Social Media Profile](https://qrcodefyi.com/type/social-media/.md): Social media QR code — encode a profile link for Instagram, Twitter, LinkedIn, TikTok, or YouTube that opens directly in the app.
- [PDF File Link](https://qrcodefyi.com/type/pdf/.md): PDF QR code — link to a hosted PDF document for menus, manuals, and brochures accessible with a single scan.

## Guides (150)
- [Adding Your Logo to a QR Code Safely](https://qrcodefyi.com/guide/logo-in-qr-code/.md)
- [Anti-Counterfeiting with QR Codes](https://qrcodefyi.com/guide/anti-counterfeiting-qr/.md)
- [App Store QR Codes: Cross-Platform Download Links](https://qrcodefyi.com/guide/app-store-qr-codes/.md)
- [Artistic and AI-Generated QR Codes](https://qrcodefyi.com/guide/artistic-qr-codes/.md)
- [Avoiding Common QR Code Mistakes](https://qrcodefyi.com/guide/common-mistakes/.md)
- [Batch Dynamic QR Code Generation](https://qrcodefyi.com/guide/batch-dynamic-generation/.md)
- [Batch QR Code Generation via API](https://qrcodefyi.com/guide/batch-api-generation/.md)
- [BCH and Golay Codes in Format and Version Information](https://qrcodefyi.com/guide/bch-golay-codes/.md)
- [Bitcoin Payment QR Codes: BIP 21 URI Guide](https://qrcodefyi.com/guide/bitcoin-qr-codes/.md)
- [Building a QR Code Shortener Service](https://qrcodefyi.com/guide/build-qr-shortener/.md)
- [Calendar Event QR Codes: Add Events With a Scan](https://qrcodefyi.com/guide/calendar-qr-codes/.md)
- [Choosing the Right Error Correction Level](https://qrcodefyi.com/guide/choosing-ec-level/.md)
- [Client-Side QR Code Generation and Scanning](https://qrcodefyi.com/guide/client-side-generation/.md)
- [Codeword Structure and Interleaving](https://qrcodefyi.com/guide/codeword-interleaving/.md)
- [Cross-Border QR Payments: The Interoperability Challenge](https://qrcodefyi.com/guide/cross-border-qr-payments/.md)
- [Cryptographic Signatures in QR Codes](https://qrcodefyi.com/guide/qr-cryptographic-signatures/.md)
- [Dark Mode QR Codes for Digital Displays](https://qrcodefyi.com/guide/dark-mode-qr-codes/.md)
- [Data Capacity vs Error Correction Trade-offs](https://qrcodefyi.com/guide/capacity-ec-tradeoffs/.md)
- [Data Protection (GDPR) and QR Codes](https://qrcodefyi.com/guide/gdpr-qr-codes/.md)
- [Designing QR Codes for Business Cards](https://qrcodefyi.com/guide/qr-code-business-cards/.md)
- [Device-Targeted QR Codes: iOS vs Android Routing](https://qrcodefyi.com/guide/device-targeted-qr-guide/.md)
- [Dynamic QR Code A/B Testing](https://qrcodefyi.com/guide/dynamic-ab-testing/.md)
- [Dynamic QR Code API Integration](https://qrcodefyi.com/guide/api-integration/.md)
- [Dynamic QR Code Costs: Free vs Paid vs Self-Hosted](https://qrcodefyi.com/guide/dynamic-qr-costs/.md)
- [Dynamic QR Code Platforms Compared](https://qrcodefyi.com/guide/dynamic-platforms-compared/.md)
- [Dynamic QR Codes Explained: How URL Redirection Works](https://qrcodefyi.com/guide/dynamic-qr-explained/.md)
- [Dynamic QR Codes for Personalised Marketing](https://qrcodefyi.com/guide/personalised-marketing-qr/.md)
- [Email QR Codes: Pre-filled Messages on Scan](https://qrcodefyi.com/guide/email-qr-codes/.md)
- [Encoding Modes: Numeric, Alphanumeric, Byte, Kanji, and ECI](https://qrcodefyi.com/guide/encoding-modes-explained/.md)
- [Error Correction and Logo Placement: How Much Can You Cover?](https://qrcodefyi.com/guide/ec-logo-placement/.md)
- [Error Correction for Harsh Environments](https://qrcodefyi.com/guide/ec-harsh-environments/.md)
- [Error Correction in Micro QR and rMQR](https://qrcodefyi.com/guide/ec-micro-qr-rmqr/.md)
- [Error Correction Levels L, M, Q, H: How to Choose](https://qrcodefyi.com/guide/error-correction-levels/.md)
- [EU Digital COVID Certificate: QR Code Case Study](https://qrcodefyi.com/guide/eu-dcc-case-study/.md)
- [Future of QR Error Correction: Colored QR and Beyond](https://qrcodefyi.com/guide/future-error-correction/.md)
- [Generating QR Codes in JavaScript](https://qrcodefyi.com/guide/javascript-qr-generation/.md)
- [Generating QR Codes in Python](https://qrcodefyi.com/guide/python-qr-generation/.md)
- [Geographic Location QR Codes: Share Coordinates](https://qrcodefyi.com/guide/geo-location-qr-codes/.md)
- [Geotargeted QR Codes: Location-Based Routing](https://qrcodefyi.com/guide/geotargeted-qr-guide/.md)
- [How Much Damage Can a QR Code Survive?](https://qrcodefyi.com/guide/qr-damage-tolerance/.md)
- [How QR Code Scanning Works: From Camera to Data](https://qrcodefyi.com/guide/how-scanning-works/.md)
- [How Scanners Handle Errors: Decode Algorithm Walkthrough](https://qrcodefyi.com/guide/decode-algorithm/.md)
- [Inverted QR Codes: White on Dark Backgrounds](https://qrcodefyi.com/guide/inverted-qr-codes/.md)
- [Mask Patterns: The Hidden Optimisation in Every QR Code](https://qrcodefyi.com/guide/mask-patterns-explained/.md)
- [Measuring QR Code ROI: Metrics That Matter](https://qrcodefyi.com/guide/qr-code-roi/.md)
- [MeCard vs vCard: Which Contact Format to Choose](https://qrcodefyi.com/guide/mecard-vs-vcard/.md)
- [Micro QR and rMQR: Compact Alternatives to Standard QR](https://qrcodefyi.com/guide/micro-qr-rmqr/.md)
- [Migrating Static QR Codes to Dynamic](https://qrcodefyi.com/guide/migrate-static-to-dynamic/.md)
- [PDF QR Codes: Link to Documents](https://qrcodefyi.com/guide/pdf-qr-codes/.md)
- [Phone Number QR Codes: One-Tap Calling](https://qrcodefyi.com/guide/phone-qr-codes/.md)
- [Plain Text QR Codes: Serial Numbers, Messages, and Raw Data](https://qrcodefyi.com/guide/plain-text-qr-codes/.md)
- [Print Quality and Error Correction: ISO 15415 Grading](https://qrcodefyi.com/guide/print-quality-grading/.md)
- [Privacy Risks of QR Codes: What Scanners Reveal](https://qrcodefyi.com/guide/privacy-risks/.md)
- [QR Code A/B Testing: Optimise Your Campaigns](https://qrcodefyi.com/guide/ab-testing-qr-codes/.md)
- [QR Code Accessibility: WCAG and Inclusive Design](https://qrcodefyi.com/guide/accessibility-guide/.md)
- [QR Code Analytics: What You Can Track](https://qrcodefyi.com/guide/analytics-guide/.md)
- [QR Code Anatomy: Every Component Explained](https://qrcodefyi.com/guide/qr-code-anatomy/.md)
- [QR Code Call-to-Action: Getting People to Actually Scan](https://qrcodefyi.com/guide/qr-call-to-action/.md)
- [QR Code Colour Guide: Beyond Black and White](https://qrcodefyi.com/guide/qr-code-colours/.md)
- [QR Code Data Capacity: Maximum Characters by Version and Mode](https://qrcodefyi.com/guide/data-capacity-reference/.md)
- [QR Code Deployment Checklist](https://qrcodefyi.com/guide/deployment-checklist/.md)
- [QR Code Design Best Practices](https://qrcodefyi.com/guide/design-best-practices/.md)
- [QR Code Design Tools: Free and Paid Options Compared](https://qrcodefyi.com/guide/design-tools-comparison/.md)
- [QR Code Encoding Algorithm: Step-by-Step Implementation](https://qrcodefyi.com/guide/encoding-algorithm/.md)
- [QR Code Expiration and Access Control](https://qrcodefyi.com/guide/expiration-access-control/.md)
- [QR Code Frames and Borders](https://qrcodefyi.com/guide/frames-and-borders/.md)
- [QR Code Generation in CI/CD Pipelines](https://qrcodefyi.com/guide/ci-cd-qr-generation/.md)
- [QR Code Generation Libraries: Python, JavaScript, and More](https://qrcodefyi.com/guide/generation-libraries/.md)
- [QR Code Generation with Custom Design: Developer Guide](https://qrcodefyi.com/guide/custom-design-dev/.md)
- [QR Code Incident Response: When Things Go Wrong](https://qrcodefyi.com/guide/incident-response/.md)
- [QR Code Link Rot: Prevention and Monitoring](https://qrcodefyi.com/guide/link-rot-prevention/.md)
- [QR Code Maintenance: Keeping Codes Working Long-Term](https://qrcodefyi.com/guide/maintenance-guide/.md)
- [QR Code Malware: Threats and Mitigation](https://qrcodefyi.com/guide/qr-malware-threats/.md)
- [QR Code Material Selection: From Paper to Metal](https://qrcodefyi.com/guide/material-selection/.md)
- [QR Code Payment Standards by Country](https://qrcodefyi.com/guide/payment-standards-country/.md)
- [QR Code Performance: Generation and Scanning Speed](https://qrcodefyi.com/guide/performance-optimization/.md)
- [QR Code Placement Strategy: Where to Put Your Codes](https://qrcodefyi.com/guide/placement-strategy/.md)
- [QR Code Printing: Paper, Ink, and Resolution](https://qrcodefyi.com/guide/printing-guide/.md)
- [QR Code Quiet Zone: The Most Ignored Requirement](https://qrcodefyi.com/guide/quiet-zone-guide/.md)
- [QR Code Reading and Decoding in Code](https://qrcodefyi.com/guide/reading-decoding-code/.md)
- [QR Code Regulations and Legal Considerations](https://qrcodefyi.com/guide/regulations-legal/.md)
- [QR Codes and Accessibility APIs](https://qrcodefyi.com/guide/accessibility-api/.md)
- [QR Code Security Audit Checklist](https://qrcodefyi.com/guide/security-audit-checklist/.md)
- [QR Code Security for Enterprise Deployment](https://qrcodefyi.com/guide/enterprise-security/.md)
- [QR Codes for Business Cards: The Digital Networking Guide](https://qrcodefyi.com/guide/business-card-networking/.md)
- [QR Codes for Coupons and Promotions](https://qrcodefyi.com/guide/coupon-promotion-qr/.md)
- [QR Codes for Customer Feedback and Reviews](https://qrcodefyi.com/guide/feedback-reviews-qr/.md)
- [QR Codes for Education and Training](https://qrcodefyi.com/guide/education-qr-codes/.md)
- [QR Codes for Events: Registration to Follow-Up](https://qrcodefyi.com/guide/event-qr-codes/.md)
- [QR Codes for Large Format: Billboards, Banners, and Signage](https://qrcodefyi.com/guide/large-format-qr/.md)
- [QR Codes for Loyalty Programs](https://qrcodefyi.com/guide/loyalty-program-qr/.md)
- [QR Codes for Product Packaging Design](https://qrcodefyi.com/guide/packaging-design/.md)
- [QR Codes for Real Estate: Listings and Virtual Tours](https://qrcodefyi.com/guide/real-estate-qr/.md)
- [QR Codes for Restaurants: Beyond the Menu](https://qrcodefyi.com/guide/restaurant-qr-codes/.md)
- [QR Codes for Retail: In-Store and E-Commerce](https://qrcodefyi.com/guide/retail-qr-codes/.md)
- [QR Codes for Screen Display: TVs, Monitors, and Projectors](https://qrcodefyi.com/guide/screen-display-guide/.md)
- [QR Codes for Two-Factor Authentication (2FA)](https://qrcodefyi.com/guide/2fa-qr-codes/.md)
- [QR Codes in Africa: M-Pesa and Mobile-First Markets](https://qrcodefyi.com/guide/qr-codes-africa/.md)
- [QR Codes in Brazil: Pix and Financial Revolution](https://qrcodefyi.com/guide/qr-codes-brazil/.md)
- [QR Codes in China: Mobile Payments and Beyond](https://qrcodefyi.com/guide/qr-codes-china/.md)
- [QR Codes in Emails: When and How](https://qrcodefyi.com/guide/email-qr-codes-guide/.md)
- [QR Codes in Europe: GDPR, Health Passes, and Payments](https://qrcodefyi.com/guide/qr-codes-europe/.md)
- [QR Codes in Government Services Worldwide](https://qrcodefyi.com/guide/government-qr-global/.md)
- [QR Codes in Healthcare: Global Implementations](https://qrcodefyi.com/guide/qr-healthcare-global/.md)
- [QR Codes in India: UPI and Digital India](https://qrcodefyi.com/guide/qr-codes-india/.md)
- [QR Codes in Japan: Where It All Began](https://qrcodefyi.com/guide/qr-codes-japan/.md)
- [QR Codes in Low-Light and Outdoor Environments](https://qrcodefyi.com/guide/low-light-outdoor/.md)
- [QR Codes in Marketing: Strategy and Best Practices](https://qrcodefyi.com/guide/marketing-strategy/.md)
- [QR Codes in Mobile Apps: Native Generation and Scanning](https://qrcodefyi.com/guide/mobile-app-qr/.md)
- [QR Codes in Southeast Asia: GrabPay, GoPay, and More](https://qrcodefyi.com/guide/qr-codes-southeast-asia/.md)
- [QR Codes in South Korea: KakaoTalk and Smart Cities](https://qrcodefyi.com/guide/qr-codes-korea/.md)
- [QR Codes in the United States: From Skepticism to Mainstream](https://qrcodefyi.com/guide/qr-codes-usa/.md)
- [QR Code Size Calculator: Print Size for Every Distance](https://qrcodefyi.com/guide/size-calculator-guide/.md)
- [QR Code Sizing: Minimum Size for Every Distance](https://qrcodefyi.com/guide/sizing-guide/.md)
- [QR Codes on Curved Surfaces](https://qrcodefyi.com/guide/curved-surfaces/.md)
- [QR Codes on Print Advertising](https://qrcodefyi.com/guide/print-advertising-qr/.md)
- [QR Code Standards: ISO 18004 and Beyond](https://qrcodefyi.com/guide/qr-code-standards/.md)
- [QR Code Sticker Attacks: Detection and Prevention](https://qrcodefyi.com/guide/sticker-attack-prevention/.md)
- [QR Code URL Shortening: When and How](https://qrcodefyi.com/guide/url-shortening/.md)
- [QR Code Versions 1-40: Size, Capacity, and Selection](https://qrcodefyi.com/guide/qr-code-versions/.md)
- [QR Code Version Selection: Balancing Size and Data](https://qrcodefyi.com/guide/version-selection-guide/.md)
- [QR Code vs Barcode: Why 2D Won](https://qrcodefyi.com/guide/qr-code-vs-barcode/.md)
- [QRishing: How QR Code Phishing Works](https://qrcodefyi.com/guide/qrishing-explained/.md)
- [Reed-Solomon Codes: The Math Behind QR Error Correction](https://qrcodefyi.com/guide/reed-solomon-math/.md)
- [Reed-Solomon Error Correction in QR Codes](https://qrcodefyi.com/guide/reed-solomon-explained/.md)
- [Rounded and Circular Module Styles](https://qrcodefyi.com/guide/rounded-module-styles/.md)
- [Safe QR Code Scanning: A Consumer Guide](https://qrcodefyi.com/guide/safe-scanning-guide/.md)
- [Secure QR Code Generation: Best Practices for Developers](https://qrcodefyi.com/guide/secure-generation/.md)
- [Self-Hosted Dynamic QR Codes: DIY Guide](https://qrcodefyi.com/guide/self-hosted-dynamic-qr/.md)
- [Server-Side QR Code Generation for Web Apps](https://qrcodefyi.com/guide/server-side-generation/.md)
- [Setting Up Custom Domains for Dynamic QR Codes](https://qrcodefyi.com/guide/custom-domains-qr/.md)
- [SMS QR Codes: One-Tap Messaging](https://qrcodefyi.com/guide/sms-qr-codes/.md)
- [Social Media QR Codes: Profile and Channel Links](https://qrcodefyi.com/guide/social-media-qr-codes/.md)
- [SQRC: Secure QR Codes with Encrypted Data](https://qrcodefyi.com/guide/sqrc-secure-qr/.md)
- [Static vs Dynamic QR Codes: Pros, Cons, and When to Use Each](https://qrcodefyi.com/guide/static-vs-dynamic/.md)
- [Structured Append: Splitting Data Across Multiple QR Codes](https://qrcodefyi.com/guide/structured-append/.md)
- [SVG vs PNG vs PDF: QR Code Export Formats](https://qrcodefyi.com/guide/export-formats/.md)
- [Testing QR Code Error Correction: Practical Experiments](https://qrcodefyi.com/guide/testing-error-correction/.md)
- [Testing QR Code Generation: Unit and Integration Tests](https://qrcodefyi.com/guide/testing-qr-generation/.md)
- [Testing QR Codes: A Complete Verification Guide](https://qrcodefyi.com/guide/testing-guide/.md)
- [The Finder Pattern: Why QR Codes Have Three Squares](https://qrcodefyi.com/guide/finder-pattern-deep-dive/.md)
- [The Future of QR Codes: Trends and Predictions](https://qrcodefyi.com/guide/future-of-qr-codes/.md)
- [The History of QR Codes: From Toyota to Global Standard](https://qrcodefyi.com/guide/history-of-qr-codes/.md)
- [URL QR Codes: The Complete Guide](https://qrcodefyi.com/guide/url-qr-codes/.md)
- [UTM Tracking with QR Codes: Measure Every Scan](https://qrcodefyi.com/guide/utm-tracking-qr/.md)
- [vCard QR Codes: Digital Business Cards That Work](https://qrcodefyi.com/guide/vcard-qr-codes/.md)
- [What Is a QR Code? A Complete Introduction](https://qrcodefyi.com/guide/what-is-a-qr-code/.md)
- [WhatsApp QR Codes: Start Conversations Instantly](https://qrcodefyi.com/guide/whatsapp-qr-codes/.md)
- [When Error Correction Fails: Debugging Unreadable QR Codes](https://qrcodefyi.com/guide/debugging-unreadable-qr/.md)
- [WiFi QR Codes: Share Network Credentials Instantly](https://qrcodefyi.com/guide/wifi-qr-codes/.md)

## Use Cases (20)
- [Art & Museums](https://qrcodefyi.com/use-case/art-museums/.md): QR codes placed beside artworks and exhibits in museums and galleries linking to
- [Authentication (2FA/TOTP)](https://qrcodefyi.com/use-case/authentication-2fa/.md): QR codes encoding otpauth:// URIs used to configure time-based one-time password
- [Contact Sharing](https://qrcodefyi.com/use-case/contact-sharing/.md): Digital business cards using vCard or MeCard QR codes that save a full contact e
- [Cryptocurrency & Bitcoin](https://qrcodefyi.com/use-case/cryptocurrency/.md): QR codes encoding cryptocurrency wallet addresses and payment requests using BIP
- [Digital Payments](https://qrcodefyi.com/use-case/digital-payments/.md): QR code-based payment systems used by merchants and consumers worldwide. Standar
- [Education](https://qrcodefyi.com/use-case/education/.md): QR codes in textbooks, worksheets, classroom displays, and museum exhibits that 
- [Event Tickets](https://qrcodefyi.com/use-case/event-tickets/.md): QR codes embedded in digital or printed event tickets for rapid check-in and adm
- [Government Services](https://qrcodefyi.com/use-case/government-services/.md): QR codes on government IDs, tax forms, official documents, and public service no
- [Healthcare](https://qrcodefyi.com/use-case/healthcare/.md): QR codes on patient wristbands, medication packaging, medical equipment, and hea
- [Loyalty Programmes](https://qrcodefyi.com/use-case/loyalty-programmes/.md): QR codes on loyalty cards, receipts, and in-store displays that link to digital 
- [Manufacturing](https://qrcodefyi.com/use-case/manufacturing/.md): QR codes laser-etched or printed on components, assemblies, and finished goods f
- [Marketing & Advertising](https://qrcodefyi.com/use-case/marketing-advertising/.md): QR codes on print ads, billboards, direct mail, and product packaging that bridg
- [Product Packaging](https://qrcodefyi.com/use-case/product-packaging/.md): QR codes printed on product labels, boxes, and inserts that link consumers to us
- [Real Estate](https://qrcodefyi.com/use-case/real-estate/.md): QR codes on property listings, for-sale signs, open house flyers, and brochures 
- [Restaurant Menus](https://qrcodefyi.com/use-case/restaurant-menus/.md): Contactless digital menus accessed by scanning a table-top QR code. Restaurants 
- [Retail & Point of Sale](https://qrcodefyi.com/use-case/retail-pos/.md): QR codes at the point of sale linking to loyalty programmes, product reviews, si
- [Social Media Links](https://qrcodefyi.com/use-case/social-media-links/.md): QR codes linking to social media profiles, channels, or specific posts on Instag
- [Tourism & Travel](https://qrcodefyi.com/use-case/tourism-travel/.md): QR codes at tourist attractions, hotels, and travel agencies linking to multi-la
- [Transportation](https://qrcodefyi.com/use-case/transportation/.md): QR codes on boarding passes, transit cards, parking meters, and vehicle identifi
- [WiFi Sharing](https://qrcodefyi.com/use-case/wifi-sharing/.md): QR codes that encode WiFi network credentials for instant connection without man

## Key Glossary Terms
- [Custom QR Code](https://qrcodefyi.com/glossary/custom-qr/.md): A QR code modified with brand colours, rounded modules, logos, or artistic eleme
- [Data Capacity](https://qrcodefyi.com/glossary/capacity/.md): The maximum number of characters a QR code can store, varying by version, EC lev
- [DENSO WAVE](https://qrcodefyi.com/glossary/denso-wave/.md): The Japanese company that invented the QR code in 1994. DENSO WAVE (a subsidiary
- [Dynamic QR Code](https://qrcodefyi.com/glossary/dynamic-qr-code/.md): A QR code that encodes a short redirect URL rather than the final destination. T
- [Encoding Mode](https://qrcodefyi.com/glossary/encoding-mode/.md): The data encoding method used within a QR code segment. ISO 18004 defines four s
- [Error Correction Level](https://qrcodefyi.com/glossary/error-correction-level/.md): One of four levels determining how much damage a QR code can sustain: L (7% reco
- [Finder Pattern](https://qrcodefyi.com/glossary/finder-pattern/.md): Three identical 7x7 module squares in the top-left, top-right, and bottom-left c
- [ISO/IEC 18004](https://qrcodefyi.com/glossary/iso-18004/.md): The primary international standard defining QR Code symbology — symbol structure
- [Masahiro Hara](https://qrcodefyi.com/glossary/masahiro-hara/.md): The lead engineer at DENSO WAVE who invented the QR code in 1994. Hara's team de
- [Micro QR Code](https://qrcodefyi.com/glossary/micro-qr/.md): A compact QR code variant with only one finder pattern (vs three in standard QR)
- [Module](https://qrcodefyi.com/glossary/module/.md): The smallest unit of a QR code — a single dark or light square. A Version 1 QR c
- [QR Code Payment](https://qrcodefyi.com/glossary/qr-payment/.md): Using QR codes for financial transactions: merchant-presented (customer scans me
- [QR Code Scanner](https://qrcodefyi.com/glossary/qr-scanner/.md): A device or software application that captures a QR code image and decodes its d
- [QRishing](https://qrcodefyi.com/glossary/qrishing/.md): A phishing attack using QR codes to direct victims to malicious websites. Attack
- [Quick Response](https://qrcodefyi.com/glossary/quick-response/.md): The meaning behind 'QR' in QR code. DENSO WAVE named it 'Quick Response' because
- [Quiet Zone](https://qrcodefyi.com/glossary/quiet-zone/.md): The mandatory white margin surrounding the QR code, at least 4 modules wide on a
- [Reed-Solomon Code](https://qrcodefyi.com/glossary/reed-solomon/.md): The error-correcting code used in QR codes' data region. Reed-Solomon codes oper
- [Static QR Code](https://qrcodefyi.com/glossary/static-qr-code/.md): A QR code that encodes its final data directly — the encoded content cannot be c
- [Version](https://qrcodefyi.com/glossary/version/.md): The size designation of a QR code, ranging from Version 1 (21x21 modules) to Ver

## Interactive Tools (10)
- [Batch QR Code Generator](https://qrcodefyi.com/tools/batch-generator/): Upload a CSV file to generate QR codes in bulk. Supports multiple types per batc
- [QR Code Capacity Calculator](https://qrcodefyi.com/tools/capacity-calculator/): Calculate the minimum QR code version needed for your data. Shows capacity used 
- [QR Code Comparison Tool](https://qrcodefyi.com/tools/qr-comparison/): Compare two QR codes side by side. Enter different data or settings and see how 
- [QR Code Data Encoder/Decoder](https://qrcodefyi.com/tools/data-encoder/): Explore how QR codes encode data at the bit level. Enter data and see the encodi
- [QR Code Generator](https://qrcodefyi.com/tools/qr-generator/): Generate QR codes for URLs, WiFi, vCards, email, SMS, and more. Customize colors
- [QR Code Reader](https://qrcodefyi.com/tools/qr-reader/): Scan and decode QR codes using your device camera or by uploading an image. Dete
- [QR Code Size Calculator](https://qrcodefyi.com/tools/size-calculator/): Calculate the optimal physical size for your QR code based on scanning distance,
- [QR Code Validator](https://qrcodefyi.com/tools/qr-validator/): Upload a QR code image to analyze its quality. Checks version, error correction,
- [vCard QR Code Generator](https://qrcodefyi.com/tools/vcard-generator/): Generate a QR code containing your contact information in vCard format. Supports
- [WiFi QR Code Generator](https://qrcodefyi.com/tools/wifi-generator/): Create a QR code that connects to WiFi automatically when scanned. Supports WPA2

## Versions (40)
- [Version 1](https://qrcodefyi.com/version/1/.md): 21x21 modules, 208 data modules
- [Version 2](https://qrcodefyi.com/version/2/.md): 25x25 modules, 359 data modules
- [Version 3](https://qrcodefyi.com/version/3/.md): 29x29 modules, 567 data modules
- [Version 4](https://qrcodefyi.com/version/4/.md): 33x33 modules, 807 data modules
- [Version 5](https://qrcodefyi.com/version/5/.md): 37x37 modules, 1079 data modules
- [Version 6](https://qrcodefyi.com/version/6/.md): 41x41 modules, 1383 data modules
- [Version 7](https://qrcodefyi.com/version/7/.md): 45x45 modules, 1568 data modules
- [Version 8](https://qrcodefyi.com/version/8/.md): 49x49 modules, 1936 data modules
- [Version 9](https://qrcodefyi.com/version/9/.md): 53x53 modules, 2336 data modules
- [Version 10](https://qrcodefyi.com/version/10/.md): 57x57 modules, 2768 data modules
- [Version 11](https://qrcodefyi.com/version/11/.md): 61x61 modules, 3232 data modules
- [Version 12](https://qrcodefyi.com/version/12/.md): 65x65 modules, 3728 data modules
- [Version 13](https://qrcodefyi.com/version/13/.md): 69x69 modules, 4256 data modules
- [Version 14](https://qrcodefyi.com/version/14/.md): 73x73 modules, 4651 data modules
- [Version 15](https://qrcodefyi.com/version/15/.md): 77x77 modules, 5243 data modules
- [Version 16](https://qrcodefyi.com/version/16/.md): 81x81 modules, 5867 data modules
- [Version 17](https://qrcodefyi.com/version/17/.md): 85x85 modules, 6523 data modules
- [Version 18](https://qrcodefyi.com/version/18/.md): 89x89 modules, 7211 data modules
- [Version 19](https://qrcodefyi.com/version/19/.md): 93x93 modules, 7931 data modules
- [Version 20](https://qrcodefyi.com/version/20/.md): 97x97 modules, 8683 data modules
- [Version 21](https://qrcodefyi.com/version/21/.md): 101x101 modules, 9252 data modules
- [Version 22](https://qrcodefyi.com/version/22/.md): 105x105 modules, 10068 data modules
- [Version 23](https://qrcodefyi.com/version/23/.md): 109x109 modules, 10916 data modules
- [Version 24](https://qrcodefyi.com/version/24/.md): 113x113 modules, 11796 data modules
- [Version 25](https://qrcodefyi.com/version/25/.md): 117x117 modules, 12708 data modules
- [Version 26](https://qrcodefyi.com/version/26/.md): 121x121 modules, 13652 data modules
- [Version 27](https://qrcodefyi.com/version/27/.md): 125x125 modules, 14628 data modules
- [Version 28](https://qrcodefyi.com/version/28/.md): 129x129 modules, 15371 data modules
- [Version 29](https://qrcodefyi.com/version/29/.md): 133x133 modules, 16411 data modules
- [Version 30](https://qrcodefyi.com/version/30/.md): 137x137 modules, 17483 data modules
- [Version 31](https://qrcodefyi.com/version/31/.md): 141x141 modules, 18587 data modules
- [Version 32](https://qrcodefyi.com/version/32/.md): 145x145 modules, 19723 data modules
- [Version 33](https://qrcodefyi.com/version/33/.md): 149x149 modules, 20891 data modules
- [Version 34](https://qrcodefyi.com/version/34/.md): 153x153 modules, 22091 data modules
- [Version 35](https://qrcodefyi.com/version/35/.md): 157x157 modules, 23008 data modules
- [Version 36](https://qrcodefyi.com/version/36/.md): 161x161 modules, 24272 data modules
- [Version 37](https://qrcodefyi.com/version/37/.md): 165x165 modules, 25568 data modules
- [Version 38](https://qrcodefyi.com/version/38/.md): 169x169 modules, 26896 data modules
- [Version 39](https://qrcodefyi.com/version/39/.md): 173x173 modules, 28256 data modules
- [Version 40](https://qrcodefyi.com/version/40/.md): 177x177 modules, 29648 data modules

## Comparisons (24)
- [Alphanumeric vs Byte Encoding Mode](https://qrcodefyi.com/compare/alphanumeric-vs-byte-mode/.md)
- [Bitcoin QR Code vs URL QR Code](https://qrcodefyi.com/compare/bitcoin-vs-url/.md)
- [Byte vs Kanji Encoding Mode](https://qrcodefyi.com/compare/byte-vs-kanji-mode/.md)
- [Calendar Event QR Code vs URL QR Code](https://qrcodefyi.com/compare/calendar-vs-url/.md)
- [Email QR Code vs SMS QR Code](https://qrcodefyi.com/compare/email-vs-sms/.md)
- [Geo Location QR Code vs URL QR Code](https://qrcodefyi.com/compare/geo-vs-url/.md)
- [Numeric vs Alphanumeric Encoding Mode](https://qrcodefyi.com/compare/numeric-vs-alphanumeric-mode/.md)
- [Phone Call QR Code vs SMS QR Code](https://qrcodefyi.com/compare/phone-vs-sms/.md)
- [QR Code EC Level L vs Level H](https://qrcodefyi.com/compare/ec-level-l-vs-h/.md)
- [QR Code EC Level M vs Level Q](https://qrcodefyi.com/compare/ec-level-m-vs-q/.md)
- [QR Code for Business Card vs QR Code for Poster](https://qrcodefyi.com/compare/business-card-vs-poster/.md)
- [QR Code for Marketing vs QR Code for Payments](https://qrcodefyi.com/compare/marketing-vs-payments/.md)
- [QR Code for Print vs QR Code for Screen](https://qrcodefyi.com/compare/print-vs-screen/.md)
- [QR Code PNG vs SVG Export](https://qrcodefyi.com/compare/png-vs-svg-export/.md)
- [QR Code vs Aztec Code](https://qrcodefyi.com/compare/qr-code-vs-aztec/.md)
- [QR Code vs Data Matrix](https://qrcodefyi.com/compare/qr-code-vs-data-matrix/.md)
- [QR Code vs Micro QR Code](https://qrcodefyi.com/compare/qr-code-vs-micro-qr/.md)
- [QR Code vs PDF417](https://qrcodefyi.com/compare/qr-code-vs-pdf417/.md)
- [QR Code vs rMQR Code](https://qrcodefyi.com/compare/qr-code-vs-rmqr/.md)
- [Static QR Code vs Dynamic QR Code](https://qrcodefyi.com/compare/static-vs-dynamic/.md)
- [URL QR Code vs Plain Text QR Code](https://qrcodefyi.com/compare/url-vs-text/.md)
- [vCard QR Code vs MeCard QR Code](https://qrcodefyi.com/compare/vcard-vs-mecard/.md)
- [WiFi QR Code vs URL QR Code](https://qrcodefyi.com/compare/wifi-vs-url/.md)
- [WiFi QR: WPA2 vs WPA3](https://qrcodefyi.com/compare/wifi-wpa2-vs-wpa3/.md)

## Page Types
- /type/{slug}/ — Detailed QR code type page with specs
- /type/{type}/for-{use-case}/ — Use-case-specific QR code guide
- /version/{number}/ — QR code version specification
- /anatomy/{slug}/ — QR code component anatomy
- /encoding/{slug}/ — Encoding mode details
- /standard/{slug}/ — QR code standard reference
- /use-case/{slug}/ — QR code use case
- /recipe/{slug}/ — Step-by-step QR code recipe
- /scenario/{slug}/ — Scan scenario guide
- /guide/{slug}/ — In-depth QR code guide
- /glossary/{slug}/ — QR code terminology
- /tools/{slug}/ — Interactive QR code tools
- /compare/{slug}/ — QR code comparison

## Data Sources
- ISO/IEC 18004 QR Code standard
- AIM specification for QR Code symbology

## Related
- [BarcodeFYI](https://barcodefyi.com/llms.txt) — The Barcode Encyclopedia & Toolkit (30 symbologies)
- [NFCFYI](https://nfcfyi.com/llms.txt) — The NFC Encyclopedia & Toolkit
- [BLEFYI](https://blefyi.com/llms.txt) — The BLE Encyclopedia & Toolkit
- [RFIDFYI](https://rfidfyi.com/llms.txt) — The RFID Encyclopedia & Toolkit
- [SmartCardFYI](https://smartcardfyi.com/llms.txt) — The Smart Card Encyclopedia & Toolkit