# QRCodeFYI > Comprehensive QR code reference for developers and businesses. Covers QR code types (URL, WiFi, vCard, etc.), versions 1-40 with capacity data, encoding modes, QR code anatomy, standards, use cases, recipes, scan scenarios, interactive tools (generator, reader, capacity calculator), glossary, and guides. 15 languages supported. ## Data Scope - QR code content types with encoding prefixes and field schemas - QR code versions 1-40 with module count, capacity per error correction level - QR code anatomy: finder patterns, timing patterns, alignment patterns, format/version info - Encoding modes: numeric, alphanumeric, byte, kanji, ECI - ISO/AIM QR code standards - Use cases for QR codes across industries - QR code recipes — step-by-step generation guides for specific scenarios - Scan scenarios — real-world scanning situations and troubleshooting - Interactive tools: QR generator, reader, capacity calculator, size calculator, validator, batch generator, WiFi generator, vCard generator, data encoder - Side-by-side QR code comparisons - Glossary of QR code terminology - In-depth guides organized by series ## URL Patterns - Append `.md` to any URL for plain-text markdown format. - i18n: URL prefix `/{lang}` for non-English (ko, ja, zh-hans, es, fr, de, pt, ru, vi, tr, ar, hi, th, id). - `/type/` — Browse all QR code content types (e.g. `/type/`) - `/type/{slug}/` — QR code type detail with encoding specs (e.g. `/type/url/`) - `/version/` — QR code versions 1-40 (e.g. `/version/`) - `/version/{version}/` — Version detail with capacity table (e.g. `/version/1/`) - `/anatomy/` — Interactive QR code anatomy explorer (e.g. `/anatomy/`) - `/anatomy/{slug}/` — QR code component detail (e.g. `/anatomy/finder-pattern/`) - `/encoding/` — QR code encoding modes (e.g. `/encoding/`) - `/encoding/{slug}/` — Encoding mode detail (e.g. `/encoding/numeric/`) - `/standard/` — QR code standards (ISO, AIM) (e.g. `/standard/`) - `/standard/{slug}/` — Standard detail (e.g. `/standard/iso-18004/`) - `/use-case/` — QR code use cases (e.g. `/use-case/`) - `/use-case/{slug}/` — Use case detail (e.g. `/use-case/restaurant-menus/`) - `/recipe/` — QR code recipes (e.g. `/recipe/`) - `/recipe/{slug}/` — Recipe detail (e.g. `/recipe/wifi-qr-restaurant/`) - `/scenario/` — QR code scan scenarios (e.g. `/scenario/`) - `/scenario/{slug}/` — Scan scenario detail (e.g. `/scenario/restaurant-table/`) - `/glossary/` — QR code terminology glossary (e.g. `/glossary/`) - `/glossary/{slug}/` — Glossary term detail (e.g. `/glossary/finder-pattern/`) - `/guide/` — In-depth QR code guides (e.g. `/guide/`) - `/guide/{slug}/` — Guide article (e.g. `/guide/qr-code-versions/`) - `/tools/` — Interactive QR code tools (e.g. `/tools/`) - `/tools/qr-generator/` — Generate QR codes online (e.g. `/tools/qr-generator/`) - `/tools/qr-reader/` — Scan and decode QR codes (e.g. `/tools/qr-reader/`) - `/tools/capacity-calculator/` — QR code capacity calculator (e.g. `/tools/capacity-calculator/`) - `/tools/size-calculator/` — QR code size calculator (e.g. `/tools/size-calculator/`) - `/tools/qr-validator/` — Validate QR code content (e.g. `/tools/qr-validator/`) - `/tools/batch-generator/` — Batch QR code generator (e.g. `/tools/batch-generator/`) - `/tools/wifi-generator/` — WiFi QR code generator (e.g. `/tools/wifi-generator/`) - `/tools/vcard-generator/` — vCard QR code generator (e.g. `/tools/vcard-generator/`) - `/tools/qr-comparison/` — QR code comparison tool (e.g. `/tools/qr-comparison/`) - `/tools/data-encoder/` — QR data encoder (e.g. `/tools/data-encoder/`) - `/compare/` — QR code comparison index (e.g. `/compare/`) - `/compare/{slug}/` — Side-by-side comparison (e.g. `/compare/alphanumeric-vs-byte-mode/`) - `/search/` — Search types, terms, guides (e.g. `/search/?q=wifi`) ## QR Code Types & Versions - [QR Code Content Types](https://qrcodefyi.com/type/) - [QR Code Versions (1-40)](https://qrcodefyi.com/version/) - [QR Code Anatomy Explorer](https://qrcodefyi.com/anatomy/) - [Encoding Modes](https://qrcodefyi.com/encoding/) ## Standards & Use Cases - [QR Code Standards](https://qrcodefyi.com/standard/) - [Use Cases](https://qrcodefyi.com/use-case/) - [QR Code Recipes](https://qrcodefyi.com/recipe/) - [Scan Scenarios](https://qrcodefyi.com/scenario/) ## Interactive Tools - [QR Code Generator](https://qrcodefyi.com/tools/qr-generator/) - [QR Code Reader / Scanner](https://qrcodefyi.com/tools/qr-reader/) - [Capacity Calculator](https://qrcodefyi.com/tools/capacity-calculator/) - [Size Calculator](https://qrcodefyi.com/tools/size-calculator/) - [QR Validator](https://qrcodefyi.com/tools/qr-validator/) - [Batch Generator](https://qrcodefyi.com/tools/batch-generator/) - [WiFi QR Generator](https://qrcodefyi.com/tools/wifi-generator/) - [vCard QR Generator](https://qrcodefyi.com/tools/vcard-generator/) - [QR Comparison Tool](https://qrcodefyi.com/tools/qr-comparison/) - [Data Encoder](https://qrcodefyi.com/tools/data-encoder/) ## Learn - [Glossary](https://qrcodefyi.com/glossary/) - [Guides](https://qrcodefyi.com/guide/) - [Comparisons](https://qrcodefyi.com/compare/) ## Embed Widget - [QRCodeFYI Widget Docs](https://widget.qrcodefyi.com) - [qrcodefyi-embed on npm](https://www.npmjs.com/package/qrcodefyi-embed) - [qrcodefyi-embed on GitHub](https://github.com/fyipedia/qrcodefyi-embed) ## REST API Free REST API. No authentication required. JSON responses. CORS enabled. | Method | Endpoint | Description | |--------|----------|-------------| | GET | `/api/v1/types/` | List all QR code content types | | GET | `/api/v1/types/{slug}/` | QR code type detail | | GET | `/api/v1/versions/` | QR code versions 1-40 | | GET | `/api/v1/versions/{version}/` | Version detail with capacity | | GET | `/api/v1/components/` | QR code anatomy components | | GET | `/api/v1/encoding-modes/` | Encoding modes | | GET | `/api/v1/standards/` | QR code standards | | GET | `/api/v1/use-cases/` | Use cases | | GET | `/api/v1/recipes/` | QR code recipes | | GET | `/api/v1/scan-scenarios/` | Scan scenarios | | GET | `/api/v1/comparisons/` | QR code comparisons | | GET | `/api/v1/glossary/` | Glossary terms | | GET | `/api/v1/guides/` | Guide articles | | GET | `/api/v1/tools/` | Interactive tools | | GET | `/api/v1/faqs/` | FAQs | | GET | `/api/v1/stats/` | Site statistics | | GET | `/api/v1/search/?q={query}` | Search across all content | ```bash curl -s "https://qrcodefyi.com/api/v1/types/" ``` [API Docs](https://qrcodefyi.com/developers/) · [OpenAPI Spec](https://qrcodefyi.com/api/openapi.json) ## Developer Tools - **PyPI**: `pip install qrcodefyi` — [qrcodefyi](https://pypi.org/project/qrcodefyi/) — QR code type data, version capacity, encoding mode reference - **RubyGems**: `gem install qrcodefyi` — [qrcodefyi](https://rubygems.org/gems/qrcodefyi) — Ruby QR code reference - **crates.io**: `cargo add qrcodefyi` — [qrcodefyi](https://crates.io/crates/qrcodefyi) — Rust QR code reference - **Embed Widget**: [qrcodefyi-embed](https://widget.qrcodefyi.com) ## Tag FYI Family Part of [FYIPedia](https://fyipedia.com) developer tools ecosystem. - [BarcodeFYI](https://barcodefyi.com) — Barcode formats, EAN, UPC, ISBN standards - [NFCFYI](https://nfcfyi.com) — NFC tags, NDEF, contactless payments - [BLEFYI](https://blefyi.com) — Bluetooth Low Energy, GATT, beacons - [RFIDFYI](https://rfidfyi.com) — RFID tags, frequency bands, standards - [SmartCardFYI](https://smartcardfyi.com) — Smart cards, EMV, APDU, Java Card ## All QR Code Types - [URL / Website](https://qrcodefyi.com/type/url/) - [Plain Text](https://qrcodefyi.com/type/text/) - [WiFi Network](https://qrcodefyi.com/type/wifi/) - [Contact Card (vCard)](https://qrcodefyi.com/type/vcard/) - [Contact Card (MeCard)](https://qrcodefyi.com/type/mecard/) - [Email Address](https://qrcodefyi.com/type/email/) - [SMS Message](https://qrcodefyi.com/type/sms/) - [Phone Number](https://qrcodefyi.com/type/phone/) - [Geographic Location](https://qrcodefyi.com/type/geo/) - [Calendar Event](https://qrcodefyi.com/type/calendar/) - [Bitcoin Payment](https://qrcodefyi.com/type/bitcoin/) - [WhatsApp Message](https://qrcodefyi.com/type/whatsapp/) - [App Store Link](https://qrcodefyi.com/type/app-store/) - [Social Media Profile](https://qrcodefyi.com/type/social-media/) - [PDF File Link](https://qrcodefyi.com/type/pdf/) ## Encoding Modes - [Numeric](https://qrcodefyi.com/encoding/numeric/) - [Alphanumeric](https://qrcodefyi.com/encoding/alphanumeric/) - [Byte](https://qrcodefyi.com/encoding/byte/) - [Kanji](https://qrcodefyi.com/encoding/kanji/) - [ECI (Extended Channel Interpretation)](https://qrcodefyi.com/encoding/eci/) ## Standards - [ISO/IEC 18004:2015](https://qrcodefyi.com/standard/iso-18004/) - [ISO/IEC 23941:2022](https://qrcodefyi.com/standard/iso-23941/) - [JIS X 0510:2018](https://qrcodefyi.com/standard/jis-x-0510/) - [AIM ITS/QR Code](https://qrcodefyi.com/standard/ais-qr/) - [GS1 Digital Link 1.3](https://qrcodefyi.com/standard/gs1-digital-link/) - [ISO/IEC 22762:2022](https://qrcodefyi.com/standard/iso-22762/) - [EMV QR Code Specification](https://qrcodefyi.com/standard/emv-qr/) - [SQRC Specification](https://qrcodefyi.com/standard/sqrc/) ## Glossary - [1994 Invention](https://qrcodefyi.com/glossary/1994-invention/) - [1D Barcode](https://qrcodefyi.com/glossary/1d-barcode/) - [2D Barcode](https://qrcodefyi.com/glossary/2d-barcode/) - [A/B Testing QR](https://qrcodefyi.com/glossary/ab-testing-qr/) - [Alignment Pattern](https://qrcodefyi.com/glossary/alignment-pattern/) - [Alphanumeric Mode](https://qrcodefyi.com/glossary/alphanumeric-mode/) - [Artistic QR Code](https://qrcodefyi.com/glossary/artistic-qr/) - [Aztec Code](https://qrcodefyi.com/glossary/aztec-code/) - [Batch QR Generation](https://qrcodefyi.com/glossary/batch-qr/) - [BCH Code](https://qrcodefyi.com/glossary/bch-code/) - [Binarisation](https://qrcodefyi.com/glossary/binarisation/) - [BIP 21](https://qrcodefyi.com/glossary/bip-21/) - [Byte Mode](https://qrcodefyi.com/glossary/byte-mode/) - [Call to Action (CTA)](https://qrcodefyi.com/glossary/cta/) - [Camera Resolution](https://qrcodefyi.com/glossary/camera-resolution/) - [CBOR](https://qrcodefyi.com/glossary/cbor/) - [Character Count Indicator](https://qrcodefyi.com/glossary/character-count-indicator/) - [Codeword](https://qrcodefyi.com/glossary/codeword/) - [Colour QR Code](https://qrcodefyi.com/glossary/colour-qr/) - [Contactless Menu](https://qrcodefyi.com/glossary/contactless-menu/) - [Contrast Ratio](https://qrcodefyi.com/glossary/contrast-ratio/) - [Coordinate System](https://qrcodefyi.com/glossary/coordinate-system/) - [CPM (Consumer-Presented Mode)](https://qrcodefyi.com/glossary/cpm/) - [Cryptographic Signature](https://qrcodefyi.com/glossary/crypto-signature/) - [Custom QR Code](https://qrcodefyi.com/glossary/custom-qr/) - [Dark Module](https://qrcodefyi.com/glossary/dark-module/) - [Data Capacity](https://qrcodefyi.com/glossary/capacity/) - [Data Matrix](https://qrcodefyi.com/glossary/data-matrix/) - [Data Privacy](https://qrcodefyi.com/glossary/data-privacy/) - [Data Region](https://qrcodefyi.com/glossary/data-region/) - [Decoding](https://qrcodefyi.com/glossary/decoding/) - [DENSO WAVE](https://qrcodefyi.com/glossary/denso-wave/) - [Device-Targeted QR](https://qrcodefyi.com/glossary/device-targeted-qr/) - [Digital Business Card](https://qrcodefyi.com/glossary/digital-business-card/) - [Distortion Correction](https://qrcodefyi.com/glossary/distortion-correction/) - [Dynamic QR Code](https://qrcodefyi.com/glossary/dynamic-qr-code/) - [ECI Mode](https://qrcodefyi.com/glossary/eci-mode/) - [EMV QR Code](https://qrcodefyi.com/glossary/emv-qr/) - [Encoding Mode](https://qrcodefyi.com/glossary/encoding-mode/) - [Error Correction Capacity](https://qrcodefyi.com/glossary/ec-capacity/) - [Error Correction Level](https://qrcodefyi.com/glossary/error-correction-level/) - [EU Digital COVID Certificate](https://qrcodefyi.com/glossary/eu-dcc/) - [Finder Pattern](https://qrcodefyi.com/glossary/finder-pattern/) - [FNC1 Mode](https://qrcodefyi.com/glossary/fnc1-mode/) - [Format Information](https://qrcodefyi.com/glossary/format-information/) - [Frame QR Code](https://qrcodefyi.com/glossary/frame-qr/) - [Galois Field](https://qrcodefyi.com/glossary/galois-field/) - [Generator Polynomial](https://qrcodefyi.com/glossary/generator-polynomial/) - [Geotargeted QR](https://qrcodefyi.com/glossary/geotargeted-qr/) - [Geo URI QR](https://qrcodefyi.com/glossary/geo-uri-qr/) - [Golay Code](https://qrcodefyi.com/glossary/golay-code/) - [Gradient QR Code](https://qrcodefyi.com/glossary/gradient-qr/) - [GS1 Digital Link](https://qrcodefyi.com/glossary/gs1-digital-link/) - [GTIN](https://qrcodefyi.com/glossary/gtin/) - [iCalendar QR](https://qrcodefyi.com/glossary/icalendar-qr/) - [Interleaving](https://qrcodefyi.com/glossary/interleaving/) - [Inverted QR Code](https://qrcodefyi.com/glossary/inverted-qr/) - [ISO 8859-1](https://qrcodefyi.com/glossary/iso-8859-1/) - [ISO/IEC 18004](https://qrcodefyi.com/glossary/iso-18004/) - [JIS X 0510](https://qrcodefyi.com/glossary/jis-x-0510/) - [Kanji Mode](https://qrcodefyi.com/glossary/kanji-mode/) - [Logo Integration](https://qrcodefyi.com/glossary/logo-integration/) - [Masahiro Hara](https://qrcodefyi.com/glossary/masahiro-hara/) - [Mask Pattern](https://qrcodefyi.com/glossary/mask-pattern/) - [MeCard](https://qrcodefyi.com/glossary/mecard/) - [Micro QR Code](https://qrcodefyi.com/glossary/micro-qr/) - [Mobile Boarding Pass](https://qrcodefyi.com/glossary/mobile-boarding-pass/) - [Mode Indicator](https://qrcodefyi.com/glossary/mode-indicator/) - [Module](https://qrcodefyi.com/glossary/module/) - [Module Size](https://qrcodefyi.com/glossary/module-size/) - [MPM (Merchant-Presented Mode)](https://qrcodefyi.com/glossary/mpm/) - [Numeric Mode](https://qrcodefyi.com/glossary/numeric-mode/) - [Open Standard](https://qrcodefyi.com/glossary/open-standard/) - [Orientation](https://qrcodefyi.com/glossary/orientation/) - [Padding Codeword](https://qrcodefyi.com/glossary/padding-codeword/) - [Penalty Score](https://qrcodefyi.com/glossary/penalty-score/) - [Print Resolution](https://qrcodefyi.com/glossary/print-resolution/) - [QR Analytics](https://qrcodefyi.com/glossary/qr-analytics/) - [QR Code Coupon](https://qrcodefyi.com/glossary/qr-coupon/) - [QR Code Expiration](https://qrcodefyi.com/glossary/qr-expiration/) - [QR Code Malware](https://qrcodefyi.com/glossary/qr-malware/) - [QR Code Payment](https://qrcodefyi.com/glossary/qr-payment/) - [QR Code Scanner](https://qrcodefyi.com/glossary/qr-scanner/) - [QRishing](https://qrcodefyi.com/glossary/qrishing/) - [QR Sticker Attack](https://qrcodefyi.com/glossary/qr-sticker-attack/) - [Quick Response](https://qrcodefyi.com/glossary/quick-response/) - [Quiet Zone](https://qrcodefyi.com/glossary/quiet-zone/) - [Rectangular Micro QR (rMQR)](https://qrcodefyi.com/glossary/rmqr/) - [Reed-Solomon Code](https://qrcodefyi.com/glossary/reed-solomon/) - [Remainder Bits](https://qrcodefyi.com/glossary/remainder-bits/) - [Rounded Modules](https://qrcodefyi.com/glossary/rounded-modules/) - [Scan Distance](https://qrcodefyi.com/glossary/scan-distance/) - [Scan Failure](https://qrcodefyi.com/glossary/scan-failure/) - [Separator](https://qrcodefyi.com/glossary/separator/) - [Shift JIS](https://qrcodefyi.com/glossary/shift-jis/) - [Short URL](https://qrcodefyi.com/glossary/short-url/) - [Smartphone QR Adoption](https://qrcodefyi.com/glossary/smartphone-adoption/) - [SQRC](https://qrcodefyi.com/glossary/sqrc/) - [Static QR Code](https://qrcodefyi.com/glossary/static-qr-code/) - [Structured Append](https://qrcodefyi.com/glossary/structured-append/) - [Supply Chain QR](https://qrcodefyi.com/glossary/supply-chain-qr/) - [SVG QR Code](https://qrcodefyi.com/glossary/svg-qr/) - [Tamper-Evident QR](https://qrcodefyi.com/glossary/tamper-evident-qr/) - [Terminator](https://qrcodefyi.com/glossary/terminator/) - [Timing Pattern](https://qrcodefyi.com/glossary/timing-pattern/) - [TOTP QR Code](https://qrcodefyi.com/glossary/totp-qr/) - [UDI (Unique Device Identification)](https://qrcodefyi.com/glossary/udi/) - [URL Preview](https://qrcodefyi.com/glossary/url-preview/) - [URL Redirect](https://qrcodefyi.com/glossary/url-redirect/) - [UTF-8](https://qrcodefyi.com/glossary/utf-8/) - [vCard](https://qrcodefyi.com/glossary/vcard/) - [Version](https://qrcodefyi.com/glossary/version/) - [Version Information](https://qrcodefyi.com/glossary/version-information/) - [Watermarking](https://qrcodefyi.com/glossary/watermarking/) - [WiFi QR Code](https://qrcodefyi.com/glossary/wifi-qr/) - [Zigzag Pattern](https://qrcodefyi.com/glossary/zigzag-pattern/) ## Guides - [Adding Your Logo to a QR Code Safely](https://qrcodefyi.com/guide/logo-in-qr-code/) - [Anti-Counterfeiting with QR Codes](https://qrcodefyi.com/guide/anti-counterfeiting-qr/) - [App Store QR Codes: Cross-Platform Download Links](https://qrcodefyi.com/guide/app-store-qr-codes/) - [Artistic and AI-Generated QR Codes](https://qrcodefyi.com/guide/artistic-qr-codes/) - [Avoiding Common QR Code Mistakes](https://qrcodefyi.com/guide/common-mistakes/) - [Batch Dynamic QR Code Generation](https://qrcodefyi.com/guide/batch-dynamic-generation/) - [Batch QR Code Generation via API](https://qrcodefyi.com/guide/batch-api-generation/) - [BCH and Golay Codes in Format and Version Information](https://qrcodefyi.com/guide/bch-golay-codes/) - [Bitcoin Payment QR Codes: BIP 21 URI Guide](https://qrcodefyi.com/guide/bitcoin-qr-codes/) - [Building a QR Code Shortener Service](https://qrcodefyi.com/guide/build-qr-shortener/) - [Calendar Event QR Codes: Add Events With a Scan](https://qrcodefyi.com/guide/calendar-qr-codes/) - [Choosing the Right Error Correction Level](https://qrcodefyi.com/guide/choosing-ec-level/) - [Client-Side QR Code Generation and Scanning](https://qrcodefyi.com/guide/client-side-generation/) - [Codeword Structure and Interleaving](https://qrcodefyi.com/guide/codeword-interleaving/) - [Cross-Border QR Payments: The Interoperability Challenge](https://qrcodefyi.com/guide/cross-border-qr-payments/) - [Cryptographic Signatures in QR Codes](https://qrcodefyi.com/guide/qr-cryptographic-signatures/) - [Dark Mode QR Codes for Digital Displays](https://qrcodefyi.com/guide/dark-mode-qr-codes/) - [Data Capacity vs Error Correction Trade-offs](https://qrcodefyi.com/guide/capacity-ec-tradeoffs/) - [Data Protection (GDPR) and QR Codes](https://qrcodefyi.com/guide/gdpr-qr-codes/) - [Designing QR Codes for Business Cards](https://qrcodefyi.com/guide/qr-code-business-cards/) - [Device-Targeted QR Codes: iOS vs Android Routing](https://qrcodefyi.com/guide/device-targeted-qr-guide/) - [Dynamic QR Code A/B Testing](https://qrcodefyi.com/guide/dynamic-ab-testing/) - [Dynamic QR Code API Integration](https://qrcodefyi.com/guide/api-integration/) - [Dynamic QR Code Costs: Free vs Paid vs Self-Hosted](https://qrcodefyi.com/guide/dynamic-qr-costs/) - [Dynamic QR Code Platforms Compared](https://qrcodefyi.com/guide/dynamic-platforms-compared/) - [Dynamic QR Codes Explained: How URL Redirection Works](https://qrcodefyi.com/guide/dynamic-qr-explained/) - [Dynamic QR Codes for Personalised Marketing](https://qrcodefyi.com/guide/personalised-marketing-qr/) - [Email QR Codes: Pre-filled Messages on Scan](https://qrcodefyi.com/guide/email-qr-codes/) - [Encoding Modes: Numeric, Alphanumeric, Byte, Kanji, and ECI](https://qrcodefyi.com/guide/encoding-modes-explained/) - [Error Correction and Logo Placement: How Much Can You Cover?](https://qrcodefyi.com/guide/ec-logo-placement/) - [Error Correction for Harsh Environments](https://qrcodefyi.com/guide/ec-harsh-environments/) - [Error Correction in Micro QR and rMQR](https://qrcodefyi.com/guide/ec-micro-qr-rmqr/) - [Error Correction Levels L, M, Q, H: How to Choose](https://qrcodefyi.com/guide/error-correction-levels/) - [EU Digital COVID Certificate: QR Code Case Study](https://qrcodefyi.com/guide/eu-dcc-case-study/) - [Future of QR Error Correction: Colored QR and Beyond](https://qrcodefyi.com/guide/future-error-correction/) - [Generating QR Codes in JavaScript](https://qrcodefyi.com/guide/javascript-qr-generation/) - [Generating QR Codes in Python](https://qrcodefyi.com/guide/python-qr-generation/) - [Geographic Location QR Codes: Share Coordinates](https://qrcodefyi.com/guide/geo-location-qr-codes/) - [Geotargeted QR Codes: Location-Based Routing](https://qrcodefyi.com/guide/geotargeted-qr-guide/) - [How Much Damage Can a QR Code Survive?](https://qrcodefyi.com/guide/qr-damage-tolerance/) - [How QR Code Scanning Works: From Camera to Data](https://qrcodefyi.com/guide/how-scanning-works/) - [How Scanners Handle Errors: Decode Algorithm Walkthrough](https://qrcodefyi.com/guide/decode-algorithm/) - [Inverted QR Codes: White on Dark Backgrounds](https://qrcodefyi.com/guide/inverted-qr-codes/) - [Mask Patterns: The Hidden Optimisation in Every QR Code](https://qrcodefyi.com/guide/mask-patterns-explained/) - [Measuring QR Code ROI: Metrics That Matter](https://qrcodefyi.com/guide/qr-code-roi/) - [MeCard vs vCard: Which Contact Format to Choose](https://qrcodefyi.com/guide/mecard-vs-vcard/) - [Micro QR and rMQR: Compact Alternatives to Standard QR](https://qrcodefyi.com/guide/micro-qr-rmqr/) - [Migrating Static QR Codes to Dynamic](https://qrcodefyi.com/guide/migrate-static-to-dynamic/) - [PDF QR Codes: Link to Documents](https://qrcodefyi.com/guide/pdf-qr-codes/) - [Phone Number QR Codes: One-Tap Calling](https://qrcodefyi.com/guide/phone-qr-codes/) - [Plain Text QR Codes: Serial Numbers, Messages, and Raw Data](https://qrcodefyi.com/guide/plain-text-qr-codes/) - [Print Quality and Error Correction: ISO 15415 Grading](https://qrcodefyi.com/guide/print-quality-grading/) - [Privacy Risks of QR Codes: What Scanners Reveal](https://qrcodefyi.com/guide/privacy-risks/) - [QR Code A/B Testing: Optimise Your Campaigns](https://qrcodefyi.com/guide/ab-testing-qr-codes/) - [QR Code Accessibility: WCAG and Inclusive Design](https://qrcodefyi.com/guide/accessibility-guide/) - [QR Code Analytics: What You Can Track](https://qrcodefyi.com/guide/analytics-guide/) - [QR Code Anatomy: Every Component Explained](https://qrcodefyi.com/guide/qr-code-anatomy/) - [QR Code Call-to-Action: Getting People to Actually Scan](https://qrcodefyi.com/guide/qr-call-to-action/) - [QR Code Colour Guide: Beyond Black and White](https://qrcodefyi.com/guide/qr-code-colours/) - [QR Code Data Capacity: Maximum Characters by Version and Mode](https://qrcodefyi.com/guide/data-capacity-reference/) - [QR Code Deployment Checklist](https://qrcodefyi.com/guide/deployment-checklist/) - [QR Code Design Best Practices](https://qrcodefyi.com/guide/design-best-practices/) - [QR Code Design Tools: Free and Paid Options Compared](https://qrcodefyi.com/guide/design-tools-comparison/) - [QR Code Encoding Algorithm: Step-by-Step Implementation](https://qrcodefyi.com/guide/encoding-algorithm/) - [QR Code Expiration and Access Control](https://qrcodefyi.com/guide/expiration-access-control/) - [QR Code Frames and Borders](https://qrcodefyi.com/guide/frames-and-borders/) - [QR Code Generation in CI/CD Pipelines](https://qrcodefyi.com/guide/ci-cd-qr-generation/) - [QR Code Generation Libraries: Python, JavaScript, and More](https://qrcodefyi.com/guide/generation-libraries/) - [QR Code Generation with Custom Design: Developer Guide](https://qrcodefyi.com/guide/custom-design-dev/) - [QR Code Incident Response: When Things Go Wrong](https://qrcodefyi.com/guide/incident-response/) - [QR Code Link Rot: Prevention and Monitoring](https://qrcodefyi.com/guide/link-rot-prevention/) - [QR Code Maintenance: Keeping Codes Working Long-Term](https://qrcodefyi.com/guide/maintenance-guide/) - [QR Code Malware: Threats and Mitigation](https://qrcodefyi.com/guide/qr-malware-threats/) - [QR Code Material Selection: From Paper to Metal](https://qrcodefyi.com/guide/material-selection/) - [QR Code Payment Standards by Country](https://qrcodefyi.com/guide/payment-standards-country/) - [QR Code Performance: Generation and Scanning Speed](https://qrcodefyi.com/guide/performance-optimization/) - [QR Code Placement Strategy: Where to Put Your Codes](https://qrcodefyi.com/guide/placement-strategy/) - [QR Code Printing: Paper, Ink, and Resolution](https://qrcodefyi.com/guide/printing-guide/) - [QR Code Quiet Zone: The Most Ignored Requirement](https://qrcodefyi.com/guide/quiet-zone-guide/) - [QR Code Reading and Decoding in Code](https://qrcodefyi.com/guide/reading-decoding-code/) - [QR Code Regulations and Legal Considerations](https://qrcodefyi.com/guide/regulations-legal/) - [QR Codes and Accessibility APIs](https://qrcodefyi.com/guide/accessibility-api/) - [QR Code Security Audit Checklist](https://qrcodefyi.com/guide/security-audit-checklist/) - [QR Code Security for Enterprise Deployment](https://qrcodefyi.com/guide/enterprise-security/) - [QR Codes for Business Cards: The Digital Networking Guide](https://qrcodefyi.com/guide/business-card-networking/) - [QR Codes for Coupons and Promotions](https://qrcodefyi.com/guide/coupon-promotion-qr/) - [QR Codes for Customer Feedback and Reviews](https://qrcodefyi.com/guide/feedback-reviews-qr/) - [QR Codes for Education and Training](https://qrcodefyi.com/guide/education-qr-codes/) - [QR Codes for Events: Registration to Follow-Up](https://qrcodefyi.com/guide/event-qr-codes/) - [QR Codes for Large Format: Billboards, Banners, and Signage](https://qrcodefyi.com/guide/large-format-qr/) - [QR Codes for Loyalty Programs](https://qrcodefyi.com/guide/loyalty-program-qr/) - [QR Codes for Product Packaging Design](https://qrcodefyi.com/guide/packaging-design/) - [QR Codes for Real Estate: Listings and Virtual Tours](https://qrcodefyi.com/guide/real-estate-qr/) - [QR Codes for Restaurants: Beyond the Menu](https://qrcodefyi.com/guide/restaurant-qr-codes/) - [QR Codes for Retail: In-Store and E-Commerce](https://qrcodefyi.com/guide/retail-qr-codes/) - [QR Codes for Screen Display: TVs, Monitors, and Projectors](https://qrcodefyi.com/guide/screen-display-guide/) - [QR Codes for Two-Factor Authentication (2FA)](https://qrcodefyi.com/guide/2fa-qr-codes/) - [QR Codes in Africa: M-Pesa and Mobile-First Markets](https://qrcodefyi.com/guide/qr-codes-africa/) - [QR Codes in Brazil: Pix and Financial Revolution](https://qrcodefyi.com/guide/qr-codes-brazil/) - [QR Codes in China: Mobile Payments and Beyond](https://qrcodefyi.com/guide/qr-codes-china/) - [QR Codes in Emails: When and How](https://qrcodefyi.com/guide/email-qr-codes-guide/) - [QR Codes in Europe: GDPR, Health Passes, and Payments](https://qrcodefyi.com/guide/qr-codes-europe/) - [QR Codes in Government Services Worldwide](https://qrcodefyi.com/guide/government-qr-global/) - [QR Codes in Healthcare: Global Implementations](https://qrcodefyi.com/guide/qr-healthcare-global/) - [QR Codes in India: UPI and Digital India](https://qrcodefyi.com/guide/qr-codes-india/) - [QR Codes in Japan: Where It All Began](https://qrcodefyi.com/guide/qr-codes-japan/) - [QR Codes in Low-Light and Outdoor Environments](https://qrcodefyi.com/guide/low-light-outdoor/) - [QR Codes in Marketing: Strategy and Best Practices](https://qrcodefyi.com/guide/marketing-strategy/) - [QR Codes in Mobile Apps: Native Generation and Scanning](https://qrcodefyi.com/guide/mobile-app-qr/) - [QR Codes in Southeast Asia: GrabPay, GoPay, and More](https://qrcodefyi.com/guide/qr-codes-southeast-asia/) - [QR Codes in South Korea: KakaoTalk and Smart Cities](https://qrcodefyi.com/guide/qr-codes-korea/) - [QR Codes in the United States: From Skepticism to Mainstream](https://qrcodefyi.com/guide/qr-codes-usa/) - [QR Code Size Calculator: Print Size for Every Distance](https://qrcodefyi.com/guide/size-calculator-guide/) - [QR Code Sizing: Minimum Size for Every Distance](https://qrcodefyi.com/guide/sizing-guide/) - [QR Codes on Curved Surfaces](https://qrcodefyi.com/guide/curved-surfaces/) - [QR Codes on Print Advertising](https://qrcodefyi.com/guide/print-advertising-qr/) - [QR Code Standards: ISO 18004 and Beyond](https://qrcodefyi.com/guide/qr-code-standards/) - [QR Code Sticker Attacks: Detection and Prevention](https://qrcodefyi.com/guide/sticker-attack-prevention/) - [QR Code URL Shortening: When and How](https://qrcodefyi.com/guide/url-shortening/) - [QR Code Versions 1-40: Size, Capacity, and Selection](https://qrcodefyi.com/guide/qr-code-versions/) - [QR Code Version Selection: Balancing Size and Data](https://qrcodefyi.com/guide/version-selection-guide/) - [QR Code vs Barcode: Why 2D Won](https://qrcodefyi.com/guide/qr-code-vs-barcode/) - [QRishing: How QR Code Phishing Works](https://qrcodefyi.com/guide/qrishing-explained/) - [Reed-Solomon Codes: The Math Behind QR Error Correction](https://qrcodefyi.com/guide/reed-solomon-math/) - [Reed-Solomon Error Correction in QR Codes](https://qrcodefyi.com/guide/reed-solomon-explained/) - [Rounded and Circular Module Styles](https://qrcodefyi.com/guide/rounded-module-styles/) - [Safe QR Code Scanning: A Consumer Guide](https://qrcodefyi.com/guide/safe-scanning-guide/) - [Secure QR Code Generation: Best Practices for Developers](https://qrcodefyi.com/guide/secure-generation/) - [Self-Hosted Dynamic QR Codes: DIY Guide](https://qrcodefyi.com/guide/self-hosted-dynamic-qr/) - [Server-Side QR Code Generation for Web Apps](https://qrcodefyi.com/guide/server-side-generation/) - [Setting Up Custom Domains for Dynamic QR Codes](https://qrcodefyi.com/guide/custom-domains-qr/) - [SMS QR Codes: One-Tap Messaging](https://qrcodefyi.com/guide/sms-qr-codes/) - [Social Media QR Codes: Profile and Channel Links](https://qrcodefyi.com/guide/social-media-qr-codes/) - [SQRC: Secure QR Codes with Encrypted Data](https://qrcodefyi.com/guide/sqrc-secure-qr/) - [Static vs Dynamic QR Codes: Pros, Cons, and When to Use Each](https://qrcodefyi.com/guide/static-vs-dynamic/) - [Structured Append: Splitting Data Across Multiple QR Codes](https://qrcodefyi.com/guide/structured-append/) - [SVG vs PNG vs PDF: QR Code Export Formats](https://qrcodefyi.com/guide/export-formats/) - [Testing QR Code Error Correction: Practical Experiments](https://qrcodefyi.com/guide/testing-error-correction/) - [Testing QR Code Generation: Unit and Integration Tests](https://qrcodefyi.com/guide/testing-qr-generation/) - [Testing QR Codes: A Complete Verification Guide](https://qrcodefyi.com/guide/testing-guide/) - [The Finder Pattern: Why QR Codes Have Three Squares](https://qrcodefyi.com/guide/finder-pattern-deep-dive/) - [The Future of QR Codes: Trends and Predictions](https://qrcodefyi.com/guide/future-of-qr-codes/) - [The History of QR Codes: From Toyota to Global Standard](https://qrcodefyi.com/guide/history-of-qr-codes/) - [URL QR Codes: The Complete Guide](https://qrcodefyi.com/guide/url-qr-codes/) - [UTM Tracking with QR Codes: Measure Every Scan](https://qrcodefyi.com/guide/utm-tracking-qr/) - [vCard QR Codes: Digital Business Cards That Work](https://qrcodefyi.com/guide/vcard-qr-codes/) - [What Is a QR Code? A Complete Introduction](https://qrcodefyi.com/guide/what-is-a-qr-code/) - [WhatsApp QR Codes: Start Conversations Instantly](https://qrcodefyi.com/guide/whatsapp-qr-codes/) - [When Error Correction Fails: Debugging Unreadable QR Codes](https://qrcodefyi.com/guide/debugging-unreadable-qr/) - [WiFi QR Codes: Share Network Credentials Instantly](https://qrcodefyi.com/guide/wifi-qr-codes/) ## Interactive Tools - [Batch QR Code Generator](https://qrcodefyi.com/tools/batch-generator/) - [QR Code Capacity Calculator](https://qrcodefyi.com/tools/capacity-calculator/) - [QR Code Comparison Tool](https://qrcodefyi.com/tools/qr-comparison/) - [QR Code Data Encoder/Decoder](https://qrcodefyi.com/tools/data-encoder/) - [QR Code Generator](https://qrcodefyi.com/tools/qr-generator/) - [QR Code Reader](https://qrcodefyi.com/tools/qr-reader/) - [QR Code Size Calculator](https://qrcodefyi.com/tools/size-calculator/) - [QR Code Validator](https://qrcodefyi.com/tools/qr-validator/) - [vCard QR Code Generator](https://qrcodefyi.com/tools/vcard-generator/) - [WiFi QR Code Generator](https://qrcodefyi.com/tools/wifi-generator/) ## Comparisons - [Alphanumeric vs Byte Encoding Mode](https://qrcodefyi.com/compare/alphanumeric-vs-byte-mode/) - [Bitcoin QR Code vs URL QR Code](https://qrcodefyi.com/compare/bitcoin-vs-url/) - [Byte vs Kanji Encoding Mode](https://qrcodefyi.com/compare/byte-vs-kanji-mode/) - [Calendar Event QR Code vs URL QR Code](https://qrcodefyi.com/compare/calendar-vs-url/) - [Email QR Code vs SMS QR Code](https://qrcodefyi.com/compare/email-vs-sms/) - [Geo Location QR Code vs URL QR Code](https://qrcodefyi.com/compare/geo-vs-url/) - [Numeric vs Alphanumeric Encoding Mode](https://qrcodefyi.com/compare/numeric-vs-alphanumeric-mode/) - [Phone Call QR Code vs SMS QR Code](https://qrcodefyi.com/compare/phone-vs-sms/) - [QR Code EC Level L vs Level H](https://qrcodefyi.com/compare/ec-level-l-vs-h/) - [QR Code EC Level M vs Level Q](https://qrcodefyi.com/compare/ec-level-m-vs-q/) - [QR Code for Business Card vs QR Code for Poster](https://qrcodefyi.com/compare/business-card-vs-poster/) - [QR Code for Marketing vs QR Code for Payments](https://qrcodefyi.com/compare/marketing-vs-payments/) - [QR Code for Print vs QR Code for Screen](https://qrcodefyi.com/compare/print-vs-screen/) - [QR Code PNG vs SVG Export](https://qrcodefyi.com/compare/png-vs-svg-export/) - [QR Code vs Aztec Code](https://qrcodefyi.com/compare/qr-code-vs-aztec/) - [QR Code vs Data Matrix](https://qrcodefyi.com/compare/qr-code-vs-data-matrix/) - [QR Code vs Micro QR Code](https://qrcodefyi.com/compare/qr-code-vs-micro-qr/) - [QR Code vs PDF417](https://qrcodefyi.com/compare/qr-code-vs-pdf417/) - [QR Code vs rMQR Code](https://qrcodefyi.com/compare/qr-code-vs-rmqr/) - [Static QR Code vs Dynamic QR Code](https://qrcodefyi.com/compare/static-vs-dynamic/) - [URL QR Code vs Plain Text QR Code](https://qrcodefyi.com/compare/url-vs-text/) - [vCard QR Code vs MeCard QR Code](https://qrcodefyi.com/compare/vcard-vs-mecard/) - [WiFi QR Code vs URL QR Code](https://qrcodefyi.com/compare/wifi-vs-url/) - [WiFi QR: WPA2 vs WPA3](https://qrcodefyi.com/compare/wifi-wpa2-vs-wpa3/) ## Full Index - [XML Sitemap](https://qrcodefyi.com/sitemap.xml)