# BarcodeFYI — Full Reference

> The world's most comprehensive barcode encyclopedia and toolkit.
> 30 barcode symbologies with full technical specifications.

## Markdown Endpoints

Every content page supports `.md` suffix for LLM-friendly markdown.
Append `.md` to any URL path (e.g., `/symbology/ean-13.md`).

## Symbologies (30)
- [UPC-A](https://barcodefyi.com/symbology/upc-a/.md): UPC-A barcode — the 12-digit product code that started retail scanning in 1974. Technical specs, check digit algorithm, and usage guide.
- [UPC-E](https://barcodefyi.com/symbology/upc-e/.md): UPC-E barcode — the zero-suppressed compact version of UPC-A for small retail products. Encoding rules and conversion guide.
- [EAN-13](https://barcodefyi.com/symbology/ean-13/.md): EAN-13 barcode — the 13-digit global retail product code used in 100+ countries. Specs, GS1 prefix lookup, and check digit calculation.
- [EAN-8](https://barcodefyi.com/symbology/ean-8/.md): EAN-8 barcode — the compact 8-digit variant for small products. When to use it, how to apply for one, and technical specifications.
- [EAN-5 Supplement](https://barcodefyi.com/symbology/ean-5/.md): EAN-5 supplement barcode — the 5-digit add-on for book and periodical pricing alongside ISBN and ISSN barcodes.
- [EAN-2 Supplement](https://barcodefyi.com/symbology/ean-2/.md): EAN-2 supplement barcode — the 2-digit add-on for magazine and newspaper issue number identification.
- [ISBN (Bookland)](https://barcodefyi.com/symbology/isbn/.md): ISBN barcode — the international book identifier encoded as EAN-13 with 978/979 prefix. ISBN-10 to ISBN-13 conversion guide.
- [ISSN](https://barcodefyi.com/symbology/issn/.md): ISSN barcode — the serial publication identifier encoded as EAN-13 with 977 prefix for journals, magazines, and newspapers.
- [Code 39](https://barcodefyi.com/symbology/code-39/.md): Code 39 barcode — the first alphanumeric symbology, self-checking and widely used in defense, automotive, and healthcare since 1974.
- [Code 93](https://barcodefyi.com/symbology/code-93/.md): Code 93 barcode — a denser alternative to Code 39 with full ASCII support and dual check characters for enhanced reliability.
- [Code 128](https://barcodefyi.com/symbology/code-128/.md): Code 128 barcode — the highest-density linear symbology with full ASCII support and three switchable character sets.
- [Codabar (NW-7)](https://barcodefyi.com/symbology/codabar/.md): Codabar barcode — a self-checking symbology used in blood banking, libraries, and FedEx since 1972.
- [ITF-14](https://barcodefyi.com/symbology/itf-14/.md): ITF-14 barcode — the 14-digit standard for shipping cartons and cases with bearer bars for reliable corrugated cardboard scanning.
- [Interleaved 2 of 5](https://barcodefyi.com/symbology/itf/.md): Interleaved 2 of 5 barcode — high-density numeric encoding using dual-digit interleaving for warehouse and distribution labels.
- [GS1-128](https://barcodefyi.com/symbology/gs1-128/.md): GS1-128 barcode — the supply chain standard encoding batch, expiry, and serial data with Application Identifiers.
- [GS1 DataBar](https://barcodefyi.com/symbology/gs1-databar/.md): GS1 DataBar — a compact barcode for small items encoding full 14-digit GTINs in less space than EAN-13.
- [GS1 DataBar Expanded](https://barcodefyi.com/symbology/gs1-databar-expanded/.md): GS1 DataBar Expanded — variable-length barcode with Application Identifiers for weight, price, and expiry at point of sale.
- [MSI Plessey](https://barcodefyi.com/symbology/msi-plessey/.md): MSI Plessey barcode — a numeric symbology for supermarket shelf labels and inventory control with flexible check digit options.
- [Pharmacode](https://barcodefyi.com/symbology/pharmacode/.md): Pharmacode barcode — a pharmaceutical packaging verification code encoding a single integer in binary bar patterns.
- [POSTNET](https://barcodefyi.com/symbology/postnet/.md): POSTNET barcode — the USPS height-modulated ZIP code encoding system for automated mail sorting, active 1983-2013.
- [Intelligent Mail](https://barcodefyi.com/symbology/intelligent-mail/.md): Intelligent Mail barcode — the current USPS 65-bar symbol encoding both routing and tracking for end-to-end mail visibility.
- [Data Matrix](https://barcodefyi.com/symbology/data-matrix/.md): Data Matrix barcode — a 2D matrix code storing 2,335+ characters with error correction for direct part marking and industrial use.
- [PDF417](https://barcodefyi.com/symbology/pdf417/.md): PDF417 barcode — a stacked symbology encoding 1,850+ characters, standard for driver's licenses and boarding passes.
- [Aztec Code](https://barcodefyi.com/symbology/aztec/.md): Aztec Code — a 2D barcode with a bull's-eye finder pattern, no quiet zone required, standard for airline and rail tickets.
- [MaxiCode](https://barcodefyi.com/symbology/maxicode/.md): MaxiCode — UPS's fixed-size hexagonal 2D barcode for high-speed package sorting on conveyor systems.
- [DotCode](https://barcodefyi.com/symbology/dotcode/.md): DotCode — a 2D barcode optimized for high-speed industrial inkjet and laser printing on production lines.
- [Han Xin Code](https://barcodefyi.com/symbology/han-xin/.md): Han Xin Code — a Chinese 2D matrix barcode supporting GB 18030 CJK characters, ASCII, and binary data encoding.
- [GS1 DataMatrix](https://barcodefyi.com/symbology/gs1-datamatrix/.md): GS1 DataMatrix — the 2D barcode for pharmaceutical serialization and medical device UDI with GS1 Application Identifiers.
- [Micro PDF417](https://barcodefyi.com/symbology/micro-pdf417/.md): Micro PDF417 — a compact stacked barcode for small labels where linear codes lack capacity and full PDF417 is too large.
- [GS1 Composite](https://barcodefyi.com/symbology/composite/.md): GS1 Composite — a hybrid 1D+2D barcode providing legacy compatibility with extended GS1 Application Identifier data.

## Guides (150)
- [1D vs 2D Barcodes: Key Differences Explained](https://barcodefyi.com/guide/1d-vs-2d-barcodes/.md)
- [3PL Barcode Standards: Meeting Client Requirements](https://barcodefyi.com/guide/3pl-barcode-standards/.md)
- [50 Years of Barcodes: A Timeline of Key Milestones](https://barcodefyi.com/guide/50-years-barcode-timeline/.md)
- [Age-Restricted Products: Barcode Compliance for Alcohol & Tobacco](https://barcodefyi.com/guide/age-restricted-barcode-compliance/.md)
- [Anti-Counterfeiting in Pharma: Serialization & Authentication](https://barcodefyi.com/guide/pharma-anti-counterfeiting/.md)
- [Augmented Reality & Barcodes: Product Visualization](https://barcodefyi.com/guide/ar-barcodes-visualization/.md)
- [Automated Sortation with Barcode Scanning](https://barcodefyi.com/guide/automated-sortation-barcodes/.md)
- [Aztec Code: The Barcode Inside Your Boarding Pass](https://barcodefyi.com/guide/aztec-code-deep-dive/.md)
- [Barcode Accessibility: Screen Readers & Inclusive Design](https://barcodefyi.com/guide/barcode-accessibility/.md)
- [Barcode Anatomy: Bars, Spaces, Quiet Zones & Check Digits](https://barcodefyi.com/guide/barcode-anatomy/.md)
- [Barcode Art: When Identification Becomes Creative Expression](https://barcodefyi.com/guide/barcode-art/.md)
- [Barcode-Based Authentication & 2FA](https://barcodefyi.com/guide/barcode-authentication-2fa/.md)
- [Barcode Color Contrast: Which Colors Scan & Which Don't](https://barcodefyi.com/guide/barcode-color-contrast/.md)
- [Barcode Data Capacity: How Much Can Each Format Store?](https://barcodefyi.com/guide/barcode-data-capacity/.md)
- [Barcode Data Security: Encryption & Tamper Detection](https://barcodefyi.com/guide/barcode-data-security/.md)
- [Barcode Generation APIs: Building Server-Side Barcode Services](https://barcodefyi.com/guide/barcode-generation-apis/.md)
- [Barcode Label Design Software: Tools & Best Practices](https://barcodefyi.com/guide/barcode-label-design-software/.md)
- [Barcode Label Printing for Retail: In-Store & Vendor](https://barcodefyi.com/guide/retail-barcode-label-printing/.md)
- [Barcode Master Data: GDSN & Product Data Synchronization](https://barcodefyi.com/guide/gdsn-product-data-sync/.md)
- [Barcode Number Systems: GTIN, UPC, EAN & ISBN](https://barcodefyi.com/guide/barcode-number-systems/.md)
- [Barcode Performance Optimization: Latency & Throughput](https://barcodefyi.com/guide/barcode-performance-optimization/.md)
- [Barcode Quality Audits: Setting Up a QA Process](https://barcodefyi.com/guide/barcode-quality-audits/.md)
- [Barcode Scanner Configuration: Prefixes, Suffixes & Parsing](https://barcodefyi.com/guide/scanner-configuration-parsing/.md)
- [Barcode Scanner Hardware for Retail: Buyer's Guide](https://barcodefyi.com/guide/retail-scanner-buyers-guide/.md)
- [Barcode Scanning in iOS & Android: Native Development](https://barcodefyi.com/guide/barcode-scanning-native-mobile/.md)
- [Barcode Scanning in Progressive Web Apps (PWA)](https://barcodefyi.com/guide/barcode-scanning-pwa/.md)
- [Barcodes in Space: NASA, ESA & Satellite Tracking](https://barcodefyi.com/guide/barcodes-in-space/.md)
- [Barcode Size & Magnification: Getting the Dimensions Right](https://barcodefyi.com/guide/barcode-size-magnification/.md)
- [Barcode Substrate Guide: Paper, Polyester, Polypropylene & More](https://barcodefyi.com/guide/barcode-substrate-guide/.md)
- [Barcode System Architecture: From Scanner to Database](https://barcodefyi.com/guide/barcode-system-architecture/.md)
- [Barcode Validation & Error Handling in Software](https://barcodefyi.com/guide/barcode-validation-software/.md)
- [Barcode Verifier vs Scanner: Why You Need Both](https://barcodefyi.com/guide/barcode-verifier-vs-scanner/.md)
- [Barcode vs RFID: When to Use Each Technology](https://barcodefyi.com/guide/barcode-vs-rfid/.md)
- [Barcode Web Services: REST, GraphQL & Webhook Patterns](https://barcodefyi.com/guide/barcode-web-services/.md)
- [Batch Barcode Processing: CSV Import & Bulk Generation](https://barcodefyi.com/guide/batch-barcode-processing/.md)
- [Blockchain & Barcodes: Decentralized Product Traceability](https://barcodefyi.com/guide/blockchain-barcode-traceability/.md)
- [Blood Bank Barcodes: ISBT 128 & Transfusion Safety](https://barcodefyi.com/guide/blood-bank-isbt-128/.md)
- [Character Encoding in Barcodes: Numeric, Alpha & Binary](https://barcodefyi.com/guide/character-encoding-barcodes/.md)
- [Check Digit Algorithms: How Barcodes Prevent Errors](https://barcodefyi.com/guide/check-digit-algorithms-guide/.md)
- [Choosing the Right Barcode Format for Your Project](https://barcodefyi.com/guide/choosing-barcode-format/.md)
- [Clinical Trial Barcodes: Blinding & Randomization Labels](https://barcodefyi.com/guide/clinical-trial-barcodes/.md)
- [Codabar: The Legacy Barcode in Blood Banks & Libraries](https://barcodefyi.com/guide/codabar-deep-dive/.md)
- [Code 128: The Swiss Army Knife of 1D Barcodes](https://barcodefyi.com/guide/code-128-deep-dive/.md)
- [Code 39 Explained: The Self-Checking Alphanumeric Barcode](https://barcodefyi.com/guide/code-39-explained/.md)
- [Cold Chain Logistics Barcodes: Frozen & Refrigerated Goods](https://barcodefyi.com/guide/cold-chain-logistics-barcodes/.md)
- [Composite Barcodes: Linking 1D and 2D in One Symbol](https://barcodefyi.com/guide/composite-barcodes-guide/.md)
- [Computer Vision & Barcodes: AI-Powered Reading](https://barcodefyi.com/guide/computer-vision-barcodes/.md)
- [Contactless Menus & QR Code Ordering Systems](https://barcodefyi.com/guide/contactless-qr-menus/.md)
- [Coupon Barcodes: GS1 DataBar & Digital Redemption](https://barcodefyi.com/guide/coupon-barcodes/.md)
- [Cross-Docking with Barcodes: Zero-Inventory Logistics](https://barcodefyi.com/guide/cross-docking-barcodes/.md)
- [Database Design for Barcode Data: Schema Patterns](https://barcodefyi.com/guide/database-design-barcode-data/.md)
- [Data Matrix: High-Density 2D for Manufacturing](https://barcodefyi.com/guide/data-matrix-deep-dive/.md)
- [Digital Business Cards: vCard QR Codes](https://barcodefyi.com/guide/vcard-qr-codes/.md)
- [Digital Coupons & Barcode-Based Loyalty Programs](https://barcodefyi.com/guide/digital-coupons-loyalty/.md)
- [Digital Receipts with Barcode Lookup](https://barcodefyi.com/guide/digital-receipts-barcode/.md)
- [Direct Part Marking: Barcodes on Metal, Glass & Plastic](https://barcodefyi.com/guide/direct-part-marking-guide/.md)
- [Dock Door & Yard Management Barcodes](https://barcodefyi.com/guide/dock-door-yard-barcodes/.md)
- [DSCSA Drug Serialization: Barcode Requirements for Pharma](https://barcodefyi.com/guide/dscsa-drug-serialization/.md)
- [Dynamic QR Codes: Short URLs & Real-Time Analytics](https://barcodefyi.com/guide/dynamic-qr-codes/.md)
- [EAN-13 Deep Dive: The World's Most Scanned Barcode](https://barcodefyi.com/guide/ean-13-deep-dive/.md)
- [EDI & Barcodes: Automating Purchase Orders with ASN](https://barcodefyi.com/guide/edi-barcodes-asn/.md)
- [ERP Barcode Integration: SAP, Oracle & Microsoft Dynamics](https://barcodefyi.com/guide/erp-barcode-integration/.md)
- [Error Correction in 2D Barcodes: Reed-Solomon & Beyond](https://barcodefyi.com/guide/error-correction-2d-barcodes/.md)
- [EU MDR & IVDR: European Medical Device Barcode Regulations](https://barcodefyi.com/guide/eu-mdr-ivdr-barcodes/.md)
- [Event Ticketing Barcodes: From PDF to Mobile](https://barcodefyi.com/guide/event-ticketing-barcodes/.md)
- [FDA UDI Requirements: A Barcode Compliance Guide](https://barcodefyi.com/guide/fda-udi-compliance/.md)
- [Fixed-Length vs Variable-Length Barcodes](https://barcodefyi.com/guide/fixed-vs-variable-length/.md)
- [Fresh Produce & Deli Barcodes: PLU, Variable Weight & Price](https://barcodefyi.com/guide/produce-deli-barcodes/.md)
- [Getting Your First Barcode: A Step-by-Step Guide](https://barcodefyi.com/guide/getting-first-barcode/.md)
- [Gift Cards & Prepaid Barcodes: Activation & Redemption](https://barcodefyi.com/guide/gift-card-prepaid-barcodes/.md)
- [GLN & Location Barcodes: Identifying Places in the Supply Chain](https://barcodefyi.com/guide/gln-location-barcodes/.md)
- [GS1-128 (formerly UCC/EAN-128): The Supply Chain Workhorse](https://barcodefyi.com/guide/gs1-128-deep-dive/.md)
- [GS1-128 Label Generation: A Developer's Guide](https://barcodefyi.com/guide/gs1-128-label-generation/.md)
- [GS1 Application Identifiers: The Barcode Data Dictionary](https://barcodefyi.com/guide/gs1-application-identifiers/.md)
- [GS1 Barcodes Explained: The Global Language of Commerce](https://barcodefyi.com/guide/gs1-barcodes-explained/.md)
- [GS1 Company Prefix: Your Unique Barcode Identity](https://barcodefyi.com/guide/gs1-company-prefix/.md)
- [GS1 DataBar: Compact Barcodes for Fresh Produce & Coupons](https://barcodefyi.com/guide/gs1-databar-deep-dive/.md)
- [GS1 Digital Link: The URL-Based Barcode Revolution](https://barcodefyi.com/guide/gs1-digital-link/.md)
- [GS1 General Specifications for Symbol Production](https://barcodefyi.com/guide/gs1-symbol-production-specs/.md)
- [GS1 Prefix Allocation: How Country Codes Work](https://barcodefyi.com/guide/gs1-prefix-allocation/.md)
- [GS1 Standards for E-Commerce & Marketplace Sellers](https://barcodefyi.com/guide/gs1-ecommerce-marketplace/.md)
- [GS1 Verify & GEPIR: Validating Barcodes Online](https://barcodefyi.com/guide/gs1-verify-gepir/.md)
- [GTIN Explained: The Global Trade Item Number System](https://barcodefyi.com/guide/gtin-explained/.md)
- [Hazmat & Dangerous Goods Barcode Labels](https://barcodefyi.com/guide/hazmat-barcode-labels/.md)
- [Healthcare Barcode ROI: Measuring Safety & Efficiency Gains](https://barcodefyi.com/guide/healthcare-barcode-roi/.md)
- [Healthcare GS1 Standards: GTIN, AIDC & UDI Compliance](https://barcodefyi.com/guide/healthcare-gs1-standards/.md)
- [HIBC Barcodes: Health Industry Bar Code Standard](https://barcodefyi.com/guide/hibc-barcode-standard/.md)
- [How Barcode Scanners Work: Lasers, Imagers & Cameras](https://barcodefyi.com/guide/how-barcode-scanners-work/.md)
- [How Point-of-Sale Barcode Scanning Works](https://barcodefyi.com/guide/pos-barcode-scanning/.md)
- [How Smartphones Made QR Codes Mainstream (2010-2020)](https://barcodefyi.com/guide/smartphones-qr-codes-mainstream/.md)
- [Implant Barcodes: Tracking Devices Inside the Human Body](https://barcodefyi.com/guide/implant-barcodes-tracking/.md)
- [Inkjet & Laser Barcode Printing: What You Need to Know](https://barcodefyi.com/guide/inkjet-laser-barcode-printing/.md)
- [In-Store Barcodes: Shelf Labels, Price Tags & Loyalty Cards](https://barcodefyi.com/guide/in-store-barcodes/.md)
- [Inventory Accuracy: Cycle Counting with Barcode Scanners](https://barcodefyi.com/guide/cycle-counting-barcodes/.md)
- [Invisible Barcodes: Digimarc, Watermarks & Embedded Codes](https://barcodefyi.com/guide/invisible-barcodes/.md)
- [ISBN & ISSN Barcodes: Identifying Books & Periodicals](https://barcodefyi.com/guide/isbn-issn-barcodes/.md)
- [ISO/IEC 15415: 2D Barcode Verification Standards](https://barcodefyi.com/guide/iso-15415-2d-verification/.md)
- [ISO/IEC 15416: Barcode Print Quality Grading Explained](https://barcodefyi.com/guide/iso-15416-print-quality/.md)
- [ITF-14: The Outer Case Barcode for Logistics](https://barcodefyi.com/guide/itf-14-deep-dive/.md)
- [Laboratory Specimen Barcodes: Tube Labeling & LIMS](https://barcodefyi.com/guide/laboratory-specimen-barcodes/.md)
- [Last-Mile Delivery Barcodes: From Hub to Doorstep](https://barcodefyi.com/guide/last-mile-delivery-barcodes/.md)
- [MaxiCode: The Barcode on Every UPS Package](https://barcodefyi.com/guide/maxicode-deep-dive/.md)
- [Medication Barcode Scanning: Reducing Errors at Bedside](https://barcodefyi.com/guide/medication-barcode-scanning/.md)
- [Migrating Barcode Systems: Version Upgrades & Format Changes](https://barcodefyi.com/guide/migrating-barcode-systems/.md)
- [Mobile Wallet Barcodes: Apple Wallet, Google Pay & Passbook](https://barcodefyi.com/guide/mobile-wallet-barcodes/.md)
- [Mobile Warehouse Scanners: Choosing the Right Device](https://barcodefyi.com/guide/mobile-warehouse-scanners/.md)
- [Monitoring & Alerting for Barcode Infrastructure](https://barcodefyi.com/guide/monitoring-barcode-infrastructure/.md)
- [Omnichannel Barcodes: BOPIS, Ship-from-Store & Returns](https://barcodefyi.com/guide/omnichannel-barcodes/.md)
- [Pallet & Case Labeling: ITF-14 vs GS1-128](https://barcodefyi.com/guide/pallet-case-labeling/.md)
- [Patient Wristband Barcodes: Design & Safety Standards](https://barcodefyi.com/guide/patient-wristband-barcodes/.md)
- [PDF417: The Stacked Barcode on Your Driver's License](https://barcodefyi.com/guide/pdf417-deep-dive/.md)
- [Pharmacy Dispensing Barcodes: NDC & Unit-of-Use Packaging](https://barcodefyi.com/guide/pharmacy-dispensing-barcodes/.md)
- [Pick-Pack-Ship: Barcode Workflows for Order Fulfillment](https://barcodefyi.com/guide/pick-pack-ship-barcodes/.md)
- [Postal Barcodes: POSTNET, Intelligent Mail & Royal Mail](https://barcodefyi.com/guide/postal-barcodes-guide/.md)
- [Printing Barcodes on Corrugated Board: Challenges & Solutions](https://barcodefyi.com/guide/barcodes-corrugated-board/.md)
- [Private Label Barcodes: When You Control the Supply Chain](https://barcodefyi.com/guide/private-label-barcodes/.md)
- [QR Code Marketing: From Print to Digital Experience](https://barcodefyi.com/guide/qr-code-marketing/.md)
- [QR Code Origin Story: Denso Wave & the Auto Industry](https://barcodefyi.com/guide/qr-code-origin-story/.md)
- [QR Code Payments: How Scan-to-Pay Works](https://barcodefyi.com/guide/qr-code-payments/.md)
- [Quiet Zone Violations: The #1 Barcode Print Failure](https://barcodefyi.com/guide/quiet-zone-violations/.md)
- [Retail Analytics from Barcode Data: Sales & Basket Analysis](https://barcodefyi.com/guide/retail-barcode-analytics/.md)
- [Retail Inventory Management with Barcodes](https://barcodefyi.com/guide/retail-inventory-barcodes/.md)
- [Returns & Reverse Logistics Barcodes](https://barcodefyi.com/guide/returns-reverse-logistics/.md)
- [RFID & Barcodes: Competition, Coexistence & Convergence](https://barcodefyi.com/guide/rfid-barcode-convergence/.md)
- [Self-Checkout Barcode Systems: Design & Challenges](https://barcodefyi.com/guide/self-checkout-barcodes/.md)
- [Serialization & Track-and-Trace with Barcodes](https://barcodefyi.com/guide/serialization-track-trace/.md)
- [Shipping Label Barcodes: GS1-128 & Carrier Standards](https://barcodefyi.com/guide/shipping-label-barcodes/.md)
- [Shrink & Loss Prevention: Barcodes as Security Tools](https://barcodefyi.com/guide/loss-prevention-barcodes/.md)
- [Smartphone Barcode Scanning: Camera APIs & Libraries](https://barcodefyi.com/guide/smartphone-barcode-scanning/.md)
- [SSCC & Pallet Labels: Case-Level Supply Chain Tracking](https://barcodefyi.com/guide/sscc-pallet-labels/.md)
- [Sunrise 2027: The QR Code Transition in Retail](https://barcodefyi.com/guide/sunrise-2027-qr-transition/.md)
- [Surgical Instrument Barcodes: Direct Part Marking on Steel](https://barcodefyi.com/guide/surgical-instrument-barcodes/.md)
- [Testing Barcode Systems: Unit Tests to Production Validation](https://barcodefyi.com/guide/testing-barcode-systems/.md)
- [The Barcode Wars: UPC vs European Article Number](https://barcodefyi.com/guide/barcode-wars-upc-ean/.md)
- [The First UPC Scan: June 26, 1974 — Wrigley's Gum](https://barcodefyi.com/guide/first-upc-scan-1974/.md)
- [The Future of Product Identification: Beyond Barcodes](https://barcodefyi.com/guide/future-product-identification/.md)
- [The GS1 Digital Link Standard: Barcodes Meet the Web](https://barcodefyi.com/guide/gs1-digital-link-history/.md)
- [The Invention of the Barcode: From Beach Sand to Patent](https://barcodefyi.com/guide/invention-of-barcode/.md)
- [The Rise of 2D Barcodes: From PDF417 to Data Matrix](https://barcodefyi.com/guide/rise-of-2d-barcodes/.md)
- [Thermal Printing for Barcodes: Direct vs Transfer](https://barcodefyi.com/guide/thermal-printing-barcodes/.md)
- [Troubleshooting Barcode Scan Failures: A Diagnostic Guide](https://barcodefyi.com/guide/troubleshooting-scan-failures/.md)
- [Understanding Barcode Symbology Standards (ISO/IEC)](https://barcodefyi.com/guide/barcode-symbology-standards/.md)
- [UPC-A & UPC-E: North American Product Barcodes](https://barcodefyi.com/guide/upc-a-upc-e-guide/.md)
- [UPC vs EAN: Why North America Switched to 13 Digits](https://barcodefyi.com/guide/upc-vs-ean-migration/.md)
- [Vaccine Cold Chain Barcodes: 2D Codes for Temperature-Sensitive Products](https://barcodefyi.com/guide/vaccine-cold-chain-barcodes/.md)
- [Variable Measure Items: Weight, Length & Price Barcodes](https://barcodefyi.com/guide/variable-measure-barcodes/.md)
- [Warehouse Barcode Systems: WMS Integration Guide](https://barcodefyi.com/guide/warehouse-barcode-wms/.md)
- [Warehouse Location Barcodes: Bin, Shelf & Zone Labeling](https://barcodefyi.com/guide/warehouse-location-barcodes/.md)
- [What Is a Barcode? A Complete Introduction](https://barcodefyi.com/guide/what-is-a-barcode/.md)
- [Wi-Fi QR Codes: One-Scan Network Configuration](https://barcodefyi.com/guide/wifi-qr-codes/.md)

## Standards (12)
- [AIM Uniform Symbology Specification](https://barcodefyi.com/standard/aim-uss/.md): AIM
- [GS1 General Specifications](https://barcodefyi.com/standard/gs1-general-specs/.md): GS1
- [ISO/IEC 15416 — Linear Barcode Print Quality](https://barcodefyi.com/standard/iso-15416/.md): ISO/IEC
- [ISO/IEC 15417 — Code 128 Symbology Specification](https://barcodefyi.com/standard/iso-15417/.md): ISO/IEC
- [ISO/IEC 15418 — GS1 Application Identifiers and ASC Data Identifiers](https://barcodefyi.com/standard/iso-15418/.md): ISO/IEC
- [ISO/IEC 15420 — EAN/UPC Symbology Specification](https://barcodefyi.com/standard/iso-15420/.md): ISO/IEC
- [ISO/IEC 15438 — PDF417 Symbology Specification](https://barcodefyi.com/standard/iso-15438/.md): ISO/IEC
- [ISO/IEC 16022 — Data Matrix Symbology Specification](https://barcodefyi.com/standard/iso-16022/.md): ISO/IEC
- [ISO/IEC 16388 — Code 39 Symbology Specification](https://barcodefyi.com/standard/iso-16388/.md): ISO/IEC
- [ISO/IEC 16390 — Interleaved 2 of 5 Symbology Specification](https://barcodefyi.com/standard/iso-16390/.md): ISO/IEC
- [ISO/IEC 24723 — GS1 DataBar Symbology Specification](https://barcodefyi.com/standard/iso-24723/.md): ISO/IEC
- [ISO/IEC 24778 — Aztec Code Symbology Specification](https://barcodefyi.com/standard/iso-24778/.md): ISO/IEC

## Key Glossary Terms
- [Application Identifier](https://barcodefyi.com/glossary/application-identifier/.md): A 2-4 digit prefix in GS1-128/GS1 DataMatrix that defines the type and format of
- [Area Imager](https://barcodefyi.com/glossary/area-imager/.md): A 2D barcode scanner using a camera-like sensor to capture both 1D and 2D barcod
- [Check Digit](https://barcodefyi.com/glossary/check-digit/.md): A mathematically calculated digit appended to barcode data to verify scanning ac
- [Check Digit Algorithm](https://barcodefyi.com/glossary/check-digit-algorithm/.md): A mathematical formula for calculating verification digits to detect barcode sca
- [Code 128](https://barcodefyi.com/glossary/code-128-term/.md): A high-density variable-length barcode encoding all 128 ASCII characters with th
- [Code 39](https://barcodefyi.com/glossary/code-39-term/.md): A variable-length alphanumeric barcode supporting uppercase letters, digits, and
- [Data Matrix](https://barcodefyi.com/glossary/data-matrix-term/.md): A 2D matrix barcode storing up to 2,335 alphanumeric characters in a compact squ
- [DSCSA](https://barcodefyi.com/glossary/dscsa/.md): Drug Supply Chain Security Act, US law requiring barcode-based serialization and
- [EAN-13](https://barcodefyi.com/glossary/ean-13/.md): The European Article Number, a 13-digit barcode used worldwide for marking retai
- [First UPC Scan](https://barcodefyi.com/glossary/first-upc-scan/.md): On June 26, 1974, a pack of Wrigley's Juicy Fruit gum became the first product s
- [FMD](https://barcodefyi.com/glossary/fmd/.md): Falsified Medicines Directive, EU regulation requiring serialized 2D barcodes on
- [GS1](https://barcodefyi.com/glossary/gs1/.md): The global standards organization managing barcode systems, GTIN numbers, and su
- [GS1-128](https://barcodefyi.com/glossary/gs1-128-term/.md): A subset of Code 128 using GS1 Application Identifiers to encode structured supp
- [GS1 Company Prefix](https://barcodefyi.com/glossary/gs1-company-prefix/.md): A unique number assigned by GS1 to a company, forming the first part of all thei
- [GS1 DataMatrix](https://barcodefyi.com/glossary/gs1-datamatrix-term/.md): Data Matrix combined with GS1 Application Identifiers for pharmaceutical seriali
- [GS1 Digital Link](https://barcodefyi.com/glossary/gs1-digital-link/.md): A web URI standard encoding GS1 identifiers, enabling QR codes to replace tradit
- [GTIN](https://barcodefyi.com/glossary/gtin/.md): Global Trade Item Number, the unique numeric identifier for products, encoded in
- [ISO/IEC 15416](https://barcodefyi.com/glossary/iso-15416-term/.md): The international standard for linear barcode print quality verification, defini
- [Laser Scanner](https://barcodefyi.com/glossary/laser-scanner/.md): A barcode scanner using a laser beam swept across the barcode, reading reflected
- [Mobile Scanning](https://barcodefyi.com/glossary/mobile-scanning/.md): Using smartphone cameras as barcode scanners via apps or native camera integrati
- [Module](https://barcodefyi.com/glossary/module/.md): The narrowest element (bar or space) in a barcode. All wider elements are multip
- [Modulo 10](https://barcodefyi.com/glossary/modulo-10/.md): The most common check digit algorithm, used by EAN/UPC, dividing the weighted su
- [PDF417](https://barcodefyi.com/glossary/pdf417-term/.md): A stacked linear barcode storing up to 1,850 alphanumeric characters, used on ID
- [Point of Sale](https://barcodefyi.com/glossary/point-of-sale/.md): The retail checkout system where product barcodes are scanned for pricing and in
- [QR Code](https://barcodefyi.com/glossary/qr-code-ref/.md): A 2D matrix barcode invented by DENSO WAVE, capable of encoding up to 7,089 nume
- [Quiet Zone](https://barcodefyi.com/glossary/quiet-zone/.md): A blank margin required on both sides of a barcode to ensure reliable scanning.
- [Serialization](https://barcodefyi.com/glossary/serialization/.md): Assigning unique serial numbers to individual product units, encoded in barcodes
- [Symbology](https://barcodefyi.com/glossary/symbology-term/.md): The set of rules defining how data is encoded into bars and spaces. Each barcode
- [Thermal Transfer Printing](https://barcodefyi.com/glossary/thermal-transfer/.md): Printing method using heated ribbon transferred to labels, producing durable, hi
- [UPC-A](https://barcodefyi.com/glossary/upc-a/.md): The Universal Product Code, a 12-digit barcode standard used for retail products

## Interactive Tools (10)
- [Barcode Generator](https://barcodefyi.com/tools/barcode-generator/): Generate production-ready barcodes in 20+ symbologies including EAN-13, UPC-A, C
- [Barcode Print Size Calculator](https://barcodefyi.com/tools/size-calculator/): Calculate the correct print dimensions for any barcode symbology at a given magn
- [Barcode Reader](https://barcodefyi.com/tools/barcode-reader/): Scan and decode barcodes using your device camera or by uploading an image. Supp
- [Barcode Validator](https://barcodefyi.com/tools/barcode-validator/): Validate barcode data integrity across multiple symbologies. Checks format compl
- [Batch Barcode Generator](https://barcodefyi.com/tools/batch-generator/): Upload a CSV file of barcode data and generate barcodes in bulk. Supports multip
- [Check Digit Calculator](https://barcodefyi.com/tools/check-digit-calculator/): Calculate and verify check digits for EAN-13, UPC-A, ISBN-13, ISSN, ITF-14, and 
- [GS1 Prefix Lookup](https://barcodefyi.com/tools/gs1-prefix-lookup/): Look up the country of registration for any GS1 barcode prefix. Enter a barcode 
- [ISBN-10 / ISBN-13 Converter](https://barcodefyi.com/tools/isbn-converter/): Convert between ISBN-10 and ISBN-13 formats with automatic check digit recalcula
- [Symbology Recommender](https://barcodefyi.com/tools/symbology-recommender/): Answer a series of questions about your data type, scanning environment, label s
- [UPC-A / UPC-E Converter](https://barcodefyi.com/tools/upc-converter/): Convert between UPC-A (12-digit) and UPC-E (8-digit zero-suppressed) formats. Vi

## Comparisons (30)
- [1D Barcodes vs 2D Barcodes](https://barcodefyi.com/compare/1d-vs-2d-barcodes-comparison/.md)
- [Codabar vs Code 39](https://barcodefyi.com/compare/codabar-vs-code-39/.md)
- [Code 128 vs Codabar](https://barcodefyi.com/compare/code-128-vs-codabar/.md)
- [Code 128 vs Code 39](https://barcodefyi.com/compare/code-128-vs-code-39/.md)
- [Code 128 vs Data Matrix](https://barcodefyi.com/compare/code-128-vs-data-matrix/.md)
- [Code 128 vs GS1-128](https://barcodefyi.com/compare/code-128-vs-gs1-128/.md)
- [Code 39 vs Code 93](https://barcodefyi.com/compare/code-39-vs-code-93/.md)
- [Composite Barcode vs GS1-128](https://barcodefyi.com/compare/composite-vs-gs1-128/.md)
- [Data Matrix vs Aztec Code](https://barcodefyi.com/compare/data-matrix-vs-aztec/.md)
- [Data Matrix vs GS1 DataMatrix](https://barcodefyi.com/compare/data-matrix-vs-gs1-datamatrix/.md)
- [Data Matrix vs PDF417](https://barcodefyi.com/compare/data-matrix-vs-pdf417/.md)
- [DotCode vs Data Matrix](https://barcodefyi.com/compare/dotcode-vs-data-matrix/.md)
- [EAN-13 vs Code 128](https://barcodefyi.com/compare/ean-13-vs-code-128/.md)
- [EAN-13 vs Data Matrix](https://barcodefyi.com/compare/ean-13-vs-data-matrix/.md)
- [EAN-13 vs EAN-8](https://barcodefyi.com/compare/ean-13-vs-ean-8/.md)
- [EAN-13 vs UPC-A](https://barcodefyi.com/compare/ean-13-vs-upc-a/.md)
- [GS1-128 vs GS1 DataMatrix](https://barcodefyi.com/compare/gs1-128-vs-gs1-datamatrix/.md)
- [GS1 DataBar vs EAN-13](https://barcodefyi.com/compare/gs1-databar-vs-ean-13/.md)
- [GS1 DataBar vs GS1 DataBar Expanded](https://barcodefyi.com/compare/gs1-databar-vs-gs1-databar-expanded/.md)
- [Han Xin vs Data Matrix](https://barcodefyi.com/compare/han-xin-vs-data-matrix/.md)
- [ISBN vs EAN-13](https://barcodefyi.com/compare/isbn-vs-ean-13/.md)
- [ITF-14 vs GS1-128](https://barcodefyi.com/compare/itf-14-vs-gs1-128/.md)
- [ITF vs ITF-14](https://barcodefyi.com/compare/itf-vs-itf-14/.md)
- [MaxiCode vs Data Matrix](https://barcodefyi.com/compare/maxicode-vs-data-matrix/.md)
- [MSI Plessey vs Code 128](https://barcodefyi.com/compare/msi-plessey-vs-code-128/.md)
- [PDF417 vs Aztec Code](https://barcodefyi.com/compare/pdf417-vs-aztec/.md)
- [PDF417 vs Micro PDF417](https://barcodefyi.com/compare/pdf417-vs-micro-pdf417/.md)
- [Pharmacode vs Code 128](https://barcodefyi.com/compare/pharmacode-vs-code-128/.md)
- [POSTNET vs Intelligent Mail](https://barcodefyi.com/compare/postnet-vs-intelligent-mail/.md)
- [UPC-A vs UPC-E](https://barcodefyi.com/compare/upc-a-vs-upc-e/.md)

## Page Types
- /symbology/{slug}/ — Detailed symbology page with specs
- /symbology/{sym}/for-{industry}/ — Industry-specific barcode guide
- /family/{slug}/ — Symbology family tree
- /prefix/{country}/ — GS1 prefix by country
- /check-digit/{slug}/ — Check digit algorithm
- /worksheet/{slug}/ — Interactive check digit worksheet
- /standard/{slug}/ — Barcode standard reference
- /regulation/{slug}/ — Regulatory requirement
- /print-spec/{slug}/ — Print specification
- /guide/{slug}/ — In-depth barcode guide
- /glossary/{slug}/ — Barcode terminology
- /tools/{slug}/ — Interactive barcode tools
- /compare/{slug}/ — Symbology comparison

## Data Sources
- GS1 General Specifications
- ISO/IEC barcode standards (15416, 15420, 16388, etc.)
- FDA, EU FMD, and other regulatory databases

## Related
- [QRCodeFYI](https://qrcodefyi.com/llms.txt) — The QR Code Encyclopedia & Toolkit (15 types)
- [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