Guides library
Barcode & QR Code guides
Topic articles on retail GTINs, marketplace listings, warehouse naming, print production, and each supported symbology-written as references, not renamed generator help text.
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EAN-13 vs UPC-A
GTIN-12 versus GTIN-13, leading zeros, check digits, and which POS symbol to print for your market.
Barcode vs QR Code in 2026
Choose by scanner type, workflow, and payload size-not by which format looks more modern on the pack.
Create up to 10 barcodes
Type, start value, count 1-10, trailing-digit increment rules, and how GTIN batches recalculate the check digit.
EAN-13 for Amazon
GTIN ownership versus drawing bars, catalog matching, and FBA label boundaries-always verify Seller Central.
Warehouse barcodes
Bin versus SKU versus carton IDs, naming rules that survive WMS exports, and which symbology fits each field.
Pharma inventory & serialization
GTIN with lot, expiry, and serial; where GS1 DataMatrix fits; why Pharmacode is packaging-line verification, not a substitute.
Retail POS standards
When consumer packs should use EAN-13, EAN-8, or UPC-A-a selection guide, not a full encoder manual.
Industrial & logistics codes
Decision matrix for Code 39, Code 128, ITF-14, MSI, and Pharmacode-when to use each and when to avoid it.
SVG QR for print
Quiet zone, module size, vector versus DPI myths, and a RIP checklist for production artwork.
QR Code structure
Versions, error correction (level M here), four-module quiet zone, and URL versus plain-text payloads.
Code 128
Code sets A/B/C, numeric compression, Modulo-103 in outline, and GS1-128 composition limits on this tool.
EAN-13 encoding
Digit roles, worked Modulo-10 example, L/G/R parity overview, quiet zones, and magnification.
EAN-8 for small packs
GTIN-8 allocation versus shrinking an EAN-13 drawing-space limits and common misuse.
UPC-A (North America)
Twelve-digit POS symbol, leading-zero link to EAN-13, and a worked check-digit walkthrough.
Code 39
Allowed charset, start/stop asterisks, wide/narrow ratio, and density compared with Code 128.
ITF-14 cartons
GTIN-14 on outer cases, bearer bars on corrugated board, and consumer-unit versus case hierarchy.
MSI Plessey
Legacy shelf digits, Mod 10/11 variants, and why this generator does not append a check digit for you.
Pharmacode
Binary packaging-line codes (3-131070)-line verification, not GTIN serialization or “security holograms.”