QR Code Model 2 (standard)
The modern default (40 sizes; up to ~3KB alphanumeric with error correction). Most commercial generators produce Model 2.
QR Code Types: A Practical Dictionary
Static vs dynamic QR, every major QR variant, and the broader barcode family—summarized for product, marketing, and engineering teams.
Static vs Dynamic QR
Static
- Content is encoded permanently (e.g., URL, Wi‑Fi, vCard).
- No analytics or post‑print edits.
- Great for evergreen info; zero platform dependency.
Dynamic
- Short URL routes via platform for edits and A/B tests.
- Analytics (unique scans, geo, devices, time).
- Access controls, expirations, campaign governance.
QR Variants (ISO/IEC)
Micro QR
Compact symbol for tight spaces (M1–M4). Lower capacity; ideal for small labels and components.
rMQR (Rectangular Micro QR)
Rectangular footprint improves fit on narrow packages while keeping QR‑like scanning speed.
iQR
High‑capacity variant supporting square and rectangular shapes; efficient for industrial marking.
Frame/SQRC and Brand Frames
Frames and secure variants used for branding or access control; commonly combined with logos and CTAs.
Model 1 (legacy)
An older specification superseded by Model 2; rarely used today.
Other 2D Barcodes
Data Matrix (ECC 200)
Extremely compact and robust; dominant in electronics, medical devices (UDI), and manufacturing.
Aztec
No quiet zone required; often used in transit tickets and boarding passes.
PDF417
Stacked linear symbology for long text (IDs, shipping, documents).
MaxiCode
UPS/parcel logistics; bullseye center for high‑speed scanning on conveyors.
Han Xin Code
Chinese standard designed for large character sets and industrial use.
JAB Code (color)
Color 2D barcode for higher data density; niche but notable.
1D Barcodes (Linear)
UPC‑A / UPC‑E
Retail in North America; UPC‑E is the compressed variant.
EAN‑13 / EAN‑8
Global retail (GTIN). EAN‑8 for small packages.
Code 128
High‑density, full ASCII; shipping labels and logistics.
Code 39 / Code 93
Industrial and inventory; Code 93 improves density and integrity.
Interleaved 2 of 5 (ITF)
Numeric‑only; cartons and warehouse cases.
Codabar / MSI / Pharmacode
Legacy and pharma labeling systems still seen in operations.
Best Use‑Cases by Type
- Marketing: Dynamic QR (Model 2) with branding, frames, and analytics.
- Regulated labeling: Data Matrix, PDF417, or QR with error correction.
- Tickets/boarding: Aztec, PDF417, or QR depending on ecosystem.
- Tight spaces: Micro QR, rMQR, or EAN‑8.
Design & SEO Best Practices
- Maintain quiet zones and adequate print size (≥ 0.8 in / 2 cm for most signage).
- Ensure contrast ratio ≥ 4.5:1; avoid low‑contrast or busy backgrounds.
- Use branded frames and clear CTAs; place above the fold for landing pages.
- For SEO, prefer dynamic QR to control URLs, run A/B tests, and preserve link equity.
- Add alt text near scannable images and provide human‑readable fallback links.