A QR (Quick Response) code is a 2D barcode that stores data like URLs, text, or contact info, readable by smartphones.

What can I put in a QR code?

URLs, plain text, phone numbers, SMS, email addresses, WiFi credentials, contact cards (vCard), and more.

What size should my QR code be?

Minimum 2x2cm for print. Larger for scanning from distance. Always test before printing.

Static QR codes never expire. Dynamic QR codes (from some services) may require subscription.

QR Code Basics: Everything You Need to Know

QR codes are everywhere in 2025 - from restaurant menus to product packaging. Here's everything you need to know about this powerful technology.

What Is a QR Code?

QR stands for "Quick Response." A QR code is a two-dimensional barcode that can store much more information than traditional barcodes.

**Key characteristics:** - Can store URLs, text, contact info, WiFi credentials, and more - Readable from any direction (360 degrees) - Works even if partially damaged (error correction) - Scanned instantly by smartphone cameras

How QR Codes Work

QR codes encode data in a pattern of black and white squares:

Position markers (large squares in corners) help cameras locate the code
Timing patterns help decode the grid
Data is encoded in the remaining squares
Error correction allows reading even damaged codes

Types of QR Codes

**Static QR Codes:** - Content is fixed when created - Cannot be changed after printing - Free to create and use forever - Best for permanent information

**Dynamic QR Codes:** - Content can be changed anytime - Tracks scan statistics - Requires a subscription service - Best for marketing campaigns

Common QR Code Uses

**URLs**: Link to websites, landing pages, or apps **WiFi**: Share network credentials instantly **vCards**: Digital business cards with contact info **Email**: Pre-filled email addresses and subjects **SMS**: Pre-composed text messages **Phone**: Click-to-call phone numbers **Location**: Open maps to specific coordinates **Payment**: Mobile payment processing

Why QR Codes Are So Popular

The pandemic accelerated QR adoption dramatically:

Contactless interactions became essential
Smartphone cameras improved (no app needed)
People learned how to use them
Businesses found countless applications

Nearly 100 million Americans will scan QR codes in 2025.

QR Code Capacity

A single QR code can store: - Up to 7,089 numeric characters - Up to 4,296 alphanumeric characters - Up to 2,953 bytes of binary data

For most uses, keeping content under 100 characters ensures fast, reliable scanning.