QR Code Reference Guides
Short articles answering the questions that come up when you actually print and use QR codes.
QR Code Types and Data Formats
Every QR code scheme this tool supports, what gets encoded, and the string formats scanners commonly recognize.
Read the guide →
QR Code Error Correction Levels Explained
What L, M, Q, and H actually mean, and which one to pick.
Read the guide →
How Big Should a QR Code Be?
The distance-to-size rule for posters, packaging, and billboards.
Read the guide →
Why Won't My QR Code Scan?
The top causes when a code looks fine but cameras refuse to read it.
Read the guide →
How to Make App Store and Play Store QR Codes
Where to find the right URL, what each part means, and how to handle iPhone and Android with one or two codes.
Read the guide →