QR Code Guides
Everything you need to design, print, and deploy reliable QR codes.
QR codes look simple on screen, but reliable deployment depends on error correction, quiet zones, contrast, file format (PNG vs SVG), and whether the payload is static or redirect-based. These guides explain how matrix codes work and how to avoid unscannable print runs.
Articles cover structure and standards, sizing for viewing distance, WiFi and vCard payloads, logo placement, outdoor signage, analytics hooks, and security considerations when codes appear in public spaces. Use them alongside the QR Code Generator and QR Scan tools while you iterate.
Comparing QR to retail barcodes? Read QR vs barcode when packaging needs both consumer scans and POS stripes.
What Is a QR Code?
A QR code is a two-dimensional matrix barcode that stores data in a square grid of modules.
How Do QR Codes Work?
Cameras locate finder patterns, sample modules, then reconstruct the encoded bitstream.
Static vs Dynamic QR Codes
Static codes embed the final payload; dynamic codes usually redirect through a short URL you can edit later.
QR Code Error Correction Levels
Levels L, M, Q, and H trade capacity for resilience against damage or logo overlays.
QR Code Size Guidelines
Print size depends on scan distance, module density, and surface quality.
Printing QR Codes
Maintain quiet zones, contrast, and resolution so industrial presses do not blur modules.
SVG vs PNG for QR Codes
SVG scales cleanly for print; PNG is convenient for web and email.
How to Scan a QR Code
Open the camera or a scanner app, fill the frame, and hold steady until the payload appears.
Do QR Codes Expire?
The printed pattern does not expire, but the destination might.
QR Code Security Basics
Treat unknown QR codes like unknown hyperlinks — previews matter.
QR Code Quiet Zone
The quiet zone is the blank margin around modules that scanners need to lock onto the code.
QR Code Colors & Contrast
Dark modules on a light background remain the most reliable combination for phone cameras.
Adding a Logo to a QR Code
Center logos need higher error correction and larger print sizes to stay scannable.
WiFi QR Codes Explained
WiFi QRs encode SSID, encryption, and password so guests join without typing.
vCard QR Codes Best Practices
vCard QRs let prospects save name, phone, email, and company in one scan.