Overview

QR Code Course

Learn how QR codes work: error correction, URL and Wi-Fi payloads, PNG output, and a pre-publish testing workflow.

This course teaches QR codes as scannable data carriers—not as a marketing analytics platform. You will learn what gets encoded, how error correction works, common payload formats (URLs, Wi-Fi strings, plain text), PNG output considerations for print, and a testing workflow before you ship QR assets to users.

Who this course is for

  • Developers generating QR codes for docs, runbooks, or internal tools
  • Support and ops teams publishing Wi-Fi or onboarding codes
  • Anyone who needs reliable scans without uploading content to a third-party generator

What you will learn

  1. What a QR code stores and how scanners interpret it
  2. Error correction levels L/M/Q/H and when to raise redundancy
  3. URL, text, and Wi-Fi payload patterns that scan reliably
  4. PNG size, contrast, and quiet-zone habits for print and slides
  5. A pre-publish scan checklist for real devices and lighting

Use the related QR Code Generator to experiment locally. A valid PNG does not replace scanning on the device and context your users will actually use.

Start lesson 1
Choosing QR Error Correction for Print and LinksHow L, M, Q, and H trade capacity for scan reliability—and when PNG size and contrast matter more.