QR Code Version and Error Correction

Quick Facts: 

• QR Code
  • the QR stands for Quick Response
  • QR Codes come in different Version
  • The Version determines how many characters can be encoded
  • The type of characters set also influences how many characters can be encoded
    • numbers
    • numbers and letters
    • numbers and letters and special characters
    • etc. 
  • there are 40 QR code versions - we will only provide details up to version 5
  • version numbers module/cell count increases in increments of 4 per side between version

• Modules/Cells
  • QR codes are essentially squares arranged in a square grid on a contrasting background
    • i.e. black squares in a square grid on a white background
  • each of those squares is also referred to as a module or a cell

• Error Correction/Error Correction Level
  • error correction level means that 'backup' data is added to the QR code in case some of it gets covered up or damaged
  • there are 4 different error correction levels
    • L (7%)
    • M (15%)
    • Q (25%)
    • H (30%)
  • to find the error correction used on a QR code that does not scan check the highlighted areas

• Which QR Code Version to use is determined by the following
  
  • What type of data do you want to encode
  • How much data do you want to encode
  • How much of the QR code will be covered by your logo (if any)
  • how big the risk of accidental damage to the QR Code is