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The smallest unit of a QR code — a single dark or light square. A Version 1 QR code is 21x21 modules (441 total), while a Version 40 is 177x177 (31,329 total). The physical size of a module determines the minimum print resolution required for reliable scanning.


  



  

  
  
  
  

  
  
  
  

    
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      Timing Pattern
      
      Quiet Zone
      
      Dark Module
      
      Data Region
      
      Version
      
      Module Size
      
      Contrast Ratio
      
      Coordinate System
      
      Rounded Modules
      
    

  

  
  

  
  
  

    
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