QR Code Design & Customisation

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How to embed a logo without breaking scannability: EC level selection, safe area calculation, and design templates.

  
  

    
  








  
  

    
    
      
      
  1. 
        Adding Your Logo to a QR Code Safely
      
    2. 
      
      
  2. 
        Step-by-Step Process
      
    3. 
      
      
  3. 
        Logo Design Guidelines
      
    4. 
      
      
  4. 
        Common Mistakes
      
    5. 
      
      
  5. 
        Professional Tools
      
    6. 
      
      
  6. 
        Key Takeaways
      
    7. 
      
    

  









  
  

  
  

    
    

      
Adding Your Logo to a QR Code Safely


A logo in the centre of your QR code adds brand recognition, but it covers data modules and relies on error correction to keep the code functional. Here is how to do it safely.


Step-by-Step Process


1. Choose EC Level H
Error correction Level H provides ~30% recovery, giving you room for a logo covering up to ~15-20% of the code area. Never embed a logo at EC Level L or M.


2. Generate the QR code first
Create the complete QR code with your data. Do not try to design the QR code around the logo.


3. Calculate safe logo size
For a QR code with N modules per side, the safe centre area is approximately:


    

  • Maximum logo width: N * 0.3 modules (30% of one dimension)
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  • This covers roughly 9% of the total area (0.3 x 0.3), well within EC-H capacity
    • 



4. Add a white border around the logo
A 1-2 module white border between the logo and the surrounding QR modules improves contrast and scannability.


5. Overlay the logo
Place the logo image over the centre of the generated QR code. The covered modules become effectively "damaged."


6. Test thoroughly
Scan with multiple devices at various distances and angles. If any test fails, reduce the logo size.


Logo Design Guidelines


    

  • Simple shapes work best: Detailed logos at small sizes become unrecognisable
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  • High contrast: The logo should be visually distinct from the QR modules
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  • Square or circular: These shapes fit naturally in the QR code centre
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  • Transparent background: Let the QR code's light modules show around the logo edges
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Common Mistakes


    

  1. Logo too large: Covering more than 20% of the QR area at EC-H
    2. 

  2. Low-contrast logo: A dark logo on dark QR modules reduces readability
    3. 

  3. EC Level M or lower: Insufficient error correction for logo coverage
    4. 

  4. Logo over finder patterns: Never cover the three corner squares
    5. 

  5. No testing: Assuming the code works without scanning
    6. 



Professional Tools


Most QR code design tools (compared here) offer logo embedding with automatic EC level adjustment:


    

  • Calculate the safe logo area automatically
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  • Centre the logo precisely
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  • Add the white border around the logo
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  • Set EC Level H by default
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Key Takeaways


    

  • Always use EC Level H when embedding a logo
    • 

  • Safe logo coverage is approximately 15-20% of the total area
    • 

  • Generate the QR code first, then overlay the logo
    • 

  • Add a white border around the logo for better contrast
    • 

  • Test on multiple devices before printing — this is non-negotiable
    •