POSTNET Print Specification

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POSTNET uses a height-modulated encoding scheme with tall and short bars rather than wide/narrow widths, making it unique among linear symbologies. Designed for USPS automated mail sorting, it requires precise bar height control: short bars at 1.27mm and tall bars at 3.175mm with fixed 3.175mm quiet zones.

  



  

  
  

    
Symbology

    
      POSTNET