Labelproof — the ZPL label linter

Field notes

The tool accepts ZPL, asks for the target printhead resolution and barcode application, then returns rendered output alongside findings identified by rule codes such as FLD-DPI-DESIGN-001 and GS-05. Its sample covers 203, 300, and 600 dpi workflows and reports concrete measurements, including a 0.250 mm X-dimension and a 1.478× cross-resolution shift. The page says its catalogue contains 42 rules and separates these diagnostics from physical ISO/IEC 15416 print-quality grading.