How to Validate a GTIN / EAN-13 Barcode Check Digit (GS1 Mod-10, explained)
If you have ever uploaded a product feed to Amazon, Google Merchant Center or Shopify and been rejected with "invalid GTIN," the culprit is almost a…
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Barcode Density Matters More Than You Think: Code 128 vs Code 39
I spent three years running inbound at an Amazon sort center, and I've watched barcodes fail in ways that textbook comparisons never cover. Here's w…
Your coding agent's barcode scanning code looks right … and breaks in the field
Coding agents write barcode scanning code that compiles and passes review, then falls apart on a damaged label. Here's how we taught them to get it…