I spent 12 years on the Amazon inbound dock. Every box, every case, every unit — scanned. Over those years, I saw every barcode failure mode that exists. Here is what actually matters.
The Quiet Zone Is Non-Negotiable
Every barcode format requires empty white space on both sides. EAN-13 needs 11x the narrowest bar width. ITF-14 adds a thick bearer bar because corrugated cardboard causes ink bleed. I watched thousands of shipments get rejected because the label designer cropped the barcode right to the edge.
Which Format for Which Job
Code 128 — warehouse bins, shipping labels. Alphanumeric, high-density.
