Marcus Rivera
Former Amazon Warehouse Ops · Built GenBarcode in 2026
Former Amazon Warehouse Ops · Built GenBarcode in 2026
I'm Marcus. I spent five years as an operations manager at an Amazon fulfillment center. Every day, I watched warehouse associates and third-party sellers struggle with barcode software — bloated desktop programs that cost hundreds of dollars, web tools that silently uploaded your product codes to some server, and "free" generators that slapped watermarks on everything or got the quiet zone wrong so scanners couldn't read the output.
Everything runs in your browser. The barcode encoding — Code 128, UPC-A, EAN-13 — happens in JavaScript using the Canvas API. There is no backend server. Your product codes never leave your device. You can verify this: disconnect your internet after the page loads, and the generator still works.
The trade-off: exotic formats like ITF-14 and Data Matrix aren't in the initial release (they're on the roadmap). But for 95% of everyday barcode needs — retail products, shipping labels, inventory tags — GenBarcode handles them instantly.
I keep GenBarcode free because I remember what it was like running a small warehouse on a tight budget. Barcode tools shouldn't cost $247 a year for basic functionality. The site runs on Cloudflare Pages and is supported by ads. No data collection, no premium tier, no upselling.
I'm not a barcode standards engineer or a GS1 certification officer. I'm a warehouse operations guy who learned the hard way that UPC check digits matter, that quiet zones aren't optional, and that Code 128-C is the most efficient encoding for numeric data. The articles on this site reflect that: practical knowledge from someone who's spent years on the receiving end of bad barcode software.
Bug reports, format requests, or barcode questions: [email protected]. I read everything, but as a solo developer, replies may not be instant.