Written by Marcus Rivera — Former Amazon Warehouse Operations Manager. I've set up barcode systems for warehouses small and large. More about me →When I left Amazon and started consulting for small businesses, every warehouse owner asked the same question: "How do I track inventory without spending ten grand on a WMS?" They all assumed barcode systems were enterprise-only. They're not. Here's the setup I've installed at half a dozen small warehouses for under $500 total.
You need three things: a barcode printer (I recommend the Rollo wireless at $199), a USB scanner (TaoTronics handheld, $35), and a spreadsheet. Yes, a spreadsheet. Google Sheets with a barcode column is the most underrated inventory tool I've ever used. Each row gets a unique barcode. The scanner types the number into the search box. You update quantities manually. It's not pretty, but it works for warehouses under 5,000 SKUs.
Use Code 128 for internal bin labels and shelf tags. It handles alphanumeric—so you can encode location codes like "A12-B03-C7"—and every scanner reads it. For products that leave your warehouse, use UPC-A or EAN-13 depending on your market. Print all barcodes at 300 DPI minimum on white labels. I learned this the hard way when an entire pallet of Code 39 labels smeared on kraft cardboard and became unreadable. genbarcode.org generates all these formats free in your browser.
Never print a barcode without scanning it first. Test-scan every batch before applying labels. Print 100 labels, scan all 100. One bad print run at 3 AM can cost you hours of rework. I learned this the hard way at Amazon and I've seen six small warehouses repeat the same mistake. The scanner is your QA tool.
Written by Marcus Rivera — Former Amazon Warehouse Operations Manager. I've set up barcode systems for warehouses small and large. More about me →