How to Label Inventory in a Warehouse

Label two things separately: every item (name, SKU, and a scannable barcode or QR code) and every storage position (a Zone-Aisle-Bay-Level code like A-03-B-02, printed at eye level on the shelf edge). A managed inventory labeling system ties the two together with one consistent barcode format, so a single scan during put-away or picking confirms both what the item is and where it belongs.

Label by: creating clear, readable labels with item name, SKU, location, and barcode/QR code, using durable label materials (weatherproof for outdoor storage), placing labels consistently (same position on items), using barcode or QR code labels for scanning, and maintaining labels (replace damaged or faded labels).

Use a hierarchical Zone → Aisle → Bay/Shelf → Level/Bin system, for example A-03-B-02 = Zone A, Aisle 03, Bay B, Level 02. Label at eye level on each shelf edge with large, high-contrast labels, and add a barcode or QR code so staff can scan it during put-away and picking.

Essential information includes: item name, SKU (stock keeping unit), location code, and barcode or QR code. Additional fields can include quantity, expiration date, supplier name, or custom fields. The barcode or QR code is what enables automated scanning — without it, every item requires manual data entry.

Barcode labels enable fast, accurate scanning (10-20x faster than manual entry), improve tracking accuracy to 95-99%, reduce identification errors by 80-90%, and make stocktakes dramatically faster. Barcode scanning is the foundation of any perpetual inventory system.

Use inventory management software (like StockFlow) to generate barcodes for each SKU, then print labels using a thermal label printer or standard printer with adhesive label paper. Ensure barcodes are at least 1 inch wide, printed at high resolution, and tested with a scanner before applying them to all items.

The four main types are: (1) Manual paper tags — cheap but slow and error-prone, no scanning support; (2) Barcode labels (1D) — the standard choice, compatible with all inventory software and handheld scanners; (3) QR code labels (2D) — store more data and can be scanned from any angle; (4) RFID tags — no line-of-sight required, but require dedicated RFID readers and cost significantly more.

For freezer environments below -18°C, use cryogenic labels specifically engineered for low temperatures — standard paper labels crack and fall off. For outdoor or high-moisture environments, use polyester or vinyl labels with a laminate overlay. When in doubt, polyester is the most versatile all-environment choice.

Use a prefix-category-sequence format, for example: TOOL-DRILL-001. Keep SKUs under 15 characters, avoid spaces and special characters, and never reuse a SKU even after an item is discontinued.

Barcodes (1D) are horizontal line patterns readable only when aligned horizontally — fast and universally supported by all scanners. QR codes (2D) can be scanned from any angle, hold significantly more data, and work with any smartphone camera. For new labeling systems, QR codes offer more flexibility; for existing barcode-scanner setups, stick with barcodes for compatibility.

For durable, high-volume labels, use a direct thermal or thermal transfer label printer — the Brother QL series (~$100) works well for small teams, while the Zebra ZD series ($250-$500) suits busier warehouse environments. For low-volume or temporary labels, a standard inkjet or laser printer with adhesive label paper is sufficient.

Conduct a label audit at least once per year, checking for faded, damaged, or missing labels. High-traffic areas like receiving docks and picking shelves may need checks every 3-6 months. Replace labels immediately when they become unreadable — always reprint and reapply rather than writing over damaged labels by hand.

Three levels minimum: a location label on every rack, shelf, or bin (usually a zone-aisle-bay-level code), a product label on every SKU, and a consistent barcode format linking the two so a scan tells you both what the item is and where it belongs.

Code 128 is standard for alphanumeric location and SKU codes on a 1D label. Use a 2D code (QR or Data Matrix) when a single scan needs to carry more than an ID — for example a batch number or expiry date.

Yes. Most inventory management software, including StockFlow, supports custom label fields where you can add multilingual descriptions alongside the primary SKU and barcode — useful for multilingual teams or export goods requiring compliance labels in multiple languages.