BarcodeOwl

Barcode Generator for Inventory Management

Preconfigured for Code 128 — the right symbology for this use case.

PNG downloads at 1x–4x resolution.

Preview

PNG for documents & web, SVG for print & designers — always free, no watermark, no signup.

Barcoding your inventory is a three-part system: identifiers (SKUs), labels (barcodes), and something that scans them (a $30 USB scanner or a phone). The generator above is preconfigured for Code 128 — the right symbology for internal inventory — and the tools below produce the identifiers and labels in bulk.

No GS1 license needed, no enterprise software required: internal barcodes are free-form and free forever.

The $0 barcode inventory system

1. Identifiers. Give every distinct item a short SKU — prefix + sequence (OWL-TEE-0001), not a description. The SKU generator enforces the good habits (uppercase, unambiguous characters, consistent length) so the scheme survives growth.

2. Labels. Export the SKU list and run it through the bulk barcode generator: Code 128, PNG at 3–4x, printed on address-label sheets or a thermal label printer. One scan beats one typed SKU forever.

3. Scanning. Any USB/Bluetooth scanner works as a keyboard wedge — it types the SKU wherever the cursor is, so a Google Sheet or Airtable becomes a usable inventory system. When you outgrow spreadsheets, every WMS and POS on the market imports CSVs of exactly the identifiers you just made.

Why Code 128 for inventory

Code 128 encodes full ASCII at high density with a built-in checksum, and every scanner made since the 1990s reads it. It's the default for bin locations, asset tags, license plates (LPNs) and pick tickets. The only time you need something else: retail products sold by other stores (that's GS1 UPC/EAN territory), tiny labels (DataMatrix), or phone-scanning by end users (QR).

Labeling rules that prevent pain

  • Label the location, not just the item — bin and shelf barcodes (e.g. WH-A03-S2) make cycle counts fast
  • Matte labels only; gloss laminates reflect scanner lasers into misreads
  • Minimum practical Code 128 print size: about 1.5" wide for a 10-character SKU at 300 DPI
  • Laminate or use polyester labels for anything handled daily or stored cold
  • Keep the numbering scheme documented — the person who inherits your inventory will thank you

When to upgrade to real inventory software

Spreadsheet + barcodes carries a single-location operation surprisingly far (hundreds of SKUs, one or two people counting). The breaking points: multiple locations, more than ~3 people scanning concurrently, or a need for lot/expiry tracking (that's when GS1-128's Application Identifiers and a real WMS earn their cost). The barcodes you generate today import into all of them — nothing is thrown away.

Frequently asked questions

Which barcode should I use for inventory?

Code 128 for almost everything internal: SKUs, bin locations, asset tags. It's compact, full-ASCII and universally readable. Use QR only if untrained people will scan with phones, and DataMatrix if labels must be tiny.

Do I need GS1 barcodes for internal inventory?

No. GS1 numbers (UPC/EAN/GTIN) are only required when products are sold through retailers or marketplaces. Internal inventory can use any numbering scheme you invent — Code 128 barcodes of your SKUs cost nothing and need no registration.

What do I need to start barcode inventory tracking?

Three things: a SKU for every item (SKU generator), printed Code 128 labels (bulk barcode generator + any printer), and a scanner — a $25–40 USB scanner or a phone app. A spreadsheet is enough software to start.

SKU vs serial number in inventory — what's the difference?

A SKU identifies the product type (all red mugs share one SKU); a serial number identifies one specific unit (this exact laptop). Most inventory runs on SKUs; serials matter for warranties, recalls and high-value assets. Both generators are linked below.

How many labels can I print from one list?

The bulk tool turns a CSV of SKUs into a ZIP of barcode images — 10 per batch free, which covers most small setups in a few batches. Unlimited batches and print-ready label sheets are planned for BarcodeOwl Pro.

Will these barcodes work with Shopify/Square/my POS?

Yes — POS and inventory systems accept any barcode value as the product lookup key. Enter the SKU as the product's barcode field, scan, done. For products you resell (not your own brand), keep using the manufacturer's UPC instead.

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