In short
Barcode inventory works when every sellable item has one unique code, a printed label that scans reliably, and a regular count that corrects differences. Design short, consistent SKU codes first, use the manufacturer's barcode where one exists, print labels for the rest, and count a few shelves every week instead of everything once a year.
What is the difference between a SKU and a barcode?
A SKU is your own internal code for one sellable item, such as one size and colour of a shirt. A barcode is a machine-readable picture of a code that a scanner reads. The barcode can encode your SKU or a manufacturer number, so the scanner finds the right product instantly.
How should you design SKU codes?
Use short, unique, consistent codes that follow one pattern, for example a category prefix, a model number and a variation suffix. Never reuse the code of a discontinued product, and keep letters and digits only so scanners and spreadsheets treat them the same way.
- One variation, one code: each size or colour gets its own SKU.
- Keep a fixed length per category so codes sort well.
- Avoid spaces, symbols and look-alike characters such as O and 0.
- Write the pattern down so new products follow it.
Which barcode format should you use?
Use the manufacturer's retail barcode (usually EAN-13 or UPC-A) for branded goods, because it already identifies the product worldwide. For your own items and internal use, a simple alphanumeric format such as Code 128 works well. Check which formats your label printer and software support before you commit.
| Format | Typical use | Note |
|---|---|---|
| EAN-13 / UPC-A | Retail products with a GTIN | Numbers only; numbers are issued through GS1 |
| Code 128 | Internal codes and cartons | Letters and digits, compact |
| QR code | Links or longer data | Needs a camera or 2D scanner |
How do you set up barcode inventory step by step?
Start from a clean product list, give each product and variation a code, print labels, and test scanning at the register before you stock the shelves. Do this for one category first and widen once the first one scans cleanly.
- Add your products, or import them from a spreadsheet.
- Give every product and variation a unique code.
- Print barcode labels from the product list.
- Stick each label where a scanner can reach it without folding or curving it.
- Scan a few items at the register and confirm the right product and price appear.
- Set an opening stock and a low-stock alert for each warehouse.
How do you run a stock count that you can trust?
Count in a quiet period, shelf by shelf, and record the counted quantity for each item as a stock adjustment so the difference is saved with its reason. Investigate large gaps before you accept them, and repeat with a small cycle of shelves every week rather than one yearly count.
- Pick a quiet time and stop receiving or moving stock in the area.
- Count one shelf or one category at a time.
- Enter the counted quantity as a stock adjustment.
- Review the differences and look for causes before accepting large ones.
- Record the reason so the stock history explains the change.
What causes stock to go wrong?
Stock numbers drift because of unrecorded returns, items sold under the wrong code, deliveries counted twice, damaged goods that are never written off, and shelf theft. Most of these are fixed by scanning every movement and by regular small counts.
Questions this guide answers
Do I need a barcode scanner to use barcode inventory?
A handheld scanner is the fastest way to ring up and count items, and most plug in like a keyboard. You can still search by name or code without one, but scanning removes typing errors and speeds up the queue.
Should I use the manufacturer's barcode or create my own?
Use the manufacturer's barcode whenever the product already has one, because it is unique and already printed on the pack. Create your own codes for unbranded, repacked or made-to-order items.
How often should I count stock?
Count fast-moving items every week or two and everything else on a rolling schedule through the year. Frequent small counts find problems while the cause is still easy to trace.
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Sources and further reading
General guidance, not tax, legal or accounting advice. Check current rules with the relevant authority.