Barcode Labelling Mistakes That Slow Down Scanning and Counting

Barcodes are supposed to make warehouse work faster. A picker points a scanner, hears a beep, and moves on. A counter works through a shelf without stopping to type long codes. When labels are done well, that is exactly what happens. When labels are done badly, scanning becomes the slowest part of the job. Staff wave scanners at awkward angles, type codes by hand, skip items, or guess. Counts take longer and contain more errors, and the team starts to distrust the system the labels were meant to support.

Most barcode labelling mistakes are simple and fixable. They come from label size, print quality, placement, and housekeeping rather than from expensive technology problems. This guide walks through the mistakes that slow down scanning and counting most often, explains why each one causes trouble, and gives practical fixes a small warehouse or stockroom can apply without a big budget.

Labels That Are Too Small to Scan Reliably

A barcode needs enough size and clear space around it for a scanner to read it. When labels are squeezed onto small packaging or shrunk to fit a narrow shelf edge, the bars become too fine and the quiet zones at each end get cut off. The scanner then needs several attempts, or fails completely. Staff respond by moving closer, tilting the item, or keying the number in manually, all of which cost time on every single scan.

Fix this by choosing a label size that suits the product and the scanning distance. Shelf labels scanned from a standing position need to be larger than item labels scanned in the hand. Print a small test batch, scan from the real working distance and angle, and only then print in bulk. If a product is genuinely tiny, put the barcode on a tag, a header card, or the outer pack used for storage, rather than crushing it onto the item itself.

Poor Print Quality and Fading Labels

A barcode is a pattern of dark bars and light spaces, and scanners depend on strong contrast between the two. Faded printing, low ink or toner, smudged print, and labels printed on grey or coloured stock all reduce that contrast. The result is the familiar dance of waving an item back and forth under the scanner while a queue builds up behind the operator.

Check your printer settings before blaming the scanner. Use a print darkness setting that produces solid black bars without bleeding into the spaces. Clean print heads on thermal printers regularly, because a single dirty element can leave a thin white line through every label, making a whole batch hard to read. Replace ribbons, ink, and toner before quality visibly drops, not after staff start complaining.

Choose label material for the environment. Paper labels are fine in a dry stockroom but fall apart in cold, damp, or outdoor storage. In those areas use synthetic labels and a suitable printing method. A label that peels, curls, or turns grey within a month is not a saving, because every failed scan and relabel costs staff time. If you are still choosing hardware, our guide to choosing barcode scanners for a warehouse explains how scanner type and label quality need to match each other.

Labels Placed Where Staff Cannot Reach or See Them

Placement mistakes are among the most common barcode labelling mistakes, and among the easiest to fix. Labels get put on the bottom of boxes, on the side facing the wall, underneath shrink wrap glare, or at the very top of high racking where no one can scan without a ladder. Each awkward label adds seconds and frustration, multiplied across hundreds of scans a day.

Set a placement rule and apply it everywhere: same face, same corner, same height wherever possible. For shelf and bin labels, place them on the front edge where a picker naturally looks, aligned consistently from bay to bay. Our bin locations labelling guide goes into detail on consistent location labelling, which works hand in hand with product labels.

For item labels, avoid curved surfaces where the barcode wraps around and distorts, seams and folds where it creases, and clear film where reflections fight the scanner. If cartons arrive with supplier barcodes in awkward places, add your own label in your standard position when goods are put away. That small step at receiving pays for itself at every later pick and count.

Shiny, Wrinkled, and Damaged Labels

Glossy tape over a label, wrinkled labels on soft packaging, and labels scuffed by forklift traffic all interfere with scanning. Reflection is a particular problem: a scanner that reads perfectly on a matt label may fail on the same label covered with clear packing tape, because the tape reflects the scanner light back. Staff often solve this by tilting the item, which works but slows every scan.

Protect labels in a way that keeps them readable. Place shelf labels in plastic holders or use durable printed labels designed for warehouse use, rather than taping paper labels to racking. Keep labels away from floor level where they get kicked and splashed. During counts and general housekeeping, replace any label that is torn, peeling, or dirty as soon as you notice it.

Two Barcodes Competing on the Same Item

Many products arrive with a manufacturer barcode already printed on the packaging. If you add your own SKU label nearby, staff and scanners face two readable codes side by side. The scanner may read the wrong one, or different staff may scan different codes, splitting the same product across two records. Counts then show too much of one code and none of the other, even though the shelf total is right.

Decide one scanning standard per product and make it obvious. If your system uses the manufacturer code, do not add a second barcode. If your system uses your own SKU barcode, cover the manufacturer barcode fully or place your label directly over it, so only one code can be scanned. Our article on SKU numbers and how to create them explains how your internal codes and printed barcodes should line up, which is the foundation for avoiding this clash.

Watch for inner and outer barcodes too. A case barcode and a unit barcode may look similar but mean different quantities. If both are scannable in the same area, label clearly which is which and train staff on which one to scan for picking and which for receiving. Quantity errors from case-versus-unit confusion are large and annoying to unpick.

Wrong Information on the Label

A label can scan perfectly and still be wrong. The barcode may encode an old SKU, the human-readable text may describe a different variant, or the label may have been printed from an out-of-date file. These errors are worse than a failed scan, because nothing looks wrong. The system records a confident movement of the wrong product, and the mistake only surfaces later as a discrepancy.

Reduce this risk by printing labels from your live product records, not from saved spreadsheets or old label files. When a SKU is retired or a product changes, remove old label stock from the warehouse so it cannot be used by habit. After printing a batch, scan the first and last labels and check that the system shows the product you expect, in the right variant and pack size.

Include a short human-readable product name and the SKU in text under the barcode. This lets staff sanity-check what they are scanning, and lets work continue by manual entry if a scanner fails. Keep the text short but specific enough to separate close variants, such as size or colour.

Inconsistent Labels Across the Warehouse

In many warehouses, every area labels things slightly differently because different people set them up at different times. One aisle uses large shelf labels, another uses handwritten tags, and the overflow area uses supplier cartons with no labels at all. Inconsistency slows staff down because they must work out a new pattern in every location, and it makes counts uneven, with the poorly labelled areas producing most of the errors.

The fix is a short labelling standard, ideally one page, covering label sizes, placement, what information appears, and who may print labels. Apply it area by area as part of normal housekeeping rather than as a giant one-off project. When you prepare for a full count, consistent labels are a major advantage, as described in our guide on how to prepare for a stocktake, because counters can move at a steady pace instead of deciphering each shelf.

Location Labels and Product Labels Getting Mixed Up

Warehouses use two families of barcodes: product barcodes that say what an item is, and location barcodes that say where it is. Trouble starts when the two look identical and sit next to each other. A tired picker can scan the location label instead of the product, or the other way round, and the system records nonsense.

Make the two families visually distinct. Use a different label colour, size, or a clear prefix in the code for locations, and place location labels in a fixed spot that is clearly separate from product labels, such as the rack beam above or the shelf edge below. Train new staff on the difference on their first day, with real examples from your own shelves.

No Process for Replacing and Checking Labels

Even a well-labelled warehouse drifts. Labels fade, get damaged, get covered by new stock, or become wrong when a bin starts holding a different product. Without a checking habit, the number of problem labels grows until scanning feels unreliable everywhere and staff stop trusting barcodes altogether.

Build label care into routines you already have. During cycle counts, the counter checks the labels in the counted area and replaces any that fail. During put-away, staff confirm the bin label matches the product going in. Keep a small stock of blank labels and a working printer accessible, so replacing a label is a one-minute job rather than a request that waits a week. Note repeated damage in the same spot and change the label position or protection there, instead of replacing the same label forever.

A Quick Label Audit You Can Do This Week

Pick one aisle or section and scan every shelf label once, noting any that fail or need a second attempt.
Check ten item labels at random for placement, damage, and a matching product description.
Look for any item showing two scannable barcodes and fix it to your single standard.
Check the printer: print a test sheet, inspect for white lines or fading, and clean or service as needed.
Replace every problem label you found, then repeat the audit in the next section the following week.

This rolling audit fits naturally with general warehouse housekeeping and keeps labelling quality high without a disruptive relabelling project.

Conclusion

Barcode labelling mistakes are rarely dramatic, but their cost is constant: a few seconds and a little accuracy lost on every scan, every pick, and every count. Labels that are big enough, printed sharply, placed consistently, protected from damage, and kept accurate remove that friction. Set a simple standard, audit one section at a time, and replace failing labels on the spot. Your scanners are probably fine. Give them labels worth scanning, and counting and picking will speed up straight away.