Why Placement Decides Whether Your Product Sells

A barcode that scans first time is invisible to your customer and priceless to your retailer. A barcode that needs three attempts, or a manual key-in at the till, is a problem the buying team will remember — and it is usually a placement problem rather than a numbers problem.

Most rejects we see on new packaging lines have nothing wrong with the barcode itself. The bars are the right width, the check digit is correct, and the number is properly registered. The issue is that the symbol has been squeezed into a corner, wrapped around a curve, or printed over a fold. Getting placement right takes ten minutes at the artwork stage and saves weeks of reprinting and re-listing later.

The Quiet Zone: The Space That Makes It Work

Every barcode needs clear, unprinted space on both sides. This is the quiet zone, and it is the single most common reason a technically correct barcode fails to scan.

For a standard EAN-13 retail symbol at 100% magnification, allow at least 3.6 mm on the left and 2.3 mm on the right. That is the absolute minimum, and it assumes perfect printing. In practice, give yourself more. A generous quiet zone of 5 mm on both sides costs you nothing in design terms and protects you when print registration drifts slightly across a long run.

The quiet zone must be the same colour as the background behind the bars — usually white — and it must be free of text, borders, logos, promotional flashes and any other printed element. A "New Recipe" burst tucked into the corner beside your barcode will block the scanner just as effectively as a badly printed bar.

Placing the Barcode on the Back of the Pack

For most grocery, health and beauty, and household products, the convention is the lower right-hand quadrant of the back panel, with the bars running vertically (the "picket fence" orientation). This is where scanners, shelf-edge systems and handheld guns expect to find it. Consistency matters more than any single rule: if every product in your range carries its barcode in the same relative position, staff and systems learn it quickly.

• Keep the symbol at least 8 mm from any edge of the panel — more on small packs.
• Keep it 10–12 mm clear of the base, where handling and shelf wear do the most damage.
• Print at the full nominal height of about 26 mm. Truncated barcodes look tidier but are frequently rejected by retailers.
• Never place it across a seam, crimp, fold or perforation.
• Leave it off the base, the lid, and any panel likely to be obscured by a shelf lip or a neighbouring product.

If your packaging only has room for one barcode, the retail symbol takes priority over any internal or warehouse code.

Flat Panels, Curves and Awkward Shapes

Barcodes need a flat surface. On a bottle, jar or tube, place the symbol on the flattest label panel available and keep the whole symbol within it. As a working rule, the arc the barcode spans should not exceed about 30 degrees of the container's circumference; beyond that, the bars appear to vary in width to the scanner and the read rate drops sharply.

If your pack is small or heavily curved, consider a flat label applied to a flat area, a wraparound label with a dedicated flat window, or simply moving up to a larger pack format. Avoid applying a label over a lid edge or a shrink-sleeve join, where the film can distort as it shrinks and pull the bars out of shape.

Colour, Contrast and Print Quality

Scanners read contrast, not colour. Dark bars on a light background is the only safe combination for retail. Specifically:

• Use black, dark blue, dark green or dark brown bars on white or a very pale tint.
• Avoid red bars on white, and avoid red backgrounds entirely — most laser scanners see red as white, so the symbol effectively disappears.
• Avoid metallic, foiled, holographic and highly reflective substrates, which bounce light straight back at the scanner.
• Avoid matt black bars on a glossy background, and check that no varnish or laminate sits over the symbol.

Print quality matters as much as placement. Aim for crisp, sharp edges and no ink spread between the bars — a slight gain on a wet-printed label can close a narrow bar completely and turn a scannable symbol into a guessing game.

Testing Before Your First Delivery

Do not rely on a phone app or the scanner at your local shop. Both tell you a barcode works in a friendly environment, not that it will pass a retailer's goods-in check.

Test on the finished pack, not the flat artwork. A bottle filled with liquid, a bag under tension and a carton with a folded flap all behave differently from a PDF on a screen. Scan from a range of angles and distances, in low light and in bright light, and check the symbol again after the pack has been handled, chilled or stacked.

Where you can, ask a barcode verification service to grade the printed symbol. A verification report gives you a number rather than an opinion, and it is far cheaper than a rejected pallet. Finally, read your retailer's packaging manual before artwork sign-off — a handful of them specify exact barcode positions, sizes and clearances that differ from the general conventions above, and those requirements always win.