How to Print Barcode Labels Yourself (That Actually Scan)

You've got your EAN codes, the stock has arrived, and the packaging didn't come with a barcode printed on it. Now 400 jars need a label by Friday. Learning how to print barcode labels yourself is straightforward, but a few millimetres and one wrong file format are the difference between a label that beeps first time and one a till operator has to key in by hand.

The short version: generate a vector barcode, keep it between 80 and 200 per cent of the nominal size, match the bar width to your printer's dots, and test-scan a sample before the full run. Here's how to get each step right.

Step 1: generate the barcode as a vector file

Start with the number, not the image. Run each code through our EAN checker so you're not printing 400 labels with a typo. Then create the image with the barcode generator.

The file format matters more than most people expect:

Vectors scale without losing sharp edges. A PNG made for a screen can look fine on your monitor and still print with fuzzy bars, because the printer has to stretch the pixels.

Step 2: get the size right

GS1 defines the nominal EAN-13 at 100 per cent magnification with an X-dimension of 0.330 mm. The X-dimension is the width of the narrowest bar, and everything else in the barcode is a multiple of it.

At 100 per cent, an EAN-13 is 37.29 mm wide including the quiet zones (the blank margins on each side). The GS1 symbol reference allows magnifications from 80 to 200 per cent. GS1 UK's sizing table shows how the bars scale:

Bar heights exclude the digits underneath. The 80 per cent X-dimension follows from 80 per cent of 0.330 mm. The quiet zones are part of the barcode: for an EAN-13 they are 11 modules wide on the left and 7 on the right, so at 100 per cent that's roughly 3.6 mm and 2.3 mm of blank space.

Width 37.29 mmHeight 25.93 mm

Quiet zone

• 80 % minimum29.83 mm × 20.74 mm
• 100 % (nominal)37.29 mm × 25.93 mm
• 200 % maximum74.58 mm × 51.86 mm

Step 3: how to print barcode labels on thermal or office printers

Thermal label printers

Thermal printers are the standard choice for product labels. They come in two types:

• Direct thermal prints on heat-sensitive labels, with no ink or ribbon. Cheap to run, but the labels fade with heat and sunlight over time. Fine for shipping labels and fast-moving stock.
• Thermal transfer melts ink from a ribbon onto the label. It lasts much longer, so it suits products that sit in a warehouse or on a shelf for months.

Both print in rolls, one label at a time, so you don't waste half a sheet when you only need seven.

Laser and inkjet printers

An ordinary office printer with A4 label sheets works well for small batches. Laser toner gives crisper edges than inkjet. With inkjet, use matt labels made for inkjet printers, because ink spreads on the wrong paper and fattens the bars.

Step 4: match the bars to your printer's dots

This is the step most guides skip, and it's why some home-printed barcodes fail even at the "right" size.

A printer can only print whole dots. Zebra's specifications give a nominal dot size of 0.125 mm at 203 dpi and 0.084 mm at 300 dpi. A nominal 0.330 mm module would need 2.64 dots at 203 dpi. The printer can't do that, so it rounds some bars down and others up, and the bars come out uneven.

The fix is to choose a size where the module is a whole number of dots:

These figures are worked out from the printer's dot size: dots × (25.4 mm ÷ dpi). Good label software has a setting for "module width in dots" or snaps the barcode to the printer grid. Use it.

Worked example: 400 jar labels on a 203 dpi printer

Suppose your number is 5060123456028 and you're printing on a 203 dpi direct thermal printer.

1. Set the module to 3 dots (0.375 mm), roughly 114 per cent.
2. The barcode is now about 37.29 × 1.137 ≈ 42.4 mm wide including quiet zones, and about 26 mm of bar height.
3. With the digits underneath, the whole symbol is about 29.5 mm tall, so a 50 × 35 mm label leaves a margin all round.
4. If your jar only takes a 40 mm wide label, drop to a 300 dpi printer at 4 dots (about 103 per cent, roughly 38.3 mm wide) rather than squashing the barcode on the 203 dpi machine.

1. Validate the numberRun every EAN through the checker before you design anything.
2. Generate a vectorExport SVG or PDF, not a stretched screen image.
3. Snap to printer dotsChoose a module width in whole dots for your dpi.
4. Print one test labelUse the real label stock and real printer settings.
5. Scan, then print allTest with a phone and, ideally, a handheld scanner.

Step 5: test-scan with your phone

Before you print the full run, print one label and scan it. A phone camera app or a free barcode-scanning app will read EAN-13s. Check two things:

• It scans quickly from a normal distance, without you hunting for the right angle.
• The decoded number matches the 13 digits printed under the bars.

A phone is more forgiving than a supermarket till scanner, so a phone read is the minimum. If you have access to a handheld laser scanner, try that too. If a label only scans on the third attempt with your phone, it will fail at a till.

Common print faults and how to fix them

When to hand it to a professional printer

Printing labels yourself is ideal for short runs, new products and mixed batches. For tens of thousands of identical labels, or barcodes printed straight onto boxes and pouches, a professional label printer or packaging printer is usually cheaper per unit and gives you a print-quality check. Send them a vector file and the magnification you want, and ask them to confirm the X-dimension on proof.

Supermarkets and larger retailers may also have their own barcode quality requirements. If you're heading into big retail, you'll typically need GS1-licensed numbers in any case, so check both the numbering and the print specification with the buyer before you order.

What to do now

• Validate every number with the EAN checker.
• Generate SVG or PDF files with the barcode generator.
• Pick a size between 80 and 200 per cent, with the module snapped to whole printer dots.
• Print one label, test-scan it on the real product, then print the batch.
• Unsure whether your range needs more numbers first? Read when you need a new EAN.