You have approved the packaging. Thousands of labels have been printed. The cartons are ready to leave.
Then somebody scans the barcode.
Nothing happens.
They try again. Still nothing.
For a product business, this is the kind of small-looking problem that can become expensive very quickly.
The good news is that a barcode that does not scan is not always caused by the barcode number itself. Quite often, the problem is introduced when the barcode moves from a digital file onto real packaging.
Its size may have been changed. The designer may have removed the blank space around it. The printer may have produced poor contrast. Or the barcode may have been placed across a curve, fold or reflective surface.
If your EAN-13 barcode is not scanning reliably, here are nine practical things worth checking before you blame the scanner.
First: A Barcode Number and a Printed Barcode Are Not the Same Thing
This distinction is surprisingly important.
An EAN-13 number is the 13-digit identifier. The familiar pattern of black bars and white spaces is the machine-readable representation of that number.
That means you can have a correctly structured EAN-13 number but still end up with a poorly printed barcode that is difficult for a scanner to read.
Think of it this way:
The number can be correct while the physical barcode is wrong.
This is why testing the final printed packaging matters.
1. The Barcode Has Been Made Too Small
Packaging designers are always fighting for space.
The logo needs room. Ingredients need room. Regulatory information needs room. Marketing claims need room. Suddenly the barcode is treated as the thing that can simply be squeezed into whatever space remains.
That can cause problems.
Barcode dimensions are not arbitrary. Making a barcode excessively small reduces the width of its bars and spaces, making it more difficult for scanning equipment to distinguish them reliably.
A common mistake is to drag the corner of a barcode image in design software until it "looks about right."
Don't treat a retail barcode like a decorative graphic.
Before finalising packaging, make sure its dimensions are appropriate for the barcode type, printing process, packaging material and intended scanning environment.
2. The Barcode Has Been Stretched or Distorted
This one often happens accidentally.
A designer receives the barcode artwork and needs it to fit a narrow space. Instead of resizing it proportionally, the image is stretched horizontally or compressed vertically.
Visually, it may still look like a barcode.
Technically, however, its proportions have changed.
EAN/UPC barcode dimensions have defined relationships. Arbitrarily stretching or squeezing the artwork can interfere with the scanner's ability to interpret the pattern correctly.
When resizing barcode artwork, preserve its proportions and work within the applicable size specifications rather than reshaping it to fill a design box.
3. The Bars Have Been Cut Too Short
Another tempting design shortcut is reducing the barcode's height.
The thinking usually goes something like this:
"We don't have enough room, so we'll just make the bars shorter."
It may save a little packaging space, but it can make scanning less forgiving.
Reducing the height of an EAN/UPC symbol is commonly referred to as truncation. It should not be treated as a normal way to make a barcode fit your packaging.
A barcode with adequate bar height gives retail scanning equipment more opportunity to capture the symbol during normal movement at the checkout.
This matters especially with omnidirectional point-of-sale scanners, where nobody is carefully lining up the scanner with every individual bar.
4. There Is Not Enough Blank Space Around the Barcode
Those empty areas beside a barcode are not wasted packaging space.
They have a job.
They are commonly called quiet zones.
A scanner needs sufficient clear space around the symbol to recognise where the barcode begins and ends.
A designer may unknowingly place:
- text too close to the barcode,
- a border around it,
- an illustration beside it,
- a coloured design element against it, or
- another packaging feature inside the required clear area.
The result can be a beautiful design and an unreliable barcode.
When you hand barcode artwork to your packaging designer, make it clear that the surrounding clear area is part of the barcode's functional space.
5. The Barcode Colours Look Good but Scan Poorly
Brand guidelines can create another problem.
Imagine a premium cosmetics brand with soft pastel packaging. The designer decides that a conventional dark barcode looks too harsh, so the bars are changed to a subtle colour that matches the rest of the box.
It looks elegant.
The scanner may disagree.
Barcode readability depends partly on sufficient contrast between the bars and the background.
For this reason, strong dark bars on a light background are generally the safest visual approach.
Do not assume that because two colours look different to the human eye, a scanner will interpret them equally well.
This becomes even more important when ink, packaging material, lamination and the actual printing process change how the finished colours appear.
6. The Packaging Surface Is Glossy, Transparent or Reflective
Your barcode does not exist in Photoshop.
It exists on a physical product.
That difference matters.
A barcode printed perfectly on ordinary white paper may behave differently when printed on:
- glossy laminated packaging,
- transparent film,
- metallic material,
- wrinkled pouches,
- textured surfaces, or
- highly reflective labels.
Reflection, transparency, wrinkles and inconsistent surfaces can all affect the scanning environment.
For transparent packaging in particular, think about what will physically appear behind the barcode after the product is filled. A barcode that appears against a clean background in the artwork may eventually sit over a changing product colour.
The safest approach is to evaluate the barcode on the actual finished packaging material, not only on a computer screen or office printout.
7. The Barcode Is Wrapped Around a Bottle or Curved Pack
Bottles, jars, cans and tubes create their own challenge.
Place a wide barcode across a tight curve and part of the symbol can begin disappearing around the side of the container from the scanner's point of view.
That is very different from scanning the same barcode on a flat cardboard box.
Barcode orientation and size therefore deserve special attention on curved packaging.
If your product uses a bottle, jar, tube or other cylindrical container, involve your packaging designer and printer early rather than adding the barcode as the final step.
A few millimetres of placement difference can matter much more on a small curved container than on a large flat carton.
8. The Barcode Is Too Close to a Fold, Seam or Edge
Here's a scenario we see too often in packaging workflows.
The artwork file looks perfect when it is flat.
Then the package is manufactured.
The barcode ends up close to a fold. A flap partially covers it. A pouch seam runs through its clear area. A label bends around an edge. Or shrink wrapping creates distortion across the bars.
This is why barcode placement needs to be considered in relation to the finished package, not merely the flat artwork template.
Before approving production, ask:
- Will this area remain flat?
- Could a fold reach the barcode?
- Will a seam cross it?
- Could another label cover it?
- Will wrapping distort it?
- Can the scanner physically reach this area?
A technically correct barcode placed in the wrong location can still become a scanning problem.
9. Nobody Tested the Final Printed Product
This may be the most avoidable mistake of all.
A barcode was checked on the computer, so everyone assumes the job is finished.
But your customer will not scan the Illustrator file.
Your retailer will scan the printed package.
Print processes introduce variables. Ink can spread. Fine bars can lose definition. Packaging can distort. Colours can change. Lamination can create reflections. Flexible material can wrinkle.
So before approving a large production run, produce a physical sample using the same—or as close as possible to the same—printing method and material intended for production.
Then test it.
A Simple Pre-Print Barcode Checklist
Before telling your printer to produce 10,000 boxes, run through this checklist:
- Is the EAN-13 number correct?
- Has the barcode artwork been kept in proportion?
- Is the barcode large enough for its intended application?
- Has the bar height been preserved?
- Is there adequate clear space around the symbol?
- Is there strong contrast between the bars and background?
- Is the barcode away from folds, seams and package edges?
- Has curvature been considered for bottles, jars and tubes?
- Has the barcode been tested on the actual packaging material?
- Has a production-quality sample been checked before mass printing?
That five-minute review can be considerably cheaper than discovering a problem after the packaging has been manufactured.
Can I Test a Barcode With My Phone?
A smartphone can be useful for a quick basic check, but don't confuse a successful phone scan with professional barcode verification.
If your phone reads the barcode, that tells you something useful: the symbol can be decoded under those particular conditions.
It does not prove that the printed barcode meets every applicable quality requirement or will perform reliably across retail scanning environments.
For applications where barcode quality is commercially critical, proper barcode verification equipment and applicable verification standards should be considered.
This distinction becomes particularly important when you are producing packaging at scale.
Check the Number Before You Check the Print
If a barcode is giving you trouble, start with the basics.
Confirm that the 13-digit number itself has a valid EAN-13 structure and check digit.
YesBarcode provides a free online barcode verification tool that can check the structure and recalculate the check digit of a 13-digit EAN-13 number.
Verify an EAN-13 barcode number with YesBarcode.
Remember, however, that checking the number and checking print quality are two different jobs.
A valid number can still be represented by a badly printed barcode.
What Should You Send Your Packaging Designer?
Try not to send a screenshot of a barcode taken from an email or spreadsheet.
Use proper barcode artwork.
For example, YesBarcode currently provides EAN-13 orders with high-resolution JPG barcode images and scalable SVG files, along with an Excel list of the barcode numbers.
For packaging design, a scalable vector file can be particularly useful because the designer can place clean artwork into the packaging layout without relying on a low-resolution screenshot.
You should also keep a master record showing which EAN-13 number has been assigned to each product variant.
One small spreadsheet can prevent a surprisingly large number of future mistakes.
Don't Reuse a Barcode Just Because the Old Product Is Gone
There is another type of barcode problem that has nothing to do with scanning.
Suppose you discontinue Product A.
A year later, somebody in the office notices its old barcode number in a spreadsheet and thinks:
"We're not using this anymore. Let's put it on Product B."
That is exactly the kind of shortcut that can create identification problems across catalogues, retailers, inventory records and historical data.
Barcode assignment should be managed as product data, not treated like recycling unused label artwork.
Keep a clear master list of active, discontinued and assigned numbers so your team knows what has already been used.
When Should You Check the Barcode During Packaging Design?
Ideally, not five minutes before the artwork goes to print.
A better workflow is:
- Confirm the product and its individual sellable variant.
- Confirm the appropriate product identifier for your intended sales channel.
- Assign the barcode number.
- Add the correct barcode artwork to the packaging layout.
- Check size, proportions, quiet zones, contrast and placement.
- Create a physical packaging proof.
- Test the printed barcode.
- Correct any problems.
- Approve mass production only after the final proof is satisfactory.
This workflow may feel slightly slower before printing.
It can be dramatically faster than reprinting packaging afterwards.
Real-World Example: The Barcode That Worked on Paper but Not the Pouch
Imagine a small snack brand preparing its first retail launch.
The designer creates an attractive flexible pouch. The EAN-13 barcode scans from the office printout, so the team approves the artwork.
But the production pouch uses glossy flexible material.
Once filled, the barcode sits on an uneven part of the pack. Light reflects from the surface and the material wrinkles slightly across the symbol.
The number itself hasn't changed.
The barcode file hasn't changed.
What changed is the environment in which the barcode has to be scanned.
Had the business tested one finished production sample before approving the full run, it could have adjusted the position, background or packaging layout before thousands of pouches were printed.
That is why barcode testing belongs in the packaging process, not just the barcode-purchasing process.
Frequently Asked Questions
Why is my EAN-13 barcode not scanning?
Common causes include insufficient contrast, incorrect size, distorted artwork, reduced bar height, inadequate quiet zones, poor print quality, reflective packaging, wrinkles, damage or unsuitable placement on curved surfaces.
Can an EAN-13 number be valid but the barcode still fail to scan?
Yes. The underlying number and the physical printed symbol are separate considerations. A valid number can still be represented by a barcode with poor dimensions, contrast, placement or print quality.
Can I resize an EAN-13 barcode?
Barcode symbols can be produced within applicable size ranges, but they should not simply be stretched, squeezed or resized arbitrarily. The printing process, packaging material and scanning environment should be considered.
What is the blank space around a barcode?
The clear areas beside a barcode are known as quiet zones. They help scanning equipment distinguish the barcode from surrounding graphics and other packaging elements.
Can I shorten the bars to make my barcode fit?
Reducing the height of an EAN/UPC barcode is known as truncation and can reduce scanning performance. It should not be used simply as a convenient way to make the barcode fit a design.
Can I print a barcode on a bottle?
Yes, but curved surfaces require careful consideration of barcode size, orientation and placement. A barcode that wraps too far around a tight curve can become difficult for a scanner to see completely.
Should I test my barcode before printing packaging?
Yes. Test a physical sample made from the intended packaging material before committing to a large production run. Digital artwork alone cannot reveal every printing, surface, reflection or placement problem.
Does scanning a barcode with my phone prove it is print-quality compliant?
No. A successful phone scan is a useful practical test, but it is not the same as formal barcode verification using appropriate verification equipment and standards.
Where can I check an EAN-13 barcode number?
You can use the free YesBarcode barcode verification tool to check whether a 13-digit number has a valid EAN-13 structure and check digit.
Final Thoughts
A barcode is tiny compared with the rest of your packaging, but it can affect what happens to that product at the warehouse, retail counter and inventory system.
So don't leave it until the end.
Give the barcode enough space. Preserve its proportions. Think about the packaging material. Keep it away from folds and seams. Pay attention to curved surfaces. And most importantly, test the actual printed product before approving mass production.
If you're preparing a new product range and need EAN-13 barcodes, YesBarcode offers packages for different catalogue sizes with barcode numbers, JPG and SVG files, an Excel list and dashboard access.
View YesBarcode EAN-13 barcode packages.
Get the number right. Get the print right. Then let the barcode do its job.