Is a GTIN the same as a barcode?

No. A GTIN is a number; a barcode is the visual pattern that encodes that number. A product can have a GTIN without a barcode printed on it, and a barcode can encode data other than a GTIN.

Can I use the same barcode type for every product?

You can, but it may not be ideal. Internal inventory and warehouse use usually benefit from Code 128. Retail products sold through external stores need UPC-A or EAN-13. QR codes are best when customers scan with smartphones.

What is the difference between 1D and 2D barcodes?

1D (linear) barcodes store data in horizontal bar patterns; they are read by laser scanners and usually hold short identifiers. 2D barcodes store data in both directions; they hold more data and can be read by cameras, including smartphone cameras.

Why does my barcode fail to scan?

Common causes include: missing quiet zone, low contrast, damaged print, wrong check digit, printing below the minimum size, or scanning at the wrong angle.

Do I need GS1 membership to make barcodes?

Only for retail products that need a globally unique GTIN. For internal inventory, asset tracking, or shipping labels, you can generate Code 128 or other non-retail barcodes without GS1 registration.

Barcode Glossary

A plain-English reference for the barcode terms you will encounter when choosing a format, designing labels, or setting up inventory workflows. Use this page to answer quick questions before moving to a generator or guide.

Barcode

A machine-readable visual representation of data. A barcode scanner converts the pattern of bars and spaces (or dots, for 2D codes) back into the original value.

Barcode symbology

A specific encoding standard that defines how characters are represented as bar and space patterns. Common examples include Code 128, UPC-A, EAN-13, Code 39, and QR Code.

Barcode type

The name of the symbology chosen for a particular label — for example, Code 128, UPC-A, or QR Code. Different types are suited to different data and scanning environments.

GTIN (Global Trade Item Number)

GS1’s umbrella term for product identifiers: GTIN-12 is a UPC-A, GTIN-13 is an EAN-13, and GTIN-14 is used for cases or multipacks. GTINs are unique worldwide when properly registered.

UPC-A

A 12-digit retail barcode standard used primarily in North America. The last digit is a check digit calculated from the first 11 digits.

EAN-13

A 13-digit retail barcode standard used internationally. Adding a leading zero to a UPC-A produces an equivalent EAN-13.

Code 128

A high-density linear barcode that encodes any ASCII character. It is the most common choice for internal inventory, logistics, and warehouse labels because it requires no registration.

Code 39

A legacy alphanumeric barcode that supports uppercase letters, digits, and a limited set of symbols. Less dense than Code 128; use only when a legacy system requires it.

QR Code

A two-dimensional matrix barcode that stores data in both horizontal and vertical directions. It can encode URLs, long text, and contact information, and is readable by most smartphone cameras.

Quiet zone

The blank margin required on either side of a linear barcode. The quiet zone gives the scanner room to detect the start and end of the barcode pattern. Without it, scan failures increase.

Check digit

A calculated final digit used to catch transcription errors. UPC-A and EAN-13 barcodes include a modulo-10 check digit. If the check digit is wrong, the barcode is invalid.

Barcode density

The amount of data encoded per unit of barcode width. High-density symbologies (like Code 128) fit more characters into a smaller space than low-density symbologies (like Code 39).

Human-readable text

The plain-text version of the barcode value printed beneath or beside the barcode symbol. It lets staff read the value when a scanner is unavailable or the barcode is damaged.

X-dimension

The width of the narrowest bar or space in a linear barcode. Smaller X-dimensions create more compact symbols but require higher-resolution printers and better scanners.

Magnification

The scaling factor applied to a barcode relative to its nominal size. GS1 specifies UPC-A and EAN-13 can be printed from 80% to 200% of the nominal size. Below 80%, scanning reliability drops.

GS1

The global organisation that manages barcode standards for retail and supply chains. GS1 assigns company prefixes and publishes specifications for UPC-A, EAN-13, and GS1-128.

Application Identifier (AI)

A prefix used in GS1-128 barcodes that tells the scanner what the following data means — for example, (01) for GTIN, (10) for batch/lot, and (17) for expiry date.

SKU (Stock Keeping Unit)

An internal identifier a business assigns to each product variant. Unlike a GTIN, a SKU is not globally unique and does not need GS1 registration.

DPI (dots per inch)

The print resolution of a printer or image. A 300 DPI image has 300 pixels per inch. Higher DPI printers produce smoother bar edges at small X-dimensions.

Thermal transfer

A printing method that uses heat to melt ink from a ribbon onto label material. It produces durable, long-lasting labels suitable for warehouses and outdoor use.

Barcode type quick reference

Format	Best for	Data it can encode
Code 128	Internal inventory, logistics, warehouse	Any ASCII text
UPC-A	Retail products in North America	12 digits
EAN-13	Retail products internationally	13 digits
QR Code	URLs, smartphone scanning, long text	Up to 4,296 alphanumeric chars
Code 39	Legacy healthcare, defence, industrial	Uppercase + digits + limited symbols

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