Barcode Comparison

Code 128 vs Code 39: What's the Difference?

Code 128 and Code 39 are both widely used linear barcode formats, but they suit different workflows. The right choice depends on the characters you need to encode, the available space, and the scanner or system that must read the barcode.

Code 128

Code 128 is a high-density barcode symbology commonly used for logistics, shipping, inventory, and other business data. It supports a broad character set and can represent data efficiently in relatively limited space.

Use the Code 128 Barcode Generator when your workflow requires Code 128.

Code 39

Code 39 is an established alphanumeric barcode format used in applications such as inventory, manufacturing, and identification. It is straightforward and widely supported, but it generally uses more physical space than Code 128 for comparable data.

Use the Code 39 Barcode Generator when your system specifically calls for Code 39.

Code 128 vs Code 39

Which barcode should I use?

If a retailer, carrier, warehouse, ERP, POS, or other system specifies a symbology, follow that requirement. If you control the system, consider the amount of data, physical label space, scanner compatibility, and the conventions already used by your workflow.

Frequently asked questions

Is Code 128 better than Code 39?

Not universally. Code 128 is often more compact and flexible, while Code 39 remains useful where existing systems or specifications require it.

Can Code 128 and Code 39 encode the same data?

Some values can be represented in both formats, but the resulting barcode symbols and encoding rules are different. Always use the symbology expected by the system that will scan the barcode.

Can I create both barcodes online?

Yes. BarcodeYard provides separate Code 128 and Code 39 generators.