Code 128 vs Code 39: which barcode should you use?

Density and character set

Code 128 encodes the full ASCII set more densely, so labels stay smaller for the same payload. Code 39 is limited to uppercase letters, digits, and a small symbol set.

For new logistics systems, Code 128 is usually the better default. Keep Code 39 when partners or legacy scanners require it.

Try both generators

Use Inkode’s Code 128 and Code 39 format pages to validate sample values and download print-ready assets before committing a warehouse standard.