Code 128 vs EAN-13

Generate both formats in the barcode generator. Download PNG for quick use or SVG for print.

Code 128

Code 128 can encode letters, numbers, and many symbols. It is the usual choice for internal inventory, shipping cartons, asset tags, and membership IDs. There is no GS1 prefix requirement. Keep the value reasonably short so the bars stay wide enough on a small label.

EAN-13

EAN-13 is a 13-digit retail product code used internationally. The last digit is a check digit calculated from the first twelve. This site validates that checksum so you do not print a number that scanners reject. Use EAN-13 when you already have a GS1 number, or when you need to match an existing product barcode.

UPC-A

UPC-A is 12 digits and is common in North America. Many scanners treat a UPC as EAN-13 with a leading zero. If you have a 12-digit UPC, enter it with a leading 0 on the EAN-13 tab (or enter 12 digits and let the check digit complete an EAN). For internal codes that will never hit a retail POS, prefer Code 128.

Print height

1D barcodes need enough bar height for a laser or camera to get a clean swipe. If a scan fails, increase height before you shrink the width. Quiet space (margin) on both sides of the bars is as important as contrast.