Online barcode generator: EAN-13, Code 128 and more

Create barcodes online for free: EAN-13, EAN-8, Code 128, Code 39, QR. PNG/SVG download.

Published on January 14, 2026

Barcodes are essential for inventory management, logistics, retail and product labeling. Generating a barcode online allows creating labels without dedicated software, to prototype a product, test a scanning system or generate internal labels.

Understanding the conversion

There are many barcode symbologies depending on use cases. EAN-13 (European Article Number) is the global standard for consumer goods sold in stores: 13 digits including a check digit. Code 128 is versatile and compact, used in logistics and supply chain. Code 39 is readable by all scanners but less dense. QR Code is the most widespread 2D format, capable of encoding URLs, text and complex data.

📐 Formula

EAN-13 check digit = 10 - [(weighted sum of first 12 digits) mod 10]

📊 Conversion table

Symbology	Encoded data	Main use	Length
EAN-13	13 digits	Consumer goods	Fixed
EAN-8	8 digits	Small products	Fixed
Code 128	Full ASCII	Logistics, parcels	Variable
Code 39	A-Z, 0-9, symbols	Industry, healthcare	Variable
ITF-14	14 digits	Boxes, cartons	Fixed
QR Code	Up to 4,296 chars	URLs, text, contacts	Variable

💡 Practical examples

Example 1: create an EAN-13 barcode for a product

Enter your first 12 digits (first 3 = GS1 country prefix, e.g. 000 for US). The tool automatically calculates the check digit and generates the EAN-13. Minimum print size: 37.29 × 26.26 mm.

Example 2: Code 128 for warehouse labels

Encode your internal reference number (e.g. REF-2025-001234) in Code 128. Print on Dymo or Zebra labels. Scan with any laser reader or smartphone camera.

Example 3: verify barcode readability

After generation, always test the barcode with a physical scanner or mobile app (Barcode Scanner, Cognex) before launching a mass print run.