Barcode Generator

What is a barcode?

A barcode is a machine-readable pattern of bars and spaces (or squares, for 2D codes) that encodes data such as a product number. A scanner reads the pattern and looks the number up in a database. This generator creates the common retail and logistics formats, including EAN-13, UPC-A, Code 128, Code 39, ITF, Data Matrix, and PDF417, with automatic checksums and PNG or SVG download.

Choosing the right format

• EAN-13 / UPC-A: retail product codes. UPC-A (12 digits) is used in North America; EAN-13 (13 digits) is the international standard. They are essentially the same system.
• Code 128: a compact, high-density format for shipping and logistics that encodes letters and numbers.
• Code 39: an older alphanumeric format common in industrial and ID applications.
• Data Matrix / PDF417: 2D codes that pack much more data into a small space, used on labels, IDs, and tickets.

What is a checksum digit?

Many barcodes include a final check digit calculated from the other digits. The scanner recomputes it and compares, so a misread is caught rather than silently accepted. This tool calculates the correct checksum automatically, so the codes you generate are valid and scannable.

Getting an official product barcode

This tool draws a valid barcode for any number you enter, which is perfect for internal use, testing, labelling, and inventory. However, to sell a product through retailers you need a globally unique number issued by GS1, the organisation that licenses official UPC and EAN numbers. Generate freely for your own systems, but obtain a registered number before listing a product for retail sale.