Barcode Generator

Generate Code 39 barcodes from text and download as PNG

What is it and how does it work?

Barcodes encode data — numbers, text, or URLs — in a pattern of lines or dots that scanners and smartphone cameras can read instantly. The right format depends on your use case: Code 128 handles all ASCII characters and is the default for shipping and logistics; Code 39 is the oldest and widely supported in industrial settings; EAN-13 and UPC-A are the standard retail product codes; QR codes store URLs and are ideal for consumer marketing since every phone camera reads them.

This generator creates barcode images you can download as PNG or SVG and print on labels, embed in documents, or place on packaging. For retail product codes (EAN/UPC), a GS1-issued barcode number is required for legitimate commerce — this tool can generate the visual but obtaining a legal EAN/UPC for retail sale requires registration with GS1. For internal use, logistics, and non-retail applications, any numeric or alphanumeric string can be used.

Common use cases

• Asset tracking: generate Code 128 barcodes for equipment labels in an office or warehouse with internal asset numbers like "ASSET-00142".
• Shipping label: produce a Code 128 or GS1-128 barcode for a custom shipping label when integrating with a courier API that returns a tracking number.
• Event ticketing: embed a unique numeric barcode per ticket to enable quick scan-in at the door with a standard barcode scanner.

Frequently asked questions

What is the difference between 1D and 2D barcodes?

1D barcodes (Code 128, Code 39, EAN, UPC) encode data in a single horizontal pattern of bars and spaces — scannable only in one axis. 2D barcodes (QR codes, Data Matrix, PDF417) encode data in a 2D pattern of dots or squares — holding much more data and readable even if damaged up to 30% (QR Level H).

Which barcode format should I use for product packaging?

Retail products sold in stores require EAN-13 (international) or UPC-A (North America). These require a GS1-issued company prefix. For internal warehouse/logistics use, Code 128 or GS1-128 is standard. For consumer-facing URLs and marketing, QR codes are the modern choice.

Why does my barcode fail to scan?

Common causes: too small (minimum quiet zones on each side must be maintained), too low contrast (black on white is required for most scanners), damaged printing, or wrong barcode type for the scanner. Always test with multiple devices before printing in bulk.

Can I customise the colour of the barcode?

Technically yes, but scan reliability drops with low-contrast colour choices. The industry standard is black bars on a white background. Dark bars on a light-coloured background can work if the contrast ratio is sufficient. Never use a dark background — scanners read the white gaps, not the bars.

Utility

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