Which format should I use?

Code 128 is the most versatile and supports all printable ASCII characters. EAN-13 and UPC-A are standard for retail products and require numeric-only input. ITF-14 is used for shipping cartons.

Why does EAN-13 need exactly 12 or 13 digits?

EAN-13 encodes 12 data digits plus one check digit. If you enter 12 digits the check digit is calculated automatically. If you enter 13 the last digit is validated against the calculated check digit.

Can I use Code 39 with letters?

Yes. Code 39 supports uppercase letters A–Z, digits 0–9, and a small set of special characters: space, -, ., $, /, +, %.

Is my data sent to a server?

No. All encoding and rendering happens entirely in your browser using JavaScript. Nothing is transmitted to any server.

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Barcode Generator

Generate barcodes in Code 128, Code 39, EAN-13, UPC-A, and ITF-14 formats and download as SVG or PNG.

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About this tool

Create standard barcodes instantly in your browser with no server required. Supports Code 128, Code 39, EAN-13, UPC-A, and ITF-14 formats with pure-JS encoding and SVG rendering. The tool calculates check digits automatically and lets you download the result as a vector SVG or a raster PNG.

How to use

1 Select the barcode format from the dropdown (e.g. Code 128, EAN-13).
2 Type the value you want to encode in the input field.
3 The barcode renders instantly as an SVG image below the form.
4 Click 'Download SVG' or 'Download PNG' to save the barcode file.

Frequently Asked Questions

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