Barcode Generator

Understanding the Barcode Generator

The Barcode Generator turns any text or product number into a scannable, print-ready barcode entirely in your browser. Choose from six widely used symbologies — CODE128, EAN-13, EAN-8, UPC-A, CODE39, and ITF-14 — and fine-tune the appearance with adjustable bar width, height, and an optional human-readable caption beneath the bars. The barcode updates live as you type, and if a value doesn't fit the chosen format's rules, you get a clear hint instead of a broken image. When you're happy with it, download a pixel-perfect PNG or a scalable SVG vector. Nothing is ever uploaded — the value you enter stays on your device.

How it works

Pick a barcode format and type your value. The tool uses the JsBarcode engine to encode that value into a pattern of bars and spaces following the chosen standard, drawing the result directly into an SVG element that re-renders on every change. Each format enforces its own rules: numeric-only formats validate length and compute the required check digit automatically. If the value is invalid, the engine reports it and the tool shows a friendly message rather than rendering a faulty code. Download PNG redraws the barcode onto a canvas and exports a raster image, while Download SVG serializes the on-screen vector so it stays sharp at any print size.

Tips & common mistakes

• Use CODE128 when you just need to encode arbitrary text or alphanumeric SKUs — it's the most flexible and compact general-purpose format.
• Match the digit count to the format: EAN-13 needs 12–13 digits, EAN-8 needs 7–8, UPC-A needs 11–12, and ITF-14 needs 13–14. Enter one fewer than the maximum and the check digit is added automatically.
• Download SVG for anything you'll print large — labels, packaging, or signage — because vectors stay perfectly sharp at any size, unlike PNG.
• Keep "show text" enabled so the human-readable number prints under the bars, which helps cashiers and warehouse staff when a scan fails.
• Leave a quiet zone (margin) around the barcode and avoid stretching it too thin — scanners need adequate bar width and white space on both sides to read reliably.
• CODE39 only accepts uppercase letters, digits, and a few symbols (- . space $ / + %); use CODE128 instead if you need lowercase or a wider character set.

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