Barcode Generator — Free Code 128 Barcode Maker Online

1. Enter your data

Text or numbers

Show text

Code 128B supports printable ASCII characters only (space through ~). Unsupported characters were removed.

2. Your barcode — updates as you type

Tip: barcodes are generated live — just edit the text above and download when it looks right.

How to use this barcode generator

Type any text or number into the input — letters, digits, spaces and common punctuation are all supported.
The Code 128 barcode redraws instantly as you type, so you always see the final result.
Toggle Show text to display or hide the human-readable label under the bars.
Click Download PNG to save a high-resolution image ready for labels, packaging or documents.

What is Code 128?

Code 128 is a high-density linear barcode symbology used worldwide in shipping, logistics, inventory and retail (for example on GS1-128 shipping labels). It can encode all 128 ASCII characters and uses a built-in checksum digit, so scanners can verify the read is correct. Each character is drawn as a pattern of bars and spaces measured in modules — this tool implements Code 128 subset B, which covers the full printable ASCII range (space through ~).

The barcode is built locally in your browser: a start character, your data characters, a modulo-103 checksum, and the stop pattern are converted to module-width tables, then painted onto a canvas bar by bar. The result is a standards-compliant Code 128B symbol that any common barcode scanner or phone app can read.

FAQ

Is this barcode generator free? Yes, completely free with no sign-up and no limits. Generate and download as many barcodes as you like.

Can I use the generated barcodes commercially — will they scan? Yes. The output follows the Code 128B standard with a proper checksum, so it scans with ordinary laser scanners, CCD readers and smartphone apps. When printing, keep the bars dark on a light background and leave quiet zones (blank margins) on both sides for reliable reads.

Is my data uploaded or stored anywhere? No. Everything runs locally in your browser — nothing you type is ever sent to a server, and no account is needed.

Which characters are supported? Code 128B covers printable ASCII: upper- and lowercase letters, digits, space, and punctuation such as -, ., / and _. Accented characters, emoji and control characters are not encodable and will be flagged.