How to use: Code 128 Barcode Generator

Code 128 Barcode Generator is a free online barcode tool that encode full ASCII text, serial numbers and tracking codes in the compact, high-density Code 128 symbology with automatic subset switching instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server.

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Description

Encode full ASCII text, serial numbers and tracking codes in the compact, high-density Code 128 symbology with automatic subset switching.

  • barcode
  • Because everything is computed client-side, Code 128 Barcode Generator is safe to use with sensitive data such as API keys, tokens or private logs.
Input Code 128 Barcode Generator Output Runs 100% in your browser — your data never leaves your device.
Code 128 Barcode Generator — Input → Output

How to use

Using Code 128 Barcode Generator takes three steps:

  1. Paste your data into the input box (or load the example).
  2. Configure the options to match your target format or scenario.
  3. Copy, download or inspect the output — it updates live as you type.
How to use · Code 128 Barcode Generator 1 Paste your data intothe input box (or loadthe example). 2 Configure the optionsto match your targetformat or scenario. 3 Copy, download orinspect the output —it updates live as youtype.
How to use

Run

Examples

Serial numbers with letters, digits and dashes — CODE 128 switches subsets automatically.

Input

SN-2026-0925-XYZ

Output

<div class="bc-out" style="text-align:center"><svg aria-bc-name="code128" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 442 142" width="442" height="142" class="bc-svg" role="img" aria-label="CODE128 barcode: SN-2026-0925-XYZ" shape-rendering="crispEdges" style="max-width:100%;height:auto"><rect x="0" y="0" width="442" height="142" fill="#ffffff"/><g fill="#000000"><rect x="10" y="10" width="4" height="100"/><rect x="16" y="10" width="2" height="100"/><rect x="22" y="10" width="2" height="100"/><rect x="32" y="10" width="4" height="100"/><rect x="38" y="10" width="6" height="100"/><rect x="46" y="10" width="2" height="100"/><rect x="54" y="10" width="2" height="100"/><rect x="58" y="10" width="6" height="100"/><rect x="70" y="10" width="4" height="100"/><rect x="76" y="10" width="2" height="100"/><rect x="82" y="10" width="4" height="100"/><rect x="88" y="10" width="6" height="100"/><rect x="98" y="10" width="2" height="100"/><rect x="102" y="10" width="6" height="100"/><rect x="110" y="10" width="8" height="100"/><rect x="120" y="10" width="4" height="100"/><rect x="128" y="10" width="2" height="100"/><rect x="134" y="10" width="6" height="100"/><rect x="142" y="10" width="6" height="100"/><rect x="152" y="10" width="2" height="100"/><rect x="158" y="10" width="4" height="100"/><rect x="164" y="10" width="6" height="100"/><rect x="172" y="10" width="2" height="100"/><rect x="176" y="10" width="8" height="100"/><rect x="186" y="10" width="2" height="100"/><rect x="192" y="10" width="4" height="100"/><rect x="198" y="10" width="6" height="100"/><rect x="208" y="10" width="2" height="100"/><rect x="212" y="10" width="6" height="100"/><rect x="220" y="10" width="8" height="100"/><rect x="230" y="10" width="4" height="100"/><rect x="238" y="10" width="2" height="100"/><rect x="244" y="10" width="2" height="100"/><rect x="252" y="10" width="6" height="100"/><rect x="262" y="10" width="2" height="100"/><rect x="266" y="10" width="4" height="100"/><rect x="274" y="10" width="6" height="100"/><rect x="282" y="10" width="2" height="100"/><rect x="286" y="10" width="8" height="100"/><rect x="296" y="10" width="2" height="100"/><rect x="302" y="10" width="4" height="100"/><rect x="308" y="10" width="6" height="100"/><rect x="318" y="10" width="6" height="100"/><rect x="330" y="10" width="2" height="100"/><rect x="334" y="10" width="4" height="100"/><rect x="340" y="10" width="6" height="100"/><rect x="348" y="10" width="4" height="100"/><rect x="354" y="10" width="2" height="100"/><rect x="362" y="10" width="6" height="100"/><rect x="370" y="10" width="4" height="100"/><rect x="380" y="10" width="2" height="100"/><rect x="384" y="10" width="4" height="100"/><rect x="390" y="10" width="6" height="100"/><rect x="402" y="10" width="2" height="100"/><rect x="406" y="10" width="4" height="100"/><rect x="416" y="10" width="6" height="100"/><rect x="424" y="10" width="2" height="100"/><rect x="428" y="10" width="4" height="100"/></g><text x="221" y="130" font-si
…

This output was produced by actually running the tool, not written by hand.

Use cases

Common situations where Code 128 Barcode Generator helps:

  • Encode full ASCII text, serial numbers and tracking codes in the compact, high-density Code 128 symbology with automatic subset switching.

Parameters

This tool has no options — it works on the input alone.

FAQ

What is Code 128 Barcode Generator?

Code 128 Barcode Generator encode full ASCII text, serial numbers and tracking codes in the compact, high-density Code 128 symbology with automatic subset switching. It runs entirely in your browser, so your data stays private.

Is Code 128 Barcode Generator free to use?

Yes. Code 128 Barcode Generator is free, unlimited and works without registration or installation.

Does my data get uploaded?

No. All processing happens locally in your browser; nothing is sent to any server.

Good to know

  • Everything runs client-side, so extremely large inputs are limited by your browser tab’s memory rather than by a server upload limit.

Related tools

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