Code 128 is a high-density linear barcode symbology defined in ISO/IEC 15417:2007. It's used for alphanumeric or numeric-only barcodes and is widely used in shipping and packaging to encode product and logistic information.

How do I create a Code 128 barcode?

Simply enter the data you wish to encode into the input field on this page. Our tool will instantly generate a scannable Code 128 barcode. The data can include numbers, letters, and symbols.

Is there a limit on the number of characters I can use?

Code 128 is highly flexible and can encode a large number of characters. While our tool has no artificial limits, for best scanning performance, it is recommended to keep the data concise.

Can I use this barcode for retail products?

While Code 128 is not typically used for retail point-of-sale in the same way as EAN-13 or UPC, it is a global standard frequently used for internal tracking, inventory management, and supply chain logistics.

How accurate is the generated barcode?

Our generator produces a standard, high-quality Code 128 representation based on the entered data. The final scannability depends on printing quality and the scanner's capabilities.

Logistics Symbology Generator

Create high-density Code 128 barcodes for logistics and shipping. 100% free online tool with instant SVG/PNG download. No sign-up, no watermarks, industrially verified.

Utilize the global standard for high-density logistics tracking. Master character set shifting and the Modulo-103 checksum for fail-safe data integrity.

What Is Code 128? The Versatile Alphanumeric Standard

The Code 128 barcode is a high-density linear symbology that has become the gold standard for industrial and supply chain applications worldwide. Formalized under ISO/IEC 15417, it is the preferred choice for shipping labels and patient identification.

01. Inject

Enter your alphanumeric data. Code 128 supports all 128 standard ASCII characters via Subset shifting.

02. Shift

Our engine dynamically switches between Subsets A, B, and C to optimize symbol density and footprint.

03. Export

Review and download the high-fidelity SVG or PNG manifest. Verify Modulo-103 checksum integrity before printing.

Code 128 Subsets: A, B, and C Explained

The efficiency of Code 128 lies in its three subsets. Subset A handles control characters, Subset B covers standard alphanumeric text, and Subset C packs numeric pairs into a single symbol for maximum compression.

Industrial Metrology and Print Quality

Professional printing requires strict adherence to ISO standards. This includes 10-module Quiet Zones, precise X-Dimension (narrow bar width) calibration, and minimum bar height truncation limits to ensure 100% scan success.

Logistics Data Security

Shipping manifolds contain high-value operational data. MyUtilityBox enforces Zero-Ingestion Encoding. Your barcode generation occurs exclusively in your browser memory, protecting your supply chain blueprints.

Secure Symbology Isolation

All barcode generation and character shifting calculations occur exclusively in your browser's V8 thread. We never ingest your payload data. Professional logistics tools, powered by total privacy.

Disclaimer: No Warranty

The Code 128 Barcode Symbology Utility generated by this site are provided AS IS without warranty of any kind. You are responsible for verifying accuracy before implementation.

Engineering Manifest Verified

This node has been audited for mathematical precision and memory isolation by the MyUtilityBox engineering team. All logic executes locally in browser V8 to ensure zero data leakage. Last Verified: April 2026.

SECURE NODE 1.0