Code 128

CODE128

High-density linear barcode symbology

Allowed characters: ASCII 0-127

Live Preview

Your barcode updates automatically as you customize settings

Barcode Content

Text to encode

Display Options

Show text below barcode

Text alignment

Text position

Font size

Text margin

Dimensions

Bar width

Bar height

Colors

Background color

Bar color

Margins

Top margin

Bottom margin

Left margin

Right margin

About Code 128

Example: 123456789012

Character Set: ASCII 0-127

Code 128 is a high-density, variable-length linear barcode symbology defined by ISO/IEC 15417:2007. It can encode all 128 ASCII characters (0-127) including letters, numbers, symbols, and control characters. The symbology uses three code sets (A, B, C) to optimize data density and includes a mandatory check digit for error detection.

Code Sets:

Code Set A: Standard ASCII, control characters
Code Set B: Standard ASCII, lowercase letters
Code Set C: Numeric pairs (00-99) for density
Automatic switching between sets for optimization

Key Applications:

Shipping labels and logistics (UCC/EAN-128)
Product packaging and identification
Supply chain and inventory management
Healthcare specimen tracking (ISBT 128)

Technical Advantages: Code 128 offers the highest data density among linear barcodes while maintaining excellent print tolerance. The built-in check digit and sophisticated encoding algorithm provide superior data integrity. Support for function codes (FNC1-4) enables specialized applications like GS1-128 for supply chain management.

Industry Standards: Widely adopted in GS1-128 (formerly UCC/EAN-128) for global supply chain identification, ISBT 128 for blood banking, and HIBC 128 for healthcare. The format's versatility and reliability make it the preferred choice for mission-critical applications requiring high data capacity and accuracy.