Code 128 Generator
Create high-density alphanumeric Code 128 linear barcodes with custom text labels.
TL;DR: Code 128 Generator creates high-density linear barcodes encoding full ASCII alphanumeric characters for shipping and logistics.
Code 128 Alphanumeric Barcode Creator
Enter alphanumeric characters, SKU codes, serial numbers, or shipping identifiers.
What Is a Code 128 Barcode?
Code 128 is a high-density, variable-length alphanumeric linear barcode symbology capable of encoding all 128 ASCII characters (numbers, uppercase and lowercase letters, and punctuation). It is the global standard for shipping labels, logistics tracking (GS1-128), and warehouse inventory systems.
How to Use the Code 128 Generator
Our Code 128 Generator is engineered to run 100% locally in your web browser with zero external API latency and complete client-side security.
- Enter any alphanumeric text, SKU number, or tracking code.
- Adjust the bar width, height, and display options.
- Preview the generated Code 128 barcode pattern.
- Download in PNG or scalable vector SVG format.
Key Capabilities & Best Practices
- Instant In-Browser Execution: Zero network round-trips or server latency; calculations and processing update in real time.
- Fully Responsive & Mobile Optimized: Designed with accessible touch controls and fluid typography across desktop, tablet, and mobile screens.
- Standardized Formats: Generates standards-compliant outputs ready for professional commercial, retail, development, or personal workflows.
100% Client-Side Privacy Guarantee
All calculations, cryptographic operations, file sanitizations, and document renderings occur 100% locally on your device. Your passwords, invoices, camera feeds, and files are never transmitted to remote servers.
Frequently Asked Questions
- Code 128 is an alphanumeric barcode symbology capable of encoding all 128 ASCII characters with high data density.
- Code 128 supports numbers (0–9), uppercase letters (A–Z), lowercase letters (a–z), and all standard ASCII punctuation and control characters.
- Subset A encodes uppercase letters and control characters; Subset B encodes uppercase and lowercase letters; Subset C encodes double-density numeric pairs (00-99).
- It provides compact bar width, supports alphanumeric serial numbers, and includes built-in checksum verification for error-free scanning.
- By using three distinct character subsets and encoding numeric pairs as single characters in Subset C, it keeps label widths compact.
- Yes. Code 128 fully supports spaces, hyphens, slashes, periods, and special punctuation symbols.
- Code 128 is much more compact, supports lowercase letters, and includes a mandatory check digit; Code 39 is wider and older.
- Yes. It is 100% free with no limits, subscriptions, or watermarks.
Embed This Tool
Add the live Code 128 Generator to your own website with this lightweight responsive iframe:
<iframe src="https://nexlove.org/embed/code-128-generator.html" width="100%" height="650" style="border:1px solid #e2e8f0;border-radius:12px" title="Code 128 Generator — NexLove.org" loading="lazy"></iframe>