Code 128 Barcode Generator
Generate Code 128 barcodes online for free. High-density alphanumeric barcode standard for Amazon FBA FNSKU labels, warehouse inventory SKUs, serial numbers, and shipping packages. Instant 300 DPI PNG & SVG download.
1. Barcode Value & Symbology
2. Dimensions & Colors
How to Use Code 128 Barcode Generator
3 Easy Steps- Enter Alphanumeric SKU / ValueType your product SKU, serial number, or Amazon FNSKU identifier (e.g. SKU-982410-AB).
- Adjust Bar Height & FontConfigure bar width, height, human-readable text position (top/bottom), and font size.
- Download Vector SVG or PNGClick "Download High-Res PNG" or "Download SVG" and print your compliant barcode labels.
Code 128** is the global benchmark for high-density linear 1D barcodes used across modern supply chains, logistics fulfillment, warehouse management systems (WMS), and e-commerce platforms. Defined by ISO/IEC 15417, Code 128 is prized for its high data density, compactness, and ability to encode the complete 128 ASCII character set—including numeric sequences, alphanumeric strings, punctuation, and control characters.
**Amazon FBA FNSKU Labels**: Amazon strictly mandates Code 128 (specifically Code 128A, 128B, or 128C) for all Fulfillment by Amazon (FBA) item-level FNSKU labels (starting with `X00...` or `B00...`). **Alphanumeric Warehouse SKUs**: Unlike pure numeric barcodes like EAN or UPC, Code 128 easily encodes complex internal inventory codes combining letters, dashes, and numbers (e.g., `WH-BIN-42A-09`). **Automated Modulo-103 Checksum**: Every Code 128 symbol includes a mathematically calculated check digit before the stop pattern, guaranteeing near-zero substitution error rates during automated conveyor laser scanning. **Code 128A**: Uppercase characters, punctuation, numbers, and standard ASCII control characters. **Code 128B**: Standard alphanumeric (uppercase and lowercase letters), punctuation, and numbers. (Most widely used for retail SKUs). **Code 128C**: Double-density numeric encoding that pairs digits into 2-digit numeric bytes, producing half-width barcodes for long serial numbers.
EtoolMitra executes all barcode math and SVG vector rendering locally in your device's web browser using JavaScript. Generate unlimited Code 128 barcodes for commercial packaging and inventory labels completely free.
Why Code 128 Barcode Generator Online - Free Alphanumeric Barcode Maker (Auto/A/B/C) Is Essential for Your Workflow
Code 128 Barcode Generator Online - Free Alphanumeric Barcode Maker (Auto/A/B/C) simplifies complex processing tasks directly in your web browser without requiring desktop software, third-party plugins, or account registration.
Whether you are preparing digital submissions, optimizing customer-facing assets, or automating routine calculations, this browser-based utility delivers fast, predictable, and compliant outputs with 100% privacy.
Standard Specifications and Processing Architecture
All calculations, document manipulations, and visual formatting algorithms execute entirely on the client side using modern web assembly and HTML5 canvas APIs.
This ensures that files maintain full vector clarity, precise pixel fidelity, and exact compliance with official platform standards and organizational guidelines.
Frequently Asked Questions
Quick answers about Code 128 Barcode Generator, formats, and specifications.
What is a Code 128 barcode used for?
Code 128 is used globally for inventory management, shipping labels, serial numbers, asset tracking, and Amazon FBA FNSKU product barcodes due to its ability to encode both letters and numbers in a compact width.
Can I use this Code 128 generator for Amazon FBA labels?
Yes! Enter your Amazon FNSKU string (e.g. X003AB99ZY) and download the 300 DPI PNG or SVG. It complies with all Amazon FBA optical scanning and print resolution standards.
What is the difference between Code 128 and Code 39?
Code 128 has a significantly higher data density than Code 39 (taking up roughly 30% less physical label width for the same text) and supports the full 128 ASCII character set including lowercase letters.
Can I print these barcodes on 4x6 inch thermal sticker printers?
Yes! The exported 300 DPI PNG and vector SVG files maintain razor-sharp optical contrast designed specifically for direct thermal and thermal transfer printers like Zebra, Rollo, and Xprinter.
Is Code 128 Barcode Generator Online - Free Alphanumeric Barcode Maker (Auto/A/B/C) completely free to use?
Yes, this tool is 100% free with no registration, no hidden subscriptions, and no usage limitations.