Barcode Generator Generate barcodes in various formats including CODE128, EAN, UPC, and more.

What Is Barcode Generator?

A barcode generator that creates standard barcodes from text or numeric input in multiple formats. Supports CODE128 (general purpose), EAN-13 (retail), UPC-A (US products), Code39 (inventory), ITF-14 (shipping), and more. Built with JsBarcode for standards-compliant output that scans reliably. Customize bar width, height, font, and colors. Download as high-resolution PNG for printing.

Why Use Barcode Generator?

• Multiple formats: CODE128, EAN, UPC, Code39
• Standards-compliant for reliable scanning
• Customizable dimensions, colors, and text
• High-resolution PNG for print quality

Common Use Cases

Retail

Generate EAN-13 and UPC-A barcodes for product packaging.

Inventory

Create Code39 or CODE128 barcodes for asset tracking.

Shipping

Generate ITF-14 barcodes for shipping containers.

Libraries

Create barcodes for book cataloging and library management.

Technical Guide

Barcodes are generated using JsBarcode which renders symbologies onto SVG or Canvas. Each format has specific encoding rules: CODE128 uses variable-width bars, EAN-13 uses fixed-width with check digits, UPC-A uses 12-digit encoding. The library calculates check digits automatically and validates input. Output is rendered to Canvas and exported as PNG.

Tips & Best Practices

• 1
  Use CODE128 for general-purpose alphanumeric barcodes
• 2
  EAN-13 requires exactly 12 digits (check digit auto-calculated)
• 3
  Print at 300 DPI minimum for reliable scanning
• 4
  Test printed barcodes with a scanner before mass production

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Frequently Asked Questions

Q Which barcode format should I use?

CODE128 for general use, EAN-13 for retail, UPC-A for US products, Code39 for inventory.

Q Are check digits calculated automatically?

Yes — check digits are calculated automatically for formats that require them.

Q Can I customize barcode appearance?

Yes — adjust bar width, height, font size, and foreground/background colors.

Q What resolution for printing barcodes?

Generate at largest size practical and print at 300+ DPI.

Q Why does my barcode input fail validation?

Each format has specific requirements — e.g., EAN-13 needs 12 digits, UPC-A needs 11.

About This Tool

Barcode Generator is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.