Which barcode symbology should I choose?

Use **Code 128** for internal warehouse inventory, asset tags, and shipping labels because it encodes any ASCII alphanumeric text compactly. Use **EAN-13** or **UPC-A** for retail products scanned at supermarket checkouts. Use **Code 39** for legacy industrial and government supply chain tracking.

Do I need to calculate the 13th check digit for EAN-13 barcodes?

No. If you enter 12 digits, our tool automatically computes the official Modulo-10 check digit according to GS1 international standards.

Is my barcode data sent to any remote server?

No. All barcode calculations, SVG vectors, and PNG renderings are executed 100% client-side inside your browser for complete privacy.

Generators

Barcode Generator

Create standard Code 128, EAN-13, UPC-A, and Code 39 barcodes for products, inventory, and retail labels. 100% free and private.

Quick Answer & Summary

A Barcode Generator creates 1D linear barcodes (Code 128, EAN-13, UPC-A, Code 39) with automated checksum calculations, rendering scalable vector SVG and PNG formats for retail and inventory.

Barcode Symbology100% Client-Side

Barcode Content / Value

Supports all ASCII 32-126 alphanumeric characters and symbols.

Label & Dimensions

Product Label (Optional)

Price Tag (Optional)

Bar Height80px

Bar Scale2x

Show human-readable text digits below barcode

Format: CODE128•366 × 134 px

Share This Tool

Help your team and fellow developers save time with free, private client-side utilities.

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Toolbox Editorial TeamVerified Authors

Systems & Security Engineers • Applied Cryptography & High-Performance Web Tools

Updated: August 2026

100% In-BrowserZero server storage

Standards AuditedRFC & ISO compliant

Peer ReviewedEditorial Policy

Documentation & Guide

How to Use Barcode Generator

Select Barcode Format

Choose Code 128 (general alphanumeric), EAN-13 (global retail), UPC-A (US/Canada retail), or Code 39 (industrial).

Enter Data / SKU

Type your product number, SKU, or alphanumeric code. Check digits are automatically computed for EAN-13 and UPC-A.

Customize & Export

Add a custom product label or price tag, adjust dimensions, and download as vector SVG, high-res PNG, or print label sheets.

Pro Tips

Enter 12 digits for EAN-13; the 13th check digit will be calculated automatically.

Use the 'Print Labels' button to print a sheet of 9 identical stickers on standard sticker paper.

Vector SVG export ensures infinite sharpness when printed at any scale.

Practical Examples & Conversions

Input

Format: EAN-13 | Code: 400638133393

Output

Valid EAN-13: 4006381333931 (Auto-calculated check digit: 1)

Frequently Asked Questions (PAA)

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Authoritative Standards & Citations

Calculations and algorithms on this page are implemented and verified in strict accordance with the following official technical specifications:

IETF (Internet Engineering Task Force)

RFC 7519: JSON Web Token (JWT)

Standardized compact, URL-safe means of representing claims to be transferred between two parties.

W3C Recommendation

Web Cryptography API Specification

Standard JavaScript API for performing basic cryptographic operations in web applications.

IETF Standards Track

RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace

Definition of uniform format and generation algorithms for UUIDs.