바코드 생성기

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QR Code Generator

Create QR codes for URLs, WiFi, vCards, and more.

How to Use

  1. 1
    Enter your data

    Type or paste the value you want to encode. The format determines valid characters — EAN-13 requires exactly 13 digits, UPC-A requires 12 digits.

  2. 2
    Choose barcode format

    Select from CODE128 (universal), EAN-13 (retail products), UPC-A (North American retail), Code39 (industrial), ITF-14 (shipping), or ISBN.

  3. 3
    Download your barcode

    Click Generate to render the barcode. Download as SVG for print use or PNG for web. Toggle the value display below the barcode.

About

Barcodes are machine-readable representations of data using patterns of parallel lines (1D barcodes) or geometric shapes (2D codes). First patented in 1952 by Norman Woodland and Bernard Silver, barcodes became commercially viable in 1974 when a pack of Wrigley's chewing gum was scanned at a Marsh supermarket in Ohio — the first retail barcode transaction.

The most common barcode formats serve different industries. EAN-13 (European Article Number) is the global standard for retail products, used by over 100 countries. UPC-A dominates North American retail. CODE128 is the most versatile linear barcode, encoding all 128 ASCII characters in a compact format — it's widely used in shipping labels, inventory tracking, and healthcare.

Code39 (also called Code 3 of 9) was one of the first alphanumeric barcodes and remains popular in automotive, defense (MIL-STD-1189), and government applications. ITF-14 is specifically designed for shipping containers, with bearer bars that prevent misreads on rough surfaces.

Barcode scanning works by measuring the reflectance of light off the bars and spaces. The width ratios encode binary data that maps to characters. Modern barcode scanners can read codes from screens, at angles, and even when partially damaged — though keeping barcodes clean and undistorted ensures the highest scan success rate.

FAQ

What is the difference between CODE128 and Code39?
CODE128 is a high-density format that encodes all 128 ASCII characters, making it compact and versatile. Code39 only supports uppercase letters, digits, and a few symbols, producing wider barcodes. CODE128 is preferred for most modern applications due to its smaller size and broader character support.
How many digits does an EAN-13 barcode need?
EAN-13 requires exactly 13 digits: a 2-3 digit country code, a manufacturer code, a product code, and a check digit. The check digit is calculated automatically. If you enter 12 digits, the generator calculates the 13th digit for you.
What is UPC-A used for?
UPC-A (Universal Product Code) is the standard barcode format for retail products in North America. It encodes 12 numeric digits — a number system digit, a 5-digit manufacturer code, a 5-digit product code, and a check digit. Nearly every item sold in US and Canadian stores uses UPC-A.
Can I use barcodes for inventory management?
Yes. CODE128 and Code39 are widely used in inventory and warehouse management. CODE128 is compact and supports all ASCII characters, making it ideal for serial numbers and tracking codes. Code39 is common in government and military logistics (LOGMARS standard).
What is ITF-14 and when should I use it?
ITF-14 (Interleaved 2 of 5) is designed for outer shipping containers and cartons. It encodes 14 digits and includes a thick border (bearer bar) for reliable scanning on corrugated surfaces. Use ITF-14 when you need to label shipping boxes, pallets, or outer packaging.