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Free Code 39 Barcode Generator

Classic alphanumeric barcode symbology widely used in US Department of Defense (LOGMARS) and automotive manufacturing.

11. Selected SymbologyISO/IEC 16388

Code 39

Code 39 — Alphanumeric barcode widely used in automotive, government, and industrial systems.

22. Enter Barcode ValueVALID ✅

ℹ️ 43 characters: 0-9, A-Z (uppercase only), and symbols (-, ., $, /, +, %, space)

⚙️ Barcode Sizing & Visual Style▼

Bar Width (2x)

Bar Height (px)

Quiet Zone Margin

Text Font Size

Bar Color

Background Color

Display Human-Readable Text

Text Position

Instant Barcode Preview

Vector Live Preview

Download Format:

TECHNICAL SPECCHECKSUM PASS

TYPE: Code 39

LENGTH: 10

DATA: CODE39TEST

What is Code 39 Barcode?

Classic alphanumeric barcode symbology widely used in US Department of Defense (LOGMARS) and automotive manufacturing. Defined under standard ISO/IEC 16388, Code 39 is engineered for fast, reliable optical scanning across industrial and commercial environments.

Specification	Details
Standard Symbology	Code 39 (ISO/IEC 16388)
Character Set	43 characters: 0-9, A-Z (uppercase only), and symbols (-, ., $, /, +, %, space)
Checksum Algorithm	Optional Modulo 43 check character
Quiet Zone Margin	Minimum 10 times the narrow bar width or 0.25 inches (6.35 mm)
Processing Mode	100% Client-Side In-Browser (Zero Server Logs)

✅ Key Advantages

•Self-checking symbology with high fault tolerance
•Simple encoding structure supported by virtually every legacy barcode reader
•Can be printed with special barcode fonts without algorithmic conversion

📦 Common Use Cases

•US Department of Defense military supply chain (MIL-STD-129 / LOGMARS)
•Automotive Industry Action Group (AIAG) parts labeling
•Hospital ID badges and specimen tubes
•Industrial inventory bins and machinery parts

Frequently Asked Questions

What is Code 39?

Code 39 (also called Code 3 of 9) is a discrete, self-checking linear barcode symbology capable of encoding 43 alphanumeric characters. Each character is represented by 9 elements (5 bars and 4 spaces), 3 of which are wide.