Free Code 39 Barcode Generator

Create USD-3 and LOGMARS compliant Code 39 barcodes for automotive, defense, and healthcare applications.

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Code 39 Symbology Specifications & Quiet Zones

Code 39 (also known as Alpha39, Code 3 of 9, or USD-3) is a discrete, variable-length barcode symbology. The Code 39 specification defines 43 characters, consisting of uppercase letters (A through Z), numeric digits (0 through 9), and seven special characters (- . $ / + % [space]).

An asterisk (*) is reserved as a start and stop character. LabelQueue automatically embeds start/stop asterisks and validates Quiet Zone margins (10X module width) in generated vector PDFs.