Code 39 Breakdown Visualizer
Visualize Code 39 encoding character-by-character. Enter any text to see how it's encoded, including start/stop asterisks, data characters, optional Mod 43 checksum, and their individual bar patterns.
Enter Text to Encode
Examples:
Code 39 Encoding Breakdown
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symbols |
Legend:
Start (*)
Data Character
Checksum (Mod 43)
Stop (*)
Code 39 Pattern Structure
Each Code 39 character consists of 9 elements: 5 bars and 4 spaces. Exactly 3 elements are wide (w) and 6 are narrow (n).
The pattern notation shows alternating bars and spaces starting with a bar. For example, nwnnwnwnn means:
narrow bar, wide space, narrow bar, narrow space, wide bar, narrow space, wide bar, narrow space, narrow bar.