bulkqr.codes

Code 39 barcode generator

The long-lived "3 of 9" barcode still required by many asset-tracking, library and government systems. Upper-case letters, digits and a few symbols.

1 Your data

One code per line, or paste rows straight from a spreadsheet

First row is a header

Encode

File names from

File name prefix

0 rows · 0 ready

2 Code type & look

Symbology

Code colour

Background

Transparent background

PNG width ≈ 600 px

Quiet zone: 10 modules (spec minimum 10)

Bar height: 15

Print digits under the bars

Caption under each code

3 Preview & export

First 0 of 0. Everything is generated in your browser.

Add some rows in step 1 and your labels appear here.

Download as

Remember my settings on this device ·

About Code 39

Code 39 is self-checking: each character is nine elements, three of them wide, so a single misread element cannot turn into another valid character. That is why it survived decades without a mandatory check digit.

The trade-off is size: Code 39 is roughly 30–50% wider than Code 128 for the same data. Lower-case letters are converted to upper case here, because standard Code 39 has no lower case.

Code 39 specification
Characters	A–Z, 0–9, space, - . $ / + %
Length	Variable (up to 43 here)
Used for	Asset tags, ID badges, US DoD, automotive (AIAG)
Quiet zone	10 modules each side
Check	Optional mod-43, usually not used
Start/stop	* character added automatically

Code 39 questions

Why did my lower-case text become capitals?

Standard Code 39 only has upper-case letters. We convert automatically so the scan returns the same letters. Use Code 128 if case matters.

Do I type the * start and stop characters?

No. They are added for you. The human-readable line shows the data only.