Free Extended Code 39 barcode generator
Create a scannable Extended Code 39 symbol right here in your browser. Legacy systems that need the full ASCII range but must stay readable by Code 39 scanners. Download it as PNG, SVG or PDF — no signup, no watermark, and nothing you type leaves your computer.
Extended Code 39 settings
#000000#FFFFFFPreview
Extended Code 39 specification
| Type | 1D linear barcode |
|---|---|
| Character set | full 128-character ASCII, encoded as Code 39 pairs |
| Length | variable |
| Check digit | optional modulo-43 |
| Standard | ISO/IEC 16388 |
| GS1 symbology | No |
Where Extended Code 39 is used
Legacy systems that need the full ASCII range but must stay readable by Code 39 scanners.
Printing Extended Code 39 on a thermal printer
A generated image is fine for a one-off. For a production run you want the barcode rendered by the printer at its own resolution, sized in whole dots so the narrow bar lands on an exact dot boundary. LabelInn does that on Zebra, TSC, Toshiba and Epson hardware, and it can drive one label per row straight from your data.
Frequently asked questions
Is this Extended Code 39 generator really free?
Yes. The generator runs entirely in your browser, there is no signup, and the downloads carry no watermark.
Does my data get uploaded anywhere?
No. The symbol is encoded locally in your browser. Nothing you type is sent to a server.
What can Extended Code 39 encode?
full 128-character ASCII, encoded as Code 39 pairs. Length: variable. Check digit: optional modulo-43.
Can I print Extended Code 39 labels in bulk from a spreadsheet?
Not from this page — this tool makes one symbol at a time. LabelInn binds a spreadsheet column to the barcode field and prints one label per row on a thermal printer.
Printing Extended Code 39 labels in production?
This generator makes one symbol. When you need a batch — one label per row from a spreadsheet, a database or your API — LabelInn renders Extended Code 39 natively on the printer at its own resolution.
Download free Print labels from an Excel file