Extended Code 39 (with Checksum) Barcode generator
Generate easy & customizable Extended Code 39 (with Checksum) Barcodes in seconds.
Make sure to test out your configured barcode before using it in production.
Free Extended Code 39 (with Checksum) Barcode Generator – Create Barcodes Online
Generate full-ASCII Extended Code 39 barcodes with a mod-43 check digit in seconds with TryQRCode.
Create a free Extended Code 39 barcode with an embedded mod-43 checksum for full ASCII coverage and verified scanning. Extended Code 39 (with Checksum) pairs two standard Code 39 characters for every encoded character — unlocking the whole 128-character ASCII set — and adds a mandatory mod-43 check digit on top. Customize the colors, width, and height, preview it live, and download it as PNG, SVG, JPG, or WEBP. No login or technical skills required.
Generate Extended Code 39 (with Checksum) BarcodeWhat is an Extended Code 39 (with Checksum) Barcode?
Extended Code 39 (with Checksum) combines two capabilities in one symbol: the full-ASCII coverage of Extended Code 39 and the reliability of a mandatory mod-43 check digit. Each encoded character is represented by a pair of standard Code 39 characters — one shift, one value — so lowercase letters, punctuation, and control characters can all appear in the data. The computed mod-43 check digit is then appended before the stop character, giving the symbol validated scanning at both the character and the checksum level.
In short: Extended Code 39 (with Checksum) is the full-ASCII Extended Code 39 symbology plus a mandatory mod-43 check digit, delivering complete character coverage with verified scanning reliability.
Extended Code 39 (with Checksum) Quick Facts
| Encodes | Full 128-char ASCII set (lowercase, punctuation, control chars) |
|---|---|
| Structure | Two standard Code 39 characters per encoded character |
| Check digit | Mandatory mod-43 check digit |
| Length | Longer than standard Code 39 for the same data |
| Encoding standard | ANSI/AIM BC-1, Code 39 family, mod-43 check |
| Typical use | Full-ASCII data with verified scanning on Code 39 infrastructure |
How to Create Your Extended Code 39 (with Checksum) Barcode
Follow these four steps to generate a professional Extended Code 39 barcode with checksum in under a minute.
1
Enter Your Data
Type or paste any ASCII text — the generator pairs the characters and appends the mod-43 check digit automatically.
2
Customize the Look
Adjust foreground and background colors, width scale, height, and toggle the human-readable text.
3
Generate & Preview
Your barcode renders instantly with a live preview so you can verify it before download.
4
Download & Print
Export as PNG, SVG, JPG, or WEBP and use it on labels, tags, and packaging.
No registration required. Your barcode is generated in seconds and ready for print or digital use.
Benefits of Extended Code 39 (with Checksum) Barcodes
Why teams and businesses choose Extended Code 39 (with Checksum) barcodes for dependable, scannable identification.
Verified Every Read
The mandatory mod-43 check digit validates the data on each scan.
Full ASCII Coverage
Lowercase, punctuation, and control characters all become encodable.
Checksum Computed for You
The generator builds the pair encoding and check digit automatically.
Code 39 Compatible
Decoded by the same readers that handle standard and Extended Code 39.
Proven Family
Stays inside the ANSI/AIM Code 39 family trusted across industry.
Scans Everywhere
Read by virtually all modern laser and camera barcode scanners.
Common Use Cases for Extended Code 39 (with Checksum)
See how Extended Code 39 (with Checksum) barcodes are used across retail, logistics, healthcare, and manufacturing.
Personal ID Data
Mixed-case names and identifiers verified on badges and cards.
Document Labels
Punctuated titles and references with a reliable check.
Healthcare Records
Full-text labels on legacy Code 39 readers, now checked.
Logistics Tags
Mixed-case routing data validated at every scan point.
Product Notes
Full-ASCII descriptions added to standard Code 39 labels.
Asset Tracking
Descriptive asset tags with built-in data validation.
Extended Code 39 (with Checksum) Barcode – Frequently Asked Questions
Quick answers about full-ASCII Extended Code 39 and its mod-43 checksum.
It is the full-ASCII Extended Code 39 symbology plus a mandatory mod-43 check digit, combining complete character coverage with verified scanning reliability.
Yes. Extended Code 39 pairs two standard Code 39 characters per encoded character, which unlocks the full 128-character ASCII set including lowercase and punctuation.
The mandatory mod-43 check digit validates every scan, which matters when full-ASCII data is being read at speed in logistics or healthcare.
Both encode the full ASCII set. The with-checksum version also appends a mandatory mod-43 check digit for stronger error detection.
Yes — every character is encoded as a pair of Code 39 symbols, so symbols are roughly twice as long as standard Code 39 for the same data.
Yes. Any scanner that decodes standard Code 39 also decodes Extended Code 39, with or without the checksum.
Create Your Free Extended Code 39 (with Checksum) Barcode Now
Generate a scannable, print-ready Extended Code 39 barcode with a verified mod-43 check digit in seconds—encode any ASCII text and download it in any format.
Generate Extended Code 39 (with Checksum) Barcode
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