Code 39 Barcode Generator
Classic alphanumeric barcode still common in industrial and military labeling.
Create Your Code 39 Barcode
Create Barcodes for Any Symbology
Prefer Code 128 for new projects unless legacy scanners require Code 39.
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- Barcode Scan
How to use the Code 39 Barcode Generator
Create a scannable Code 39 Barcode in three steps.
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1
Enter uppercase alphanumeric data
Code 39 supports digits, uppercase letters, and a small symbol set. Ideal when a customer spec still mandates it.
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2
Adjust size and text
Set bar height, colors, quiet zones, and human-readable digits so the label matches your stock and scanners.
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3
Download your barcode
Export PNG for proofs or SVG for print vendors. Verify with a handheld gun or our online scanner before mass printing.
Customize Your Code 39 Barcode
Keep Code 39 wide enough — it is less dense than Code 128 for the same string.
Set bar height
Match the vertical size to your label stock and scanner gun.
Taller bars help handheld scanners at awkward angles. Shorter bars fit compact shelf talkers when width already meets the X-dimension.
- Follow retailer or GS1 magnification tables when printing for POS.
- Do not shrink below the minimum bar height your gun vendor specifies.
- Keep consistent height across a SKU family so pickers scan reliably.
Choose bar and background colors
Keep strong contrast so laser and camera scanners decode cleanly.
Dark bars on a light background remain the safest combination. Preview contrast before you approve packaging ink.
- Avoid red bars under red POS lasers.
- Matte substrates scan better than gloss glare.
- Never place text through the bar pattern.
Show human-readable text
Print digits under the symbol for manual entry when a scan fails.
Toggle human-readable interpretation so operators can type the GTIN or Code 128 string if the gun cannot read a damaged label.
- Use a clear sans-serif font sized for arm’s-length reading.
- Keep HRI outside quiet zones.
- Match the printed digits to the encoded payload exactly.
Protect quiet zones
Leave clear margins so scanners find the start and stop of the symbol.
Quiet zones on both sides (or around 2D codes) are required by most symbology specs. Crowding artwork into the margin causes no-reads.
- Never crop SVG exports into the quiet zone.
- Watch shrink wrap and box seams that push into margins.
- Verify with a physical sample on the target substrate.
Respect check digits
Retail and some logistics codes reject wrong check digits at scan time.
Where the symbology requires a check digit, the generator follows the standard algorithm so POS and WMS systems accept the label.
- Do not invent retail GTINs — obtain prefixes from GS1 when selling through stores.
- Confirm MSI check-digit variants with your retailer firmware.
- Re-scan after any manual digit edits.
Balance density and print size
Longer payloads need wider symbols or taller 2D matrices.
Alphanumeric logistics strings and large PDF417 payloads increase symbol width. Shorten data or enlarge print size when scanners struggle.
- Expect wider labels than Code 128 for long strings.
- Uppercase only — lowercase is not standard Code 39.
- Confirm start/stop asterisks are handled by your printer driver.
Download Code 39 Barcode Formats
PNG for shop-floor proofs; SVG for engraved plates and durable labels.
| Format | Best use for |
|---|---|
| PNG | Quick proofs, packing lists, and digital label drafts at the size you set. |
| SVG | Thermal printers, flexo vendors, and packaging artwork that need sharp bar edges. |
| JPG | Email attachments and documents where a smaller raster file is enough. |
| Print-ready one-page proofs for procurement, QA, or warehouse sign-off. |
Code 39 Barcode Use Cases
Where Code 39 still appears in the field.
How Code 39 Barcodes work
How a Code 39 string becomes a scannable industrial ID.
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1
Data becomes a pattern
Your digits or string are encoded into bar widths or a 2D matrix according to the symbology rules.
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2
Scanners find quiet zones
Clear margins help lasers and cameras locate the start of the symbol and lock onto the pattern.
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3
Check digits validate integrity
Where required, a calculated check digit rejects mistyped or damaged codes before they enter inventory.
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4
Systems act on the payload
POS, WMS, or healthcare systems look up the GTIN, SKU, or serial and continue the workflow.
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5
Legacy system accepts the ID
Code 39 payloads feed older MES or asset databases that never adopted Code 128.
Privacy / Security
Code 39 strings are processed locally and not retained after download.
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No signup
Open the generator and create barcodes without creating an account.
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Free
Core barcode tools run in the browser at no charge for standard downloads.
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No watermark
Exported PNG, SVG, JPG, and PDF files do not carry a platform watermark.
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Browser-based
Generation happens locally in your session — payloads are not rendered on our servers.
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No data stored
We do not save the digits or strings you enter into the generator for later retrieval.
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HTTPS secure
The site is served over HTTPS so your browsing session and downloads are encrypted in transit.
Why use Code 39 Barcodes?
Why teams keep Code 39 for legacy environments.
Spec compliance
Ship labels that match contracts naming Code 39 explicitly.
Legacy gun support
Older industrial scanners often decode Code 39 out of the box.
Simple character set
Limited alphabet reduces encoding surprises for operators.
Easy visual checks
Wide bars make damaged labels easier to spot before scanning.
Engraving friendly
Works on metal and plastic plates when density is not critical.
Manual fallback
Human-readable uppercase text matches the encoded set one-to-one.