Code 128 Barcode Generator
High-density alphanumeric barcode for logistics, shipping, and inventory.
Create Your Code 128 Barcode
Create Barcodes for Any Symbology
Compare Code 128 with Code 39 or ITF-14 when specs call for a different symbology.
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- Data Matrix Barcode Generator
- PDF417 Barcode Generator
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- Barcode Scan
How to use the Code 128 Barcode Generator
Create a scannable Code 128 Barcode in three steps.
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1
Enter alphanumeric logistics data
Type SKUs, cartons IDs, or ASN strings. Code 128 encodes the full ASCII set efficiently for warehouse labels.
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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 128 Barcode
Optimize Code 128 height and quiet zones for corrugated and thermal ribbon stock.
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.
- Shorter SKUs keep symbols narrower for pick-face labels.
- GS1-128 needs Application Identifiers — plain Code 128 is fine for internal strings.
- Test scanners after changing X-dimension.
Download Code 128 Barcode Formats
SVG for carton printers; PNG for WMS soft proofs.
| 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 128 Barcode Use Cases
Where logistics teams deploy Code 128 most often.
How Code 128 Barcodes work
From typed SKU to scanned warehouse action.
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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
WMS looks up the string
Code 128 payloads map to carton, bin, or job records inside your warehouse system.
Privacy / Security
Code 128 payloads are encoded in-browser and not stored on our servers.
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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 128 Barcodes?
Why Code 128 remains the logistics workhorse.
High data density
Encode more characters per inch than Code 39 on the same label width.
WMS default
Most modern warehouse systems standardize on Code 128 for internal IDs.
Full ASCII support
Carry mixed letters, digits, and symbols without inventing a retail GTIN.
GS1-128 ready
Extend to Application Identifiers when trading partners require GS1 structure.
Thermal friendly
Print crisp bars on common 203/300 dpi label printers.
Gun and camera readable
Handheld lasers and phone imagers both decode clean Code 128 samples.