Codablock-F Generator

What is Codablock-F?

Codablock-F is a stacked linear symbology that arranges two or more rows of Code 128-style barcode data into one rectangular block, letting a label hold far more data than a single-row Code 128 while still being readable by many linear (laser) scanners as well as 2D imagers. Each row is itself a self-contained Code 128 structure with added row-indicator characters, so a scanner (or an operator rastering a laser scanner across the block) can reassemble the rows into the original message in any order they're read.

Codablock-F sits between simple linear barcodes and full 2D symbols like Data Matrix or PDF417: it trades some of the compactness of a true 2D code for broader compatibility with legacy linear scanning equipment already deployed in many labs, warehouses and healthcare facilities.

How it works and how the data is structured

A Codablock-F symbol is built from a defined header, one or more data rows, and row/column indicators:

• Start and stop patterns — each row uses standard Code 128 start/stop characters (from subsets A, B or C) so it decodes as valid Code 128 on its own.
• Row indicator — encoded within each row, this tells the decoder which row it's reading and how many rows the full symbol contains, enabling reassembly when rows are scanned out of sequence.
• Data content — the message is split across rows using the full Code 128 character set (uppercase/lowercase letters, digits, punctuation and control characters), so Codablock-F can encode the same broad character range as Code 128 itself.
• Check characters — each row carries its own Code 128 checksum, and the overall symbol can include an additional check character across the full message for extra integrity.

The number of rows and columns is generally chosen automatically based on the message length and the label width available, balancing a wider, shorter block against a narrower, taller one.

Technical specifications

Codablock-F encodes the full Code 128 character set — ASCII 0–127, covering uppercase and lowercase letters, digits and symbols — across 2 to 44 rows, with each row holding up to 62 data characters, giving a theoretical capacity well beyond what a single-row Code 128 barcode can practically print. There is no single universal error-correction scheme comparable to Reed–Solomon in Data Matrix or PDF417; integrity instead relies on each row's own Code 128 check character plus an optional overall checksum. Codablock-F is not managed by a single global standards body the way GS1 or ISO barcodes are — it originated as a de facto industry format (developed for laboratory and blood-bank labeling) and is documented in symbology reference specifications rather than a single ISO standard, though it is explicitly supported as a HIBC carrier symbology by the Health Industry Business Communications Council.

Where it's used

Codablock-F is most established in:

• Clinical laboratory and blood-bank specimen labeling, one of its earliest and most persistent use cases, often under the ISBT 128 standard for blood products.
• Healthcare product labeling under the HIBC standard (see HIBC LIC Codablock-F and HIBC PAS Codablock-F), where it serves as a linear-scanner-friendly alternative to Data Matrix or PDF417.
• Logistics and warehouse labels needing more data than single-row Code 128 within a fixed label width, particularly in facilities that haven't fully converted to 2D imaging scanners.
• European industrial and pharmaceutical supply chains, where Codablock-F saw earlier adoption than in some other regions.

How to create a Codablock-F barcode in Barcode Mint

To generate a Codablock-F symbol:

• Select Codablock-F from the barcode type list.
• Enter the data you want to encode — letters, digits, and punctuation are all supported, same as Code 128.
• Barcode Mint automatically splits the message across the required number of rows and adds the row indicators and check characters needed for correct reassembly.
• Adjust module width and row height to fit your label dimensions, keeping bars wide enough for your scanning hardware's resolution.
• Export as SVG for label artwork or PNG for quick proofing, and use Bulk CSV → ZIP/PDF to generate a unique Codablock-F symbol per row when labeling a batch of samples or shipments.
• Call the REST API at /barcode?type=codablockf&data=... to generate symbols on demand from a lab information system or warehouse application.

Printing and scanning best practices

Because Codablock-F depends on evenly spaced, correctly aligned rows, print at a resolution high enough to keep bar widths and inter-row gaps consistent — low-quality thermal printing can blur row boundaries and cause misreads or partial decodes. Maintain a clear quiet zone on all four sides of the block, not just left and right as with a single-row barcode, since the top and bottom rows need their own margin too. Confirm your scanning hardware, whether a linear laser scanner in raster mode or a 2D imager, is configured to handle multi-row decoding, and verify symbol quality against your industry's applicable grading standard before a full print run, especially for lab specimen labels where a misread has real consequences.

Codablock-F vs related codes

Compared with a single-row Code 128, Codablock-F holds far more data in the same label width by stacking rows, at the cost of needing a taller label and, ideally, a scanner that handles multi-row decoding. Compared with PDF417, Codablock-F is generally readable by more legacy linear laser scanners, while PDF417 offers stronger built-in Reed–Solomon error correction and is more forgiving of print or surface damage. Compared with Data Matrix, Codablock-F needs a larger physical footprint for equivalent data but doesn't require a 2D imaging scanner, making it a practical bridge format for facilities transitioning their scanning infrastructure gradually rather than all at once.

Common uses

• Clinical laboratory and blood-bank specimen labeling (ISBT 128)
• HIBC healthcare product labeling (see HIBC LIC/PAS Codablock-F)
• Warehouse and logistics labels needing more data than single-row Code 128
• European industrial and pharmaceutical supply chain labeling
• Facilities transitioning from linear scanners to 2D imaging

Frequently asked questions

Related barcode types

Browse all 106 barcode & QR types →