What Is a Data Matrix Barcode?

Data Matrix is a two-dimensional barcode that packs a large amount of data into a very small area. Thanks to strong error correction it stays readable even when partly damaged; it is common in industrial part marking and pharmaceuticals.

Sample data: DM-TR-4821

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Key facts

Where is it used?

• Pharmaceutical traceability (data-matrix on medicine boxes)
• Electronics and automotive part marking
• Serial numbers on small products
• Document and form tracking

Data Matrix vs QR code: which one for your label?

Both are two-dimensional codes, but they solve different problems. A Data Matrix symbol stays readable at much smaller sizes — a 10×10 mm mark on a circuit board or a medicine box is routine — and its ECC 200 error correction recovers the content even when up to ~30% of the symbol is damaged. A QR code needs more space for the same data but any smartphone camera reads it. Rule of thumb: pick Data Matrix for industrial part marking and regulated packaging, pick QR when consumers will scan the code with a phone.

On a printed label, size the symbol by module, not millimetres: each module (one black square) should be at least 3–4 printer dots. At 8 dpmm (203 dpi) a module height of 4–6 gives a symbol that scans reliably; going smaller saves space but fails on worn or curved surfaces. In ZPL the ^BX command draws the symbol:

^XA
^FO60,60^BXN,6,200
^FDLOT42.SN123456^FS
^XZ

GS1 Data Matrix is the same symbol carrying GS1 field data (Application Identifiers), the format used for pharmaceutical serialisation: one small square carries the GTIN (01), expiry (17), batch (10) and serial number (21) at once. That is why the tiny square on a medicine box is a Data Matrix, not a QR code.

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