Data Matrix, PDF417 and Aztec: The Other 2D Codes

QR codes are not the only two-dimensional codes. Several others are in daily use.

Data Matrix

Data Matrix is a square code made of small modules, with a solid "L" shape along two edges and alternating dots on the other two. It can be printed very small, which makes it useful for:

• marking small electronic parts
• medicine packaging in some markets
• labelling tools and components

PDF417

PDF417 is a stacked code: it looks like a stack of tall barcode rows. It holds a good amount of data, and is often used on:

• some boarding passes
• driving licences in some countries
• ID cards and shipping documents

Aztec

Aztec codes have a square bullseye in the centre, not corner squares. They do not need a quiet zone as wide as QR codes need. They are often used on:

• train and event tickets
• some boarding passes

How they differ from QR

Code	Recognisable by
QR	three corner squares
Data Matrix	solid L-shaped border
PDF417	stacked barcode rows
Aztec	central bullseye

Which do you meet?

You probably scan QR codes most, but tickets, licences and product parts may carry one of the others. The choice depends on space, data size and what is standard in the industry.

Tips

1. Look at the pattern to identify the code.
2. Hold the phone steady, especially for wide PDF417 codes.
3. Follow the ticket's rules about brightness and screen cleanliness.

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