Barcode Scanner Types Explained: Laser, Linear Imager, 2D Imager

Not all barcode scanners read the same codes the same way, and picking the wrong technology means either slow scanning, frequent misreads, or an inability to read the codes you actually need. The three main types found in day-to-day use are laser scanners, linear (1D) imagers, and 2D imagers.

Laser scanners use a moving laser beam to sweep across a barcode and measure the reflected light, decoding standard 1D (linear) barcodes like UPC and Code 128. They're fast, reliable at a range of distances, and inexpensive, but they can only read 1D barcodes — they cannot read 2D codes like QR codes or DataMatrix, and they generally can't read a barcode directly off a phone screen.

Linear (1D) imagers use a small camera sensor instead of a laser to capture an image of the barcode and decode it digitally. They read the same 1D barcode types as laser scanners, often more tolerantly (less precise aiming needed), and since there's no moving laser mechanism, they tend to be more durable in drop-heavy environments. Like laser scanners, though, they're still limited to 1D codes.

2D imagers capture a full image and can decode both 1D barcodes and 2D codes — QR codes, DataMatrix, PDF417 — as well as barcodes displayed on a screen, damaged or poorly printed codes that a laser might reject, and in many cases barcodes at odd angles that a linear scanner would need re-aimed for. This flexibility comes at a somewhat higher price than 1D-only scanners.

For a general retail counter or warehouse handling only standard product barcodes, a 1D laser or linear imager is often enough and costs less. Any environment that needs to scan QR codes, mobile boarding passes or tickets, ID documents, or damaged/dirty labels needs a 2D imager — increasingly the default choice as 2D codes become more common across industries.