Barcode vs. QR Code

The question "should I use a barcode or a QR code?" comes up in almost every labelling project. The answer depends on three things: how much data you need to encode, what equipment will scan it, and what scanning conditions you expect. This article compares both in terms that matter for practical label design.

Structural Differences

A traditional barcode (1D) encodes data in a pattern of parallel bars and spaces of varying widths. The scanner reads a single horizontal line across the symbol. Height adds scanning headroom but no data. A QR code (2D) encodes data in a grid of black and white square modules — data is distributed across both dimensions. The scanner reads the entire grid at once, which is why QR codes can be read from any rotation angle and can carry far more data in a similar physical area.

Data Capacity

* Code 128 capacity scales with label width — the barcode grows wider as data increases. The practical limit for a readable label is around 48 alphanumeric characters at minimum bar width before the symbol becomes unwieldy.

Error Correction

1D barcodes have no error correction — a single damaged or unreadable bar causes a scan failure. QR codes include Reed-Solomon error correction at four levels: L (7% recovery), M (15%), Q (25%), and H (30%). This means up to 30% of a QR code's surface can be damaged, obstructed, or dirty and it will still scan correctly. This makes QR codes significantly more tolerant of real-world label damage than any 1D symbology.

Scanning Distance and Equipment

Laser barcode scanners project a laser line across the symbol and measure reflected light. They are fast (multiple scans per second), work at distances of 0.1–10 metres depending on the scanner model, and are the industry standard in retail point-of-sale and warehouse environments. They cannot read 2D codes.

Imager scanners (camera-based) capture the entire symbol at once, process it digitally, and read both 1D and 2D codes. Modern imager scanners are as fast as laser scanners and have largely replaced laser-only scanners in new deployments. Smartphone cameras function as imager scanners for QR codes and DataMatrix, no dedicated hardware needed.

When to Use a Barcode

Choose a 1D barcode when the data is short and fixed-format (a SKU, a GTIN, a location code), when you are working with existing laser scanner infrastructure, when scanning distance and speed are critical, or when industry standards mandate a specific 1D symbology (UPC at retail, Code 128 in GS1 logistics). See the Code 128 generator or UPC-A generator.

When to Use a QR Code

Choose a QR code when the data is long (a URL, a contact vCard, WiFi credentials), when users will scan with smartphones without dedicated hardware, when orientation is uncertain, or when label damage tolerance is important. QR codes are also the better choice for asset tracking with phone-accessible asset records. Use the QR code generator.

Frequently Asked Questions