Barcodes and QR codes are both machine-readable patterns that encode data visually. They are used everywhere from supermarket checkouts to airline boarding passes. But they work differently and are suited to different tasks.
A traditional barcode — technically called a 1D or linear barcode — encodes data in a series of vertical lines of varying widths. A laser or camera scanner reads the pattern by measuring the widths of the lines and gaps from left to right. Because data is encoded in only one dimension, capacity is limited: a standard EAN-13 barcode (the kind on supermarket products) holds exactly 13 digits.
Barcodes must be scanned from a specific direction — horizontally across the lines. They cannot be read upside down or at an angle without a specialised scanner.
A QR code encodes data in two dimensions — both horizontally and vertically across a grid of modules. This allows far greater data density. A QR code can store up to 7,089 numeric characters, compared to around 20 for a typical barcode.
Because of the three finder patterns in the corners, QR codes can be read from any angle with any standard camera. Error correction means a QR code can still be scanned even if up to 30% of it is damaged or obscured.
Data capacity: Barcodes hold 10–20 characters. QR codes hold up to 7,089 characters.
Dimensions: Barcodes are 1D (horizontal only). QR codes are 2D (horizontal and vertical).
Scan direction: Barcodes require horizontal alignment. QR codes scan from any angle.
Error tolerance: Barcodes have no error correction. QR codes can recover from up to 30% damage.
Scanner required: Barcodes need a laser or camera scanner. QR codes work with any smartphone camera.
Content type: Barcodes store numbers. QR codes store URLs, text, contact data, WiFi credentials and more.
Barcodes remain the standard for retail product identification (EAN, UPC), library systems and logistics tracking where scanners are fixed and items move past them on a conveyor. The ecosystem of scanners, databases and software around 1D barcodes is deeply established and efficient for high-volume, low-data applications.
QR codes are the right choice when you need to encode more than a product number — a URL, contact details, WiFi credentials, a payment reference or location coordinates. They are also the better choice when the scanner is a consumer smartphone rather than a dedicated device.