The History of the QR Code: From Toyota Parts Tracking to Global Standard

1. The Problem in 1994

Denso Wave, a Toyota group company, needed to track automotive parts through production. Standard 1D barcodes held too little data, so workers had to scan several barcodes per part. A team led by Masahiro Hara developed a two-dimensional code that could be read quickly from any angle. Hara has said the 1:1:3:1:1 finder pattern ratio was chosen because it is rare in printed material, which reduces false detections.

2. Open Standardization

Denso Wave holds patents on the QR code but chose not to enforce them for standard specified uses. The code was standardized as ISO/IEC 18004, first published in 2000, and later revised. The name stands for Quick Response and QR Code is a registered trademark of Denso Wave.

3. Path to Mainstream

Industrial use came first. Japanese mobile phones added QR reading in the early 2000s. Western adoption lagged until smartphone cameras began scanning codes natively, which accelerated further during the 2020s for menus, payments, and ticketing.