A faster way to track car parts
In the early 1990s, workers on automobile production lines needed to identify many different parts quickly. The barcodes then in use could store only a modest amount of information, and scanners had to read their narrow pattern of lines in the right orientation. As factories adopted more varied components, that system could slow down the flow of information.
Denso, a Japanese company that made equipment for Toyota’s automotive operations, set out to build a better tracking code. Its team developed the QR code—short for “Quick Response”—in 1994 so a scanner could capture more information at once and read it quickly on the factory floor.
Why the square changed the scan
A conventional barcode encodes data in stripes, mainly along one dimension. A QR code uses a grid of dark and light squares, encoding information both across and down. That lets it hold substantially more data in a compact mark. Three large squares at its corners help a reader locate and orient the code, so it can be scanned from different angles rather than carefully lined up like a traditional barcode.
QR codes also include error correction: extra data that can help recover the encoded information if part of the code is dirty or damaged. Those features made the format practical in a setting where labels had to be read rapidly and reliably amid busy manufacturing work.
From factory label to everyday tool
The code was designed for industrial tracking, not for phone cameras or restaurant menus. Its later usefulness beyond factories came from the same basic advantage: a small printed square could carry more information than a simple barcode and be read quickly. When phones gained cameras and software capable of scanning QR codes, the factory tool found a new audience. A mark created to keep car parts moving could now send a customer to a website with a quick scan.
