Quick answer
A QR code (Quick Response code) is a two-dimensional barcode that stores data — a link, contact details, WiFi credentials, text — as a pattern of black and white squares. Scanning it with a phone camera reads that data instantly, without typing anything.
How Is It Different From a Regular Barcode?
A traditional barcode — the kind on a grocery item — stores data in one direction, as a series of vertical lines. It typically holds only a short product number and has to be scanned in a specific orientation. A QR code stores data in two dimensions (both across and down), which lets it hold far more information — a full web address, a contact card, or a paragraph of text — and it can be scanned from almost any angle.
Where Did QR Codes Come From?
QR codes were invented in 1994 by Masahiro Hara, an engineer at Denso Wave (a subsidiary of Toyota), to solve a factory problem: tracking automotive parts through the manufacturing process faster than the barcodes of the time allowed. Denso Wave deliberately chose not to enforce its patent rights, which is a big part of why QR codes became a free, universal standard instead of a proprietary one — anyone can generate and use them without a license.
What Are QR Codes Used For Today?
- Opening a website or landing page instantly
- Saving a contact's name, phone, and email to your phone
- Joining a WiFi network without typing the password
- Paying for something via a payment app
- Checking in at an event or boarding a flight
- Reading a product's ingredients or authenticity details on packaging
Frequently Asked Questions
Who invented the QR code?
QR codes were invented in 1994 by Masahiro Hara at Denso Wave, a subsidiary of the Japanese automaker Toyota, to track parts through car factories faster than the barcodes used at the time.
Why is it called a 'QR' code?
QR stands for 'Quick Response' — the goal was letting a scanner decode the data almost instantly, much faster than a standard barcode of the era.
Do I need a special app to scan a QR code?
No. Every modern iPhone and Android phone can scan a QR code directly from the built-in camera app — just point it at the code and a notification appears to open it.
Can a QR code contain a virus?
A QR code itself is just data — text — and can't run code on its own. The risk is the same as clicking any unfamiliar link: only scan codes from sources you trust, and check the preview URL before opening it.
Make Your Own QR Code
Free, no sign-up — generate a QR code for a URL, contact card, WiFi network, text, or phone number.