What does QR stand for? The letters mean Quick Response, and they almost always appear in the phrase "QR code." A QR code is the square of black and white blocks you scan with a phone camera to open a menu, a ticket, a payment page or a web address.
The name describes the goal. The code was built so a scanner could read it fast, from any angle, even when part of it is dirty or torn. It was created in Japan in the 1990s at an auto parts company that needed a quicker way to track parts on the factory floor than the old striped bar code allowed.
Quick facts
Stands for
Quick ResponseType
Initialism, said "Q R"Usually seen as
QR codeHolds
Links, text, contact cards, Wi-Fi details, ticket dataSeen on
Menus, posters, boarding passes, packages, billsNot to be confused with
UPC bar codes
What does QR stand for in QR code?
In "QR code," Q is quick and R is response. Put together, a QR code is a code meant to get a fast reaction from a reader. Each letter is spoken separately, "kyoo ar," which makes it an initialism. People rarely say "quick response code" out loud; the short form is the everyday name.
| Letter | Word | Why it fits |
|---|---|---|
| Q | Quick | Scans in a moment, even from a slant |
| R | Response | The scan triggers an action, like opening a page |
How the little squares carry information
A regular bar code stores data in one direction, in lines of different widths. A QR code stores data in two directions, across and down, so it can hold much more in a small space, up to a few thousand characters.
- Three big corner squares tell the scanner where the code is and which way is up.
- The small blocks in the middle hold the actual data.
- Extra repair data lets the scanner rebuild parts that are smudged or covered.
That repair data is why a code with a small picture in its center can still scan.
Where you see QR codes every day
Table tent at a cafe: "Scan for menu." Point your camera at the square, tap the link that pops up, and the menu opens on your phone.
- Tickets and boarding passes: the gate scanner reads your seat and name from the code.
- Packages and returns: a shipping counter scans a code instead of printing a label.
- Bills and parking meters: a code can open a payment page.
- Posters and flyers: a code links to sign ups or event details.
- Home Wi-Fi: a code can share the network name and password with a guest.
Most links inside a code are just a URL, the same kind of address you could type by hand.
Scanning safely
A QR code hides where it leads until you scan it, so a fake sticker can send you to a fake site. Before you tap the link, look at the address the phone shows. Be careful with codes stuck on top of other signs, codes on unexpected letters, and any page that asks for a password or card number right away.
Parking lot sign: a sticker reads "Pay here, scan now." If it is pasted over the printed sign, pay at the meter or the official app instead.
QR vs bar codes and tap to pay
QR codes sit beside several other ways of reading items:
| Term | Stands for | How it is read |
|---|---|---|
| QR | Quick Response | Camera reads a square pattern |
| UPC | Universal Product Code | Laser reads striped lines at checkout |
| NFC | Near Field Communication | Tap a phone or card close to a reader |
| RFID | Radio Frequency Identification | Radio tag read without a direct view |
See more gadget letters on the tech acronyms page.
Writing QR in a sentence
QR takes capital letters and no dots. The letter Q is said "kyoo," so use "a": "a QR code." A few natural examples:
- "Scan the QR code on the back of the box to register."
- "The teacher put a QR code on the worksheet that links to the video."
- "Your ticket is the QR code in this email."
- "I printed a QR code with our Wi-Fi details for guests."
Questions people ask
What does QR code stand for?
QR code stands for Quick Response code. It is a square pattern that a phone camera or scanner can read in a moment.
Who invented the QR code?
It was developed in Japan in the 1990s by an auto parts maker, first to track car parts during manufacturing. It later spread to ads, tickets and phones.
Do I need an app to scan a QR code?
Most newer phones can scan one with the built in camera. Open the camera, point it at the code and tap the link that appears.
Can a QR code be dangerous?
The code itself is just data, but it can lead to a harmful or fake website. Check the address before you tap and avoid entering passwords from a code you do not trust.
Should QR be called an acronym?
Strictly, QR is an initialism, since it is read as two separate letters. Everyday speakers call it an acronym too, and nobody will be confused.