QR Code

To create a QR-code, use the dCode form at the top of this page.

As a developper, to code a QR-code program, a QR code uses the ISO norm 18004:2015 (QRCode).

Example:

To read QR-Code, a quick and free solution is a mobile phone. It exists a bunch of applications, often it's integrated into the Camera app. Else use Google Goggles here (link) or Google Lens here (link) (which has plenty of other use)

Without smartphone, on Internet:

Example: X-Zing takes a URL or an image to decode barcodes here (link)
Online Bar Code Reader, another universal tool not limited to QR code here (link)

The 2D bar code has generally 3 black squares in the corners and a matrix of black and white dots.

QR stands for Quick Response.

A QR code has no time limit (no lifespan), nor a maximum number of uses. However, if the data contained in the QR code has a lifetime (like an address of a web page) then the QR code will still exist even if the web page no longer exists.

The center of the QR-Code is sometimes non-coding and therefore used to incorporate a logo. Otherwise, there are many other 2D barcodes like DataMatrix (FlashCode), Aztec, PDF 417, etc.

First QR codes were published in Japan in 1999.