Tool to generate a QR-Code. QR code is a 2D barcode standard made of black and white squares, recognizable with three smaller squares in its angles.
QR Code - dCode
Tag(s) : Character Encoding, Image Processing
dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!
A suggestion ? a feedback ? a bug ? an idea ? Write to dCode!
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:
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.