QR Code

QR code is in fact a 2 dimensional bar code or matrix code established in the year of 1994 by a Japanese Corporation namely Denso Wave. The term “QR” means Quick Response as the originator wanted this code to permit its all content to be deciphered at very high speed. These codes are mostly used in Japan and therefore they are presently the most famous type of 2 dimensional codes. In addition, most present Japanese handsets can also read these codes using their integrated camera.

Learning and teaching opportunities

This code enables students to grab key contents of PowerPoint slide instantly onto their handsets. It also provides useful links to extra information on clothing, posters or slides.

This code can contain web links, SMS messages and plan text messages of length up to around 250 characters. It actually connects real world to virtual world. PowerPoint Slides, Microsoft document, displays, artifacts, posters and even trees or buildings can exhibit QR codes positioned on them. Interested individuals can make use of their handsets to capture the photograph of this cryptogram, which, then can be interpreted instantly virtually, it has the benefit of moving data easily and accurately from electronic presentation or print onto the device of learner. Some important benefits of these codes are:

– Operated only on standard handsets

– Eradicate all transcription errors, particularly functional for URLs.

QR code is actually in an ‘open format’ and the specification of the format has been made available by its owners.

Error correction and data capacity of the code

This code can support maximum 7,089 characters for numeric, 4, 296 characters for alphanumeric, 2, 953 bytes for binary and maximum 1, 817 characters for Kana or Kanji. Different levels of maintained for the code like Level H, Level Q, Level M and Level L. The capacity for error correction for different levels is as:

– For Level L, individuals can restore around seven percent of codeword.

– For Level H, persons can restore around fifteen percent of codeword.

– For Level Q, individuals can restore around twenty five percent of codeword.

– For level H, one can restore around thirty percent of codeword.

The code implements error correction technique of Reed Solomon.


‘Micro QR Code’ is a small version of QR code for applications having less capability to grip larger scans. Besides, there are also various other forms for this version and the highest one can hold maximum of 35 characters.

Design of this code also allows for incorporating stunning images, photos, characters and logos without losing even minutest piece of information.

Though used for trailing different parts of vehicles during manufacturing initially, these are now-a-days used in broader context including convenience oriented operations addressed to handset users and business tracking applications. The codes storing URLs and addresses may appear on signs, in magazines, business cards, on buses or other objects that individuals might require information about.


QR code can be generated by uses by themselves and get their codes printed for other people to scan and then use by browsing a free code generating website.