Sunday, February 3, 2013

QR Codes explained [Basics]

Many times, we have seen a B/W square box with some pattern inside. These may be found in magazines, newspaper ads, posters and other print/display media. These boxes with pattern are known as QR Codes. Below an example of a QR Code for my site's URL.




QR Code (Quick Response Code) is a matrix (2D) code which contains small information such a URL, a Contact card, a bank payment and etc. This is a more powerful and quicker version of Barcode. The main difference between the two is that, while Barcode stores info in vertical lines, QR Codes can store data in both directions (can be scanned in any of the two directions). Another difference is that, a standard Barcode can store up to 30 numbers, whereas a QR code can store up to 7089 characters.

Similar to Barcode, you need a QR Code Scanner to read the information inside it. You can use a physical, web or an App scanner to read the data.  Some of the QR formats are HTML Code, PNG File, Tiff Files and etc. 

Few Links related to QR Code

QR Code generators: Kaywa, QRStuff, QuikQR, Tag

QR Code online Decoders: Zxing, Miniqr, Onlinebarcodereader

QR Scanners Apps: Google Goggles, QR Droid, QR Barcode & Scanner


Advantages
It can be used for displaying ads, product information, contact info, labels, brochures, magazines, tattoos and etc. More info can be stored in it as compared to Barcode. Whatever data is stored, it can be read with just a scan. It is widely used in Marketing, Consumer Services and Advertisement space. 

Disadvantages
Information is not visible unless its scanned. Malicious data can be hidden inside a QR Code such a URL of website that contains viruses.

 To avoid any such incidents, scan QR Codes displayed by reliable sources only.

More reads:
http://www.whatisaqrcode.co.uk/
http://en.wikipedia.org/wiki/QR_code
http://www.vincentabry.com/en/qr-code-how-does-it-work-reader-scanner-generator-decoder-675