QR Codes

What is a QR Code? 

A QR code  (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional barcode) first designed for the automotive industry in Japan. A barcode is a machine-readable optical label that contains information about the item to which it is attached. A QR code uses four standardized encoding modes (numeric, alphanumeric, byte / binary, and kanji) to efficiently store data; extensions may also be used.

Storage. 

The amount of data you can store depends on three factors: the type (numeric, alphanumeric ...) data, version (indicates the density of the QR code) the level of error correction (higher error correction, lower capacity).

Data Types

-Numeric only. Max. 187 characters (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
-Alphanumeric. Max. 114 characters (0-9, AZ [uppercase only]) -.> Less than Twitter.
-Binary / Byte Max. 78 characters .

Surely, this type is the most common, as it is sufficient to store a web address.

Version or Density



Generating QR codes 

These pages take you to generating QR codes:

-Kaywa. Generate your own QR codes, for example, the code in the illustration was created using this page and contains a URL. Use your phone to scan the code and navigate there.
-QR Stuff. QR generates slightly more sophisticated codes. On this page you can generate codes to navigate pages on YouTube, Facebook and LinkedIn, among others.