What is Near Field Communication and what are NFC Tags

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NFC (Near Field Communication) is an evolution of RFID technology; NFC enables secure wireless connectivity between two devices, with related exchange of data.
NFC technology, applied to a smartphone or a tablet, allows:

  • the exchange of information between two devices, totally safe and quick, simply by approaching (via Peer-to-peer);
  • to make quick and protected payments with mobile phones (via HCE);
  • to read or write NFC Tags.

What are NFC Tags

NFC tags are RFID transponders that operate at 13.56 MHz. They are tiny chips (integrated circuits) connected to an antenna. The chip has a unique ID and a part of rewritable memory. The antenna allows the chip to interact with an NFC reader/scanner, like an NFC smartphone.

You can write information on the available memory of an NFC Chip. This information can be easily read (and executed) by NFC device, like a smartphone or a tablet. You just have to tap the Tag with your device.

See the list of NFC-enabled Smartphones and Tablets

Size and format

The most common form of NFC tag is sticker, which is a label that contains the circuit and the antenna. Thanks to their small size, however, NFC tags can be easily integrated into multiple supports, such as a card, a wristband, a key ring, a gadget, etc. An object equipped with NFC Tag can be uniquely identified thanks to the unique code of the chip.

Power Supply

A very interesting feature of NFC tags is that they do not need any direct power supply, because they are activated directly by the magnetic field of the NFC sensor of the mobile phone or the device that reads them. A Tag can then remain glued to an object for years and continue to function without problems.


The available memory of NFC tags varies according to the type of chip, but generally in the most common ones it is less than 1 kilobyte. This may seem like a limitation, but in reality only a few bytes are enough to get amazing functions, thanks to the NDEF standard, the data format for the NFC encoded by the NFC Forum. One of the most common functions in marketing, for example, is the programming of a URL that refers to a web page. The Tag, so programmed, can be applied to any object, brochure, flyer. With this function, they are similar to a QR Code, but are equipped with a greater data capacity, which makes them useful in the case of reports and campaign analysis. In addition, they can be customized with their own graphics and do not require, at least for Android, any application to be read. In addition, the memory of an NFC Tag is divided into several blocks, which can be used for the development of more complex applications (inventory, medical card, etc.).

Unique ID

All NFC Tags have a unique code, called UID (Unique ID), located in the first 2 pages of the memory, that are locked (can not be changed nor deleted). Through the UID, you can uniquely pair an NFC Tag to an object or a person, and develop applications that identify and interact with them.

What kind of information can be written on NFC Tags?

On NFC Tag you can writte a lot of types of information. Some of these are for private use:

  • enable/disable Wi -Fi
  • enable/disable the Bluetooth
  • enable/disable the GPS
  • open/close an application
  • and so on...
The NDEF format
Then there are other types of commands, which we can define as "standard", because they use the NDEF format (NFC Data Exchange Format), defined by the NFC Forum specifically for the programming of NFC tags. To read and run these types of commands on a smartphone, in general, no apps are installed on your phone. The iPhone exceptions. The commands defined as "standard" are the following:
  • open a web page, or a link in general
  • open the Facebook app
  • send emails or SMS
  • start a phone call
  • simple text
  • save a V-Card contact (even if it is not a universal standard)
  • start an application (only applies to Android and Windows, made with the relative operating system)

Given the transversal nature of these applications, they are often used for marketing purposes.

    Compared to UHF RFID tags, NFC tags also have the advantage that you can easily read them by a cheap phone and write them by yourself with a free application (Android, iOS, BlackBerry or Windows).

    To read an NFC Tag no App is required (except for some iPhone models): you just need that the NFC sensor is activated (generally, it is active by default as it is irrelevant for battery consumption).

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