An NFC tag is a small chip/sticker/keychain/card that stores a small amount of information and sends it to a phone when the phone is held very close to it.
NFC stands for Near Field Communication.
What NFC tags can be used for
They are usually used for quick actions without typing anything manually:
1. Open a link
For example, you tap your phone on the tag and it opens Instagram, a website, a restaurant menu, a Google Drive file, etc.
2. Share a contact
A tag can store a phone number, email address, or digital business card.
3. Connect to Wi-Fi
You can save the Wi-Fi network name and password so guests can connect with one tap.
4. Start an action on your phone
For example: turn on silent mode, start a timer, open an app, or start navigation home.
5. Smart home control
A tag near the door or on your desk can start a routine, such as turning on lights, music, or a “study mode.”
6. Identification or access
Schools, offices, gyms, or hotels may use NFC cards as passes. This requires a special access system.
What you need
You need three things:
1. An NFC tag
It can be a sticker, card, keychain, or token.
2. A phone with NFC
Most modern Android phones and iPhones support NFC. On newer iPhones, reading NFC tags usually works automatically, while writing to tags often requires an app.
3. An app to write data to the tag
For example, many Android users use NFC Tools. On iPhone, you can also use NFC Tools or automation through the Shortcuts app.
How it works in simple words
You open an app, choose what you want to write to the tag — for example, a link or Wi-Fi details — then hold the tag near your phone, and the phone writes the data to it. After that, anyone with an NFC-enabled phone can tap the tag and receive the information or action.
Important
NFC works only at a very short distance, usually a few centimeters.
Do not store private passwords, banking details, or sensitive personal information on a tag. For Wi-Fi, it is convenient, but it is better to use a guest network.
