NFC Tags & RFID Explained: A Beginner's Guide

What is NFC?

NFC (Near Field Communication) is a short-range wireless technology that lets two devices exchange small amounts of data when they're brought within a few centimetres of each other. It's the same technology behind contactless payments, and every modern smartphone — iPhone and Android — has an NFC reader built in.

An NFC tag is a tiny chip with an antenna, usually embedded in a sticker, card or key fob. Tags are passive: they have no battery and are powered by the phone or reader that scans them, which is why they last for years and cost very little.

What's the difference between NFC and RFID?

NFC is actually a subset of RFID (Radio Frequency Identification). The practical differences:

NFC RFID
Frequency 13.56 MHz 125 kHz (low), 13.56 MHz (high), 860–960 MHz (UHF)
Range A few centimetres Centimetres to several metres (UHF)
Works with smartphones Yes — built into all modern phones Usually needs a dedicated reader
Typical uses Payments, automation, smart posters, business cards Access control, stock tracking, pet microchips, key fobs

If you want something anyone can scan with their phone, choose NFC. If you're building an access control or tracking system with a dedicated reader, RFID cards and fobs are often the right fit. We stock both — see our NFC tags & stickers and RFID tags, cards & readers.

NFC vs QR codes: which should you use?

NFC tag QR code
How it's used Tap phone on tag Open camera, point, focus, tap link
Friction One motion — fastest Several steps; harder in low light
Can be rewritten Yes (until locked) No — reprint required
Copyable by others Harder (physical access needed) Trivial — anyone can photograph it
Cost Cents to a few dollars per tag Free to print
Best for Counters, tables, repeat interactions, automation Posters, screens, print media, one-off links

Many businesses use both: a printed QR for posters and an NFC tag at the counter. Our "Review Us on Google" NFC stands combine an NFC chip with a printed QR code so every customer can use whichever they prefer — and we can even pre-program them for you before delivery.

Common NFC tag types: NTAG213 vs NTAG215 vs NTAG216

Most consumer NFC tags use one of three NXP chips. The main difference is memory:

Chip Usable memory Good for Get it here
NTAG213 ~144 bytes URLs, WiFi sharing, phone automation triggers — the everyday choice NTAG213 colour stickers or clear stickers
NTAG215 ~504 bytes Larger records, digital business cards, gaming applications NTAG215 hard tags or sticker packs
NTAG216 ~888 bytes Longer text records and multi-record uses NTAG216 hard tags or sticker packs

All three are rewritable (typically 10,000+ times), can be locked to read-only, and are compatible with every NFC-capable phone.

10 practical uses for NFC tags

  1. Smart home shortcuts — tap your phone on a bedside tag to turn off the lights and set an alarm.
  2. WiFi sharing — guests tap a tag on the fridge to join your WiFi, no password typing.
  3. Digital business cards — share your contact details, website or LinkedIn with a tap.
  4. Google/social review links — a review stand on the counter that opens your review page.
  5. Car mode — a tag in the car that opens maps and starts your playlist.
  6. Equipment info — stick a tag on machinery linking to its manual or service log.
  7. Pet tags — a collar tag that opens a page with your contact details.
  8. Phone automations — trigger any routine in iPhone Shortcuts or Android automation apps.
  9. Menus and info points — tables, galleries and displays linking to live content.
  10. Inventory and asset labels — quick identification for small business stock.

How to program an NFC tag with your phone

  1. Download a free app such as NFC Tools (iPhone or Android).
  2. Choose what to write: a URL, contact card, WiFi credentials, plain text and more.
  3. Tap Write and hold the tag against the back of your phone (top edge on iPhones).
  4. Done — test it by tapping the tag. To trigger phone automations instead, use iPhone Shortcuts (Automation → NFC) or an Android automation app.

Tip: don't stick standard NFC tags directly onto metal surfaces — the metal interferes with the antenna. Use on-metal tags or add a spacer. And if you'd rather skip the setup entirely, our pre-programming service can deliver tags ready to use.

Frequently asked questions

Do NFC tags need batteries?

No. Tags are passive and are powered by the phone or reader scanning them. They last for many years.

Can iPhones read NFC tags?

Yes — iPhone 7 and later read NFC tags, and newer iPhones scan automatically when the screen is on. Writing tags requires a free app.

How far away can NFC be read?

About 1–4 cm. This short range is a feature: it makes accidental or malicious scanning very difficult.

Are NFC tags secure?

Tags can be locked so their content can't be overwritten. For payments-grade security, dedicated secure elements are used — everyday tags are best for links, automation and info sharing rather than storing sensitive data.

What RFID frequency do I need for access control?

Check your existing reader or cards: 125 kHz (often labelled EM4100/TK4100) and 13.56 MHz (MIFARE) systems are both common in NZ. The two aren't interchangeable. A handheld RFID duplicator makes copying 125 kHz fobs easy, and our RFID range covers both frequencies — ask us if you're not sure which you have.

Ready to experiment? Browse blank programmable NFC tags — in stock in NZ with fast courier delivery.