NFC keychains explained

An NFC keychain — also called an NFC keyring or NFC key — is a small tag on a split-ring with a tiny passive chip inside. No battery, no charging, no app required to read it. When an NFC-capable phone comes within about 4 cm, the phone briefly powers the chip and reads its stored data, then takes whatever action that data describes (usually opening a URL).

The chip itself is normally an NTAG213, NTAG215 or NTAG216 — the same family used in business cards and event wristbands. Memory ranges from 144 bytes (plenty for a short URL) to 888 bytes (room for a full vCard).

1. 1. Pick a keychain that fits your use

   Epoxy NFC keyrings are tough and waterproof — perfect for keys, gym bags or pet collars. PVC tags are slimmer and cheaper. For a metal-cased fob, choose an on-metal NFC keyring with a built-in ferrite shield so the chip still reads.

2. 2. Decide what should happen on tap

   Most popular: a digital business card (vCard), Wi-Fi join page, Instagram or LinkedIn profile, lost-and-found page, Emergency ID (ICE), or a payment / Revolut.me link. With Taproo you point the keyring at a dynamic destination so you can change it later without re-encoding the chip.

3. 3. Write the keychain (or skip this step)

   Use NFC Tools (free on iOS/Android), choose 'Write → URL', paste your link, then hold the phone against the chip until you see a confirmation. Every keyring from the Taproo shop ships pre-encoded — you just set the destination in the dashboard, no writing required.

4. 4. Test it on a phone

   Lock the phone, then unlock and tap it against the keyring. iPhone shows a banner you tap to open; Android opens the link directly. If nothing happens, slide the phone around — the NFC antenna sits in different spots on different models.

5. 5. Lock the chip if it lives in public

   If the keychain will be on display (a giveaway, a rented locker tag, a pet collar), use your writer app to lock it read-only so nobody can overwrite the link. Skip this if you might want to change the destination directly on the chip later — Taproo dynamic links remove this trade-off.

Blank epoxy NFC keyrings sell for roughly £6–£10 each in small quantities, and less in packs of ten or more — but you write and re-write them yourself, and a printed sticker or engraving is extra. A Taproo NFC keychain is £14 and arrives pre-encoded with a dynamic link, an engraved social icon of your choice, and a dashboard where you change the destination as often as you like.

• Blank keyring (DIY). Cheapest per unit. You need NFC Tools and you re-write the chip whenever the link changes.
• Pre-encoded dynamic keyring. £14, ready to tap, and the destination is editable forever — no writing app, no reprint.
• Bulk & giveaways. Discounts apply automatically as quantity increases; PVC tags are the cheapest option for event handouts.

Not sure which chip you need? See what is an NFC tag or the NFC code generator to create the link first.

• Antenna miss. Slide the phone slowly around the chip. The NFC coil sits at the top-back on iPhone, back-centre on most Androids.
• Touching metal. If the chip is pressed flat against keys or a fob, lift the keychain a centimetre away and try again.
• Wrong record type. iPhones only auto-launch URI/URL records. Re-write plain-text records as URLs.
• NFC turned off. On Android, check Settings → Connections → NFC. iPhones can't disable NFC, but some focus modes hide the banner.