NFC tag reader and writer for Android

An online tool for reading and writing NFC tags in the phone browser. It works in Chrome, Samsung Internet and Opera on Android: it shows what a tag holds in plain words, writes a link, Wi-Fi network, business card, text or phone number, copies tags and locks them against rewriting. On an iPhone or a computer you can prepare the record and open it on an Android phone with a QR code.

How to write an NFC tag

1

Open this page in Chrome on an Android phone and turn NFC on.

2

Choose “Read”, “Write” or “Copy” at the top of the tool.

3

To write, pick what goes on the tag — a link, Wi-Fi, contact — and fill in the fields.

4

Press the button and hold the tag to the back of the phone until the check mark.

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Write a link, Wi-Fi or contact to a sticker and see what any tag holds

Press “Start reading”, then hold a tag to the back of the phone.

The antenna is usually in the middle of the back or near the camera. Hold still until the check mark.

The tag’s contents will appear here

Links, Wi-Fi networks, contacts, text, phone numbers and app records — each in plain words, with the bytes underneath.

No browser reads bank cards, transit cards, intercom keys or office passes: their memory is protected or speaks another protocol.

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What it does

Byte count before the touch
You see how many bytes the record takes and whether it fits on NTAG213 (137 bytes), NTAG215 (492) or NTAG216 (868) — before the tag refuses it.
Wi-Fi on a sticker
The network goes on the tag in the Wi-Fi Simple Configuration format: an Android phone joins it at a touch, without typing the password.
A tag in plain words
A link with the real site address and a warning for short links, a network with its password, a contact you can save as .vcf, the bytes of anything unknown.
Copies and batches
Copy a tag to any number of blank ones, give each tag its own line from a list or a numbered address, and skip a tag that was already written by its serial number.
Erase and lock
Clear a tag down to one empty record, or lock it for good so nobody can rewrite it. Before overwriting, the old record is kept so you can put it back.
Prepare on a computer
On a computer or iPhone the whole record editor works; the finished record opens on an Android phone from a QR code.

FAQ

Can an iPhone read or write tags from this page?

No. Apple does not let websites use the iPhone’s NFC chip — in Safari or in Chrome. Reading and writing from a page works only on Android, in Chrome, Samsung Internet or Opera. An iPhone XS or newer still reads tags with a link, phone number or e-mail on its own: hold the tag to the top edge of the phone with the screen on. You can also prepare the record on the iPhone and open it on an Android phone with the QR code the tool shows.

Why does my bank card, transit card or door key not read?

They are not NDEF tags. Bank cards follow the EMV payment protocol, many transit cards and passes are MIFARE Classic or DESFire with protected memory, and most intercom keys work at 125 kHz, which phones cannot hear at all. A browser only reads tags in the NFC Forum format — ordinary NTAG and Ultralight stickers, cards and key fobs.

The phone does not notice the tag. What should I try?

Check that NFC is on in the quick settings. Then move the tag slowly across the back of the phone: the antenna is usually in the middle or near the camera. A case thicker than about 3 mm, a metal plate for a magnetic holder, or a tag stuck directly on metal blocks the field — for metal surfaces there are special on-metal tags.

Which tag do I need for Wi-Fi or a business card?

A Wi-Fi network with a normal name and password takes 90–110 bytes and fits on an NTAG213. A business card with name, phone, e-mail, company and website often takes 150–250 bytes and needs an NTAG215. The tool counts the bytes as you type and names the smallest chip the record fits on.

Can a locked tag be unlocked?

No. Locking sets one-way bits in the chip: after that the tag can only be read, by anyone, forever. That is useful for a tag in a public place that strangers could otherwise rewrite, but check the record before you lock it.

Will an iPhone open my tag?

It depends on the record. Links, phone numbers, e-mail and SMS open on an iPhone without any app. A Wi-Fi network, contact, plain text or an Android app record do not — for Wi-Fi guests with an iPhone, place a QR code of the network next to the tag. The tool shows who can open each record while you write it.

Does copying make an exact clone of the tag?

It copies every record byte for byte, so the copy does the same thing when touched. The serial number is different: it is burned into each chip at the factory and cannot be changed. A system that checks the serial — a door lock, a loyalty card — will see a different tag.

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Who is this tool for?
🔌 Electronics Enthusiasts 📋 Productivity
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