NFC Tag NDEF Writer Simulator
Simulate writing NDEF messages to NFC tags before touching a physical card. Compose Text, URI, and Smart Poster records, select a target tag, and see exactly how much memory your message consumes — including NDEF TLV overhead, CC bytes, and lock bytes. No guessing, no wasted tags.
1. Select Target Tag
2. Compose Records
3. Memory Simulation
Add records to simulate
How to Use
1. Select your target NFC tag type — each has different usable NDEF capacity.
2. Add Text, URI, or Smart Poster records to build your NDEF message.
3. Watch the memory bar fill in real time. Green = fits, Yellow = tight, Red = over capacity.
4. Copy the hex and test it in our NDEF Parser or write it to a physical tag.
Related Tools
NDEF Message Parser — Decode hex NDEF | NFC Tag Capacity Calculator — Full tag comparison | MIFARE Access Bits — Sector trailer perms