Free RFID & NFC Tools

Five browser tools we built while curating the datasheet library. Each runs entirely in your browser — no login, no upload, no tracking. Every calculation is traceable to the official datasheet or standard.

• Tool

  NDEF Capacity Calculator

  How many bytes will fit on your NFC tag?

  Pick a chip, pick a payload (URL / text / vCard / Wi-Fi) and see remaining bytes live — with NDEF URI-prefix compression accounted for.

• Tool

  UHF Read-Range Estimator

  Friis-equation range for any UHF tag chip.

  Region (US 36 dBm EIRP / EU 33 dBm ERP), tag sensitivity in dBm, antenna gain, frequency — get theoretical free-space range plus a realistic 40-70% band.

• Tool

  EPC SGTIN-96 Encoder / Decoder

  24 hex characters ⇄ GTIN + serial.

  Bidirectional. Decode a raw EPC into header, filter, partition, GS1 company prefix, item reference, serial — or encode a GTIN-14 + serial back to 96-bit hex.

• Tool

  Chip Memory Map Visualizer

  See UID, lock bytes, config pages and user memory.

  Colour-coded memory layouts for NTAG 213/215/216, MIFARE Classic 1K/4K, MIFARE Ultralight EV1, T5577 and ICODE SLIX — traceable to the official datasheets.

• Tool

  Embeddable Comparison Widget

  Copy-paste iframe of any 2-3 chip comparison.

  Free for any site — pick chips, pick light or dark, grab the snippet. Widget footer links back to rfid-datasheet.com.