RFID and NFC tools
Free utilities for the checks that come before an RFID or NFC order, such as how many bytes a record needs, which chip will hold it and which UHF band the tags will be read on. They run in your browser, with no sign-up.
Updated
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NDEF Generator & NFC Tag Capacity Checker
Build a URL, phone, email, SMS, text or vCard record, see its exact bytes and check whether it fits NTAG213, NTAG215, NTAG216 or NTAG 424 DNA.
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UHF RFID Frequency by Country
Look up the UHF RFID bands, reader power limits and technique GS1 lists for each country, and the inlay tuning to start from for tags read there.