APDU Command Builder
Construct valid ISO 7816-4 APDU commands by selecting command type, parameters, and data. Generates the complete hex string and provides a byte-by-byte breakdown with color-coded fields.
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Questions fréquemment posées
Yes, all tools on SmartCardFYI are completely free with no account required. Tools run entirely in your browser (client-side JavaScript) and do not send your data to any server, ensuring privacy for sensitive information like APDU commands, ATR strings, or AID bytes.