APDU Command Decoder

Inspect short and extended smart-card command APDUs.

Command APDU (HEX)

Open a local HEX text file

Processing stays in your browser. Inputs are not uploaded or saved.

Chip / INSPECTION

How to use it

Supports ISO short and extended command cases 1, 2, 3 and 4.

A zero short Le means 256 response bytes; a zero extended Le means 65,536.

Instruction names are context dependent. Proprietary commands retain their raw instruction code. Nothing is transmitted.

Small card. Plenty to discover.

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