ATR Parser

Decode ATR (Answer to Reset) hex strings: initial character, interface bytes, and card identification.

Enter the Answer-to-Reset bytes in hexadecimal (spaces optional)

Byte Breakdown

Field Hex Description
Protocol
Convention
Historical Bytes

Frequently Asked Questions

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.