ISO 7816-4 File System Explorer

Interactive ISO 7816-4 smart card file system explorer. Build and visualize MF (Master File), DF (Dedicated File), and EF (Elementary File) hierarchies. Explore FCI data, simulate SELECT commands, and check access conditions. Essential for smart card application design and file structure planning.

How to Use

Click any node to view its file control information. Add DFs (application directories) and EFs (data files) to build a card structure. The FCI data shows file size, type, access conditions, and lifecycle status — just like a real card's response to SELECT.

Related Tools

APDU Command Builder — Build SELECT/READ commands | EMV TLV Parser — Parse FCI template data | ISO 7816 Complete Guide