Cardtool Exe -

@echo off :loop cardtool status | find "Card inserted" > nul if %errorlevel% equ 0 ( echo [%date% %time%] Card detected! cardtool transmit /APDU "00 A4 04 00 00" > card_data.log timeout /t 5 > nul ) else ( timeout /t 1 > nul ) goto loop cardtool.exe is a hidden gem for smart card developers and system integrators. While it lacks a modern UI and extensive help files, its ability to speak raw APDU to any card makes it invaluable for debugging and automation.

If you’ve ever worked with smart cards, digital signatures, or hardware-based certificates on Windows, you’ve likely heard of certutil.exe . But lurking in the shadows of C:\Windows\System32 is a lesser-known but equally powerful utility: cardtool.exe .

Do you use cardtool.exe in your workflow? Have a favorite APDU command? Share it in the comments below!

cardtool readerstatus \\.\READERNAME This is the power-user feature. You can send raw APDUs (hex bytes) to a card. For example, to select the Master File on many Java Cards: