USB-C Cable E-Marker Decoder & Compatibility Checker

Reading a USB-C cable e-marker with a USB tester

USB-C cables that support more than the most basic features (60 W power and USB2 data) have a tiny chip inside, the e-marker, that reports what the cable claims to support. This tool decodes those reported capabilities and checks the fields for conflicts:

Enter the Cert Stat / XID to check it against the USB-IF public registry for a matching listing, its recorded status, and other products associated with the same XID.
Decode the chip's data to see its reported power rating, data speed, and Thunderbolt and USB4 support.
Run over 150 checks against USB and Thunderbolt 3 rules to flag invalid encodings and reported capabilities that contradict one another.
Share your results with a link so others can see the cable's data and tell whether it has any issues or problems.

To get started, read your cable with an inexpensive USB-C tester like the KM003C and copy the hex values from its screen into the matching fields below.