Keyboard Ghosting Test

Hold multiple keys to inspect simultaneous key detection, rollover behavior, and missed key-up events.

Click here, then hold several keys together.

0Keys held now

0Maximum simultaneous

0Unique codes seen

0Key-up events

This reports keyboard events delivered to the browser. It can reveal missed combinations, but it is not a laboratory measurement of the keyboard matrix or USB report protocol.

How to use this Keyboard Ghosting Test

Test how many keyboard keys your browser receives at the same time. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.