How this test works
Reads KeyboardEvent code and key only while the test area is focused.
ObservedPrecision label
P0 browser diagnostic
Keyboard Test
See keydown and keyup events, held keys and tested-key coverage.
ObservedBrowser-nativeLocal processing
KB
Interactive test
Keyboard diagnostic
◆Stays on deviceNo raw hardware upload
Tested 0Held now 0Last event —
Your data flow
Key events stay local and are not stored or sent to analytics.
Read the privacy overview →What this cannot prove
- Browsers may intercept system shortcuts and media keys.
- Received events cannot prove electrical switch health.
Fix common problems
- Click the test area before pressing keys.
- Retry without OS-reserved shortcuts.
- Compare event.code with event.key for layout differences.