Keyboard Tester
Test every key, spot chatter, and check multi-key combinations in your browser.
How to Use the Keyboard Tester
Click Focus tester, then press keys on your keyboard. The matching key lights up while held, stays marked after release, and records a press count. Use the event log to confirm the exact key code your browser received.
What to Check For
Stuck Keys
A key that appears in the current-combination display when you are not pressing it may be physically stuck or sending a continuous signal. This is common on keyboards that have had liquid spilled on them.
Dead Keys
If a key does not highlight or appear in the event log when pressed, either the switch has failed or the key is not being recognised by your operating system. Try pressing it in a text editor to confirm.
Double-Triggering
Mechanical keyboard switches can develop "chatter" — where one physical press registers as two keystrokes. Test by pressing a suspect key slowly and watching the press badge and event log. If the count jumps twice from one physical press, that switch may be chattering.
Ghosting and Rollover
Hold several keys at once and watch the current-combination display. If one of the keys you are physically holding does not appear, that combination may exceed your keyboard's rollover support.
Layout Differences
If you've switched between keyboard layouts (e.g. QWERTY to Dvorak, or UK to US), this tester helps you verify which physical key maps to which label in your current OS layout.
Is It Safe?
Yes. All key detection happens locally in your browser using JavaScript event listeners. No keystrokes are recorded, transmitted, or stored anywhere.
Ready to Type?
Once your keyboard is confirmed working, take a 1-minute typing test to see your current WPM, or try a targeted practice session to work on specific keys.