Keyboard Tester
Press any key and see it register instantly — key name, code, and a running log. Find dead, sticky or double-typing keys in seconds.
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This key produced multiple events for one press — possible chatter (worn switch).
Is That Key Actually Broken?
Click the test area and start pressing keys: each press lights up immediately with its key name, physical code and a running history. Keys you have already tested collect in a badge list, so you can sweep the whole board methodically and spot the one that never registers.
The classic diagnoses: a key that does not appear at all (dead switch or cable), one that fires twice per press (chatter — the counter jumps by 2), or one that only works when pressed hard (failing membrane). Everything runs locally in your browser; no keystroke is transmitted anywhere, and the log clears when you leave.
Frequently Asked Questions
A key shows nothing here — is the keyboard broken?
First test in another app to rule out software. Some keys are reserved by the operating system or browser (Fn, some media keys, Windows/Command in certain combos) and never reach a web page — that is normal, not a fault.
What is keyboard chatter?
A worn switch registering two or more presses for one physical hit. Here it shows as the press counter jumping by more than one. Mechanical keyboards can often fix it per-switch; membrane boards usually need replacement.
Are my keystrokes recorded or sent anywhere?
No. Events are handled by JavaScript in your browser and shown on screen only; nothing is stored or transmitted.
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Keyboard Tester