Windows Keyboard Tester — Test Every Key Free
A Windows keyboard tester checks every key on your keyboard — including the Windows key, Alt, Ctrl, Print Screen, Insert, Pause/Break, and the full numpad — to confirm each one registers correctly. Windows captures some key combinations at the OS level (like Ctrl+Alt+Del, Win+L, and Win key alone), but most standard keys are fully testable. This free browser-based tool is compatible with all Windows keyboard layouts including ANSI (US), ISO (UK/EU), and JIS (Japanese). It detects stuck keys, measures your keyboard's N-key rollover, and identifies keyboard ghosting without any download or installation. Works on Windows 10 and Windows 11.
Choose Your Keyboard Type
Each variant has tailored tips, rollover benchmarks, and FAQs specific to that keyboard type.
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Keys Held
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Max Simultaneous
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Keys Tested
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Coverage
Press any key to test it. Blue = held, Green = tested.
Which Windows Keys Cannot Be Tested in a Browser?
| Rollover / State | Rating |
|---|---|
| NKRO | Best |
| 6KRO | Excellent |
| 6KRO | Good |
| 3–4KRO | Limited |
| 2KRO | Poor |
Frequently Asked Questions
Why doesn't the Windows key light up in the keyboard tester?
The Windows key (⊞) is intercepted by Windows before it reaches the browser. Pressing it alone opens the Start menu, and Windows+L locks the screen — neither event is forwarded to the browser's JavaScript event listener. You can verify the physical key is working by pressing Win+D (show desktop) or Win+E (File Explorer) and checking if the shortcut triggers.
How do I test my keyboard for ghosting on Windows?
Hold down WASD + Shift + Space simultaneously while watching the Keys Held Now counter. If any key drops out while the others are held, that is ghosting. On Windows, you can also hold Ctrl + Shift + Alt + Z to test a common modifier combination. Most Windows gaming keyboards with 6KRO handle WASD + Shift + Space without ghosting.
Why can't I test Ctrl+Alt+Del with the keyboard tester?
Ctrl+Alt+Del is a secure attention sequence (SAS) in Windows — it is intercepted at the kernel level before any application (including the browser) can receive it. This is a deliberate Windows security feature to prevent malicious software from faking the login screen. The individual Ctrl, Alt, and Del keys will each light up separately when pressed alone.
Does the keyboard tester work with Windows on-screen keyboard?
No — the browser-based tester only detects physical keyboard events (keydown/keyup events from a real keyboard). The Windows on-screen keyboard (osk.exe) injects synthetic key events that are not reliably forwarded to browser tabs. Use a physical keyboard for accurate testing.
How do I test the numpad on Windows?
Make sure Num Lock is ON (the Num Lock indicator light should be lit). Then press each numpad key — 0 through 9, plus (+), minus (-), multiply (*), divide (/), decimal (.), and Enter. All of these should register individually. If Num Lock is OFF, numpad keys send navigation codes (arrows, Home, End, etc.) instead of numbers.
Why do some function keys not light up on my Windows keyboard?
Many keyboards have a Fn lock that switches F-keys between media functions (volume, brightness) and standard F1–F12 codes. If your F-keys are in media mode, pressing F5 might send 'Refresh' or 'Mute' rather than the F5 code — and the browser may or may not forward media key events. Try pressing Fn+Esc, Fn+F-Lock, or check your keyboard manual to toggle between F-key modes.
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