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Kordu Tools
Gaming Runs in browser Updated 30 Mar 2026

Keyboard Tester

Test every key on your keyboard with a visual layout. Detect ghosting, verify N-key rollover, and identify stuck keys. Works with any keyboard type — mechanical, membrane, USB, or Bluetooth.

Keys pressed0/74
Max simultaneous0
Esc
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
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1
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0
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Back
Tab
Q
W
E
R
T
Y
U
I
O
P
[
]
\
Caps
A
S
D
F
G
H
J
K
L
;
'
Enter
Shift
Z
X
C
V
B
N
M
,
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/
Shift
Ctrl
Win
Alt
Space
Alt
Win
Menu
Ctrl
Last key pressed
Activate the tester above to begin
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How to use Keyboard Tester

  1. Open the keyboard tester

    Navigate to the keyboard tester page. The visual keyboard layout loads instantly — no setup, drivers, or downloads required.

  2. Press keys to test them

    Press any key on your keyboard. Each key highlights on the visual layout to confirm it registered correctly. Keys that don't light up have a registration problem.

  3. Test N-key rollover and ghosting

    Hold down multiple keys at once to check how many simultaneous presses your keyboard registers. The live counter shows the maximum simultaneous keys detected — useful for verifying anti-ghosting claims.

  4. Test gaming key combinations

    Press key combinations you use frequently in games (W+A+Space, W+D+Shift, etc.) to verify none are blocked by ghosting or rollover limitations.

  5. Review key event data

    Check the info panel for real-time event data including event.code, event.key, and keyCode for the last pressed key — useful for debugging custom remaps.

Keyboard Tester FAQ

What is N-key rollover (NKRO)?
N-key rollover means your keyboard can register any number of simultaneous key presses accurately. Cheaper keyboards often have 6-key rollover (6KRO) — only 6 keys at once. Gaming keyboards advertise NKRO (unlimited). This tool counts the maximum simultaneous keys detected to verify your keyboard's actual rollover capability.

What is keyboard ghosting?
Ghosting occurs when pressing multiple keys causes additional phantom keypresses to register that you didn't actually press. Anti-ghosting prevents this by isolating each key's circuit. Test by pressing 3–4 keys simultaneously — if unintended keys light up, your keyboard is ghosting.

Why do some keys not work in the browser?
System-level shortcuts like Ctrl+W (close tab), Alt+F4, Win/Super key, and Ctrl+T are intercepted by the OS or browser before reaching the page. The tester prevents most default browser shortcuts, but OS-level key intercepts cannot be overridden.

Does this work with mechanical keyboards?
Yes. The tester works with any keyboard type — mechanical (Cherry MX, Gateron, Kailh, Topre), membrane, scissor-switch laptops, USB, Bluetooth, and wireless. It reads standard browser keyboard events which are hardware-agnostic.

How do I test if my keyboard has true NKRO?
Hold down 10 or more keys simultaneously and check the simultaneous key counter in the tool. True NKRO keyboards register all of them. 6KRO keyboards cap at 6. Note: USB NKRO sometimes requires enabling NKRO mode in the keyboard's firmware (usually a key combo at boot).

Is my typing data sent anywhere?
No. All key detection runs entirely in your browser. No key presses, event data, or usage information is transmitted anywhere. The tool does not collect input.

Can I test if my keyboard is mechanical or membrane?
The tool can't detect keyboard type from key events alone, but you can infer it from rollover test results. True NKRO is almost always a mechanical or high-end membrane feature. If you're limited to 6 simultaneous keys, your keyboard likely uses standard USB HID 6KRO polling.

What gaming keyboards work best with this tester?
All gaming keyboards work — the tester is hardware-agnostic. Common keyboards tested include Logitech G Pro X, Razer BlackWidow, SteelSeries Apex Pro, Corsair K70, and Ducky One 3. If any key fails to register on this tester, it confirms a physical or switch-level problem.

Background

Diagnose your keyboard with an interactive visual layout that highlights every key as you press it — no software to download or install. Instantly detect ghosting issues by pressing multiple keys simultaneously and verify N-key rollover (NKRO) support, with a real-time counter showing the maximum simultaneous key presses detected.

The tool shows raw key event data including event.code, event.key, and keyCode for every press — useful for debugging custom key mappings, identifying hardware faults, and checking if a specific key registers correctly after modification or cleaning.

Works with any keyboard connected to your computer: mechanical with Cherry, Gateron, or Kailh switches; membrane; scissor-switch laptops; USB; Bluetooth; or wireless 2.4 GHz receivers. Ideal for testing gaming keyboards before competitive play or checking a new purchase without leaving your browser.

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