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Kordu Tools

Keyboard Tester

Test every key on your keyboard with a visual layout. Detect ghosting, check N-key rollover, and verify all keys register correctly.

Keys pressed0/74
Max simultaneous0
Esc
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
`
1
2
3
4
5
6
7
8
9
0
-
=
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
,
.
/
Shift
Ctrl
Win
Alt
Space
Alt
Win
Menu
Ctrl
Last key pressed
Press any key to see its event data

How to use

  1. 1

    Open the keyboard tester

    Navigate to the keyboard tester page. The visual keyboard layout loads instantly with no setup required.

  2. 2

    Press keys to test them

    Press any key on your keyboard. Each key lights up on the visual layout to confirm it registered correctly.

  3. 3

    Test N-key rollover

    Hold down multiple keys at once to check how many simultaneous key presses your keyboard supports. The max simultaneous count is displayed in real time.

  4. 4

    Check for ghosting

    Press key combinations you use frequently, especially in games, to verify none are blocked by ghosting. Any key that fails to register will remain unlit.

  5. 5

    Review key event data

    Check the info panel for detailed event data including event.code, event.key, and keyCode for the last pressed key.

Frequently asked questions

What is N-key rollover (NKRO)?
N-key rollover means your keyboard can register any number of simultaneous key presses. Cheaper keyboards often have 6-key rollover (6KRO), meaning only 6 keys can be detected at once. This tool counts the maximum simultaneous keys detected so you can verify your keyboard's rollover capability.
What is keyboard ghosting?
Ghosting occurs when a keyboard fails to register a key press because too many keys in the same circuit are already held down. This is common on membrane keyboards and budget mechanical keyboards. Use this tool to test problematic key combinations.
Why do some keys not work in the browser?
Certain system-level key combinations (like Ctrl+W, Alt+F4, or the Windows/Super key) are intercepted by the operating system before they reach the browser. The tool prevents most default browser shortcuts, but OS-level shortcuts cannot be overridden.
Does this work with any keyboard?
Yes. The tester works with any keyboard connected to your computer — mechanical, membrane, laptop, USB, Bluetooth, or wireless. It reads standard browser keyboard events which are hardware-agnostic.
Is my keyboard data sent to a server?
No. All key detection happens entirely in your browser. No key presses, event data, or usage information is transmitted anywhere.

Test your keyboard with an interactive visual layout that highlights every

key as you press it. Instantly detect ghosting issues, verify N-key rollover

(NKRO) by pressing multiple keys simultaneously, and confirm every key

registers correctly. The tool shows real-time key event data including

event.code, event.key, and keyCode values — useful for debugging key

mappings and identifying hardware problems. Everything runs in your

browser with zero latency. Works with any keyboard layout or connection

type: mechanical, membrane, USB, Bluetooth, or wireless.

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