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PC Hardware & Gamers

Interactive Keyboard Ghosting, Key Rollover (NKRO) & Switch Tester

Diagnose keyboard matrix key jamming, ghosting, and simultaneous N-Key Rollover limits with an interactive full visual layout, keystroke debounce counter, and input latency monitor.Documentation & FAQs ↓

Keyboard Key Ghosting & NKRO Latency Tester — Interactive Console
Runs locally in your browser • Instant output
Held Keys
0
Max NKRO Rollover
0
Escape
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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=
Backspace
Tab
Q
W
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R
T
Y
U
I
O
P
Bracket
Bracket
\
CapsLock
A
S
D
F
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H
J
K
L
;
'
Enter
Shift
Z
X
C
V
B
N
M
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Shift
Control
Alt
Space
Alt
Control
Event Stream: Click to focus & press any keysGreen = Registered • Orange = Held
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Step-by-Step Instructions

4 Steps to Completion
1Phase 1

Click anywhere on the keyboard test area to focus keyboard events.

2Phase 2

Press individual keys to verify registration; registered keys stay highlighted in green.

3Phase 3

Press gaming combinations simultaneously (e.g., W + A + S + D + Shift + Space) to test rollover.

4Phase 4

Check the 'Max Simultaneous Keys' badge to confirm whether your board supports full NKRO.

Practical Use Cases & Real-World Scenarios

Auditing Gaming Mechanical Keyboards
Verify manufacturer claims of full anti-ghosting and USB N-Key Rollover across all gaming clusters.
Detecting Key Chattering (Double Typing)
Identify failing mechanical switches that register double inputs from worn contacts.
Testing Spilled Liquids or Sticking Keys
Verify every key across function, navigation, and numpad rows after cleaning.
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100% free, private in-browser utility with zero server uploads.