How to use it
Follow the on-screen instructions several times and compare repeated attempts rather than one score.
Keyboard N-Key Test
Check every key, maximum simultaneous input and keyboard ghosting.
Click here, then press keys
EscapeF1F2F3F4F5F6F7F8F9F10F11F12
`1234567890−=Backspace
TabQWERTYUIOP[]\
CapsLockASDFGHJKL;'Enter
Shift LZXCVBNM,./Shift R
Control LMeta LAlt LSpaceAlt RMeta RControl R←↑↓→
InsertDeleteHomeEndPageUpPageDownPrintScreenScrollLockPause
NumLockN ÷N ×N −N 7N 8N 9N +N 4N 5N 6N 1N 2N 3N 0N .N ↵
Pink: held · Green: tested
Pressed now
0
Keys detected
0
Maximum simultaneous
0
Hold multiple keys to check ghosting and N-key rollover. Keys are measured only while this area is focused. Tab or Esc leaves it; browser shortcuts stay available. Mobile needs a physical keyboard.
TOOL GUIDE
When to use it
Content reviewed · 2026-07-24
Check every key, maximum simultaneous input and keyboard ghosting.
Before you rely on the result
Results can vary with the browser, operating system, display, and input device.
Data handling
Values are used only on the current screen and are not sent or stored separately.
Related tools
A few tools that fit naturally with this task.
Tests & devices
Dead Pixel & Retention Test
Cycle full-screen solid colors to inspect pixels and image retention.
Tests & devices
Mouse Click, Wheel & Double-Click Test
Check left, middle and right clicks, wheel direction and browser double-click events. Not a hardware fault diagnosis.
Tests & devices
Reaction Time Test
Click when the screen changes color and measure your reaction time in milliseconds.