About this tool

This is the complete keyboard testing suite: a full on-screen layout — letters, numbers, function row, navigation cluster, numpad, and multimedia keys — that highlights each key the moment you press it, with a slim live readout showing exactly which key and code just fired.

The layout is built from physical key codes (KeyboardEvent.code), not characters, so it stays accurate regardless of your OS keyboard layout or language settings. A compact "pressed key" bar above the board shows the live key label, code, and any active modifiers (Ctrl, Shift, Alt, Meta) the instant you press something, then reverts to a waiting state on release without shifting the layout below it. Multimedia keys (volume, playback, browser, calculator, sleep/wake, print screen) light up wherever your browser and OS expose them, with no errors if they're not supported.

Key features

• Complete visual layout including function row, modifiers, arrow keys, navigation cluster and numpad
• Slim, fixed-height "pressed key" bar showing key label, physical code, and active modifiers
• Physical-key-code based highlighting, layout-independent of OS language settings
• Multimedia key detection (volume, playback, browser navigation, calculator, sleep/wake, print screen) where exposed by the browser
• Live "X of Y keys tested" counter tracking unique keys confirmed working
• Held keys glow at full emphasis; released keys stay marked as tested in a distinct color
• Stuck-key protection — held keys automatically release if the browser tab loses focus
• One-click reset to start a fresh test pass

Why use it

• Systematically confirm every single key on a keyboard, including numpad and multimedia keys, in one pass
• Essential first check before buying or reselling a used mechanical or membrane keyboard
• Spot dead or unresponsive keys that are easy to miss during normal typing
• Pinpoint exactly which physical key fired, useful for confirming left/right duplicate keys like Shift or Ctrl

Why keyboard tester testing matters

Membrane and budget mechanical keyboards often use a matrix circuit that can only recognize a limited number of simultaneous key presses along the same rows and columns — this is what causes "ghosting," where pressing three keys together makes a fourth, unintended key appear to register. Gamers relying on combos like WASD + Shift + Space need to know their rollover limit before it costs them in a real match.

Tips for accurate results

• Press every key on the layout at least once, including modifiers (Shift, Ctrl, Alt, Win) and function keys — some browsers intercept a handful of system shortcuts, so a missed key isn't always a hardware fault.
• Hold down common gaming combinations (WASD+Shift, arrow keys+Ctrl) to find your keyboard's real rollover limit.
• If a key repeats or sticks, check for physical debris under the keycap before assuming switch failure.
• For typing speed, run at least 2–3 attempts — the first is usually slower as you adjust to the prompt text.

Frequently asked questions