Keyboard Tester – Test Every Key Online

Windows vs Mac keyboards

Windows and PC keyboards feature Ctrl, Windows (Win), and Alt modifier keys, along with a dedicated Context Menu key and standard F1–F12 function rows. Mac keyboards use Control, Option (⌥), and Command (⌘) modifier keys. In browser events, MetaLeft and MetaRight correspond to the Command key on macOS and the Windows key on PC, while AltLeft and AltRight represent Option on Mac and Alt on Windows. Full-size Apple keyboards also feature extended function keys F13 through F19 above the navigation and numeric keypad areas.

ANSI vs ISO keyboard layouts

The physical standard dictates key geometry and placement. ANSI (predominant in North America) features a wide, single-row rectangular Enter key and a long 2.25u left Shift. ISO (standard across Europe and many international regions) features a taller two-row inverted-L Enter key, a shorter 1.25u left Shift, and an additional physical key (IntlBackslash) situated immediately between left Shift and Z. Our layout selector lets you switch between ANSI and ISO geometry so the on-screen model mirrors your physical hardware.

Keyboard form factors: Full Size to 60%

Keyboards come in various sizes tailored to different desk spaces and ergonomics. Full Size (100%) includes the function row, navigation cluster, arrows, and a 17-key numeric keypad. Tenkeyless (TKL / 80%) removes the numpad while preserving full navigation and arrow keys. 75% boards compress the function row and arrows into a compact footprint. 65% boards eliminate the dedicated function row while keeping arrow keys. 60% keyboards strip down to the core alphanumeric typing block. Laptop layouts typically integrate navigation and arrows directly into the main deck.

QWERTY, QWERTZ, AZERTY and Dvorak

Character layouts dictate how printed key legends map to characters. QWERTY is standard for English, QWERTZ swaps Y and Z for Central European typing, AZERTY adapts letter placement for French, and Dvorak groups vowels on the home row for ergonomic efficiency. Because physical testing is driven strictly by physical KeyboardEvent.code (which remains constant regardless of layout), switching legends changes what you see on screen without breaking physical key identification.

Key vs Code: Physical vs Interpreted input

The browser distinguishes between two crucial properties on every keypress: event.code and event.key. The code property identifies the physical hardware position on your keyboard (such as KeyQ, Digit1, or ShiftLeft), remaining identical regardless of software language settings. The key property represents the interpreted character or command after your operating system's keyboard layout and active modifiers (such as Shift or AltGraph) are applied. This tester highlights keys based on physical code to guarantee accurate hardware diagnosis.

Testing multiple keys and keyboard ghosting

Keyboard ghosting occurs when pressing multiple keys simultaneously causes an unpressed key to register or prevents a pressed key from being detected, typically due to limitations in traditional membrane switch matrices. Gaming and mechanical keyboards often feature anti-ghosting and N-Key Rollover (NKRO) circuitry. Press and hold multi-key combinations inside our tester to observe which keys successfully reach your browser. The tool tracks the maximum simultaneous keys observed during your session to help you verify rollover performance.

Troubleshooting

• If a key does not highlight, click inside the tester to ensure its orange focus outline is active, and check whether your operating system or browser reserves that shortcut.
• If the displayed character differs from your physical key cap, compare Event Key with Physical Code in Key Details. Operating system layouts change the character without changing physical key positions.
• If numpad keys act like arrow keys, turn on Num Lock and inspect the event location. Standard numeric input requires Num Lock to be active.
• If a key appears to register twice on a single press, inspect for mechanical switch chatter. While this browser tool visualizes arrival, physical debounce issues may require switch cleaning or replacement.
• Fn, Touch ID, and hardware power buttons are managed internally by device firmware and rarely generate standard KeyboardEvents in web browsers.
• If certain multi-key combinations fail to register simultaneously, your keyboard matrix may lack full rollover (NKRO). Test combinations like W + Shift + Space to observe browser delivery.

Browser and device limitations

Browser-based keyboard testing captures KeyboardEvents passed from your operating system to the web document. It cannot electrically diagnose a broken switch contact, detect hardware-intercepted Fn or power keys, or provide laboratory-grade hardware NKRO certification beyond the events your system delivers.