MARMOT Keyboard Tester
Free · runs in your browserCheck key presses, releases and combinations.
Amber = held · green outline = tested. Physical US-style positions; your printed labels may differ. On a small screen, scroll the diagram sideways.
Use a physical keyboard. Phone software keyboards do not reliably report physical keys; tapping this diagram is not counted as a key press.
Input stays on this page. No key text or controller readings are saved or uploaded by this tool.
How to use the keyboard tester
- Choose Start keyboard test to focus the diagram. The status turns active.
- Press and release keys. Amber highlights show what is held now, while green outlines mark tested keys.
- Hold a few keys together to check combinations. Left and right Shift, Control, Alt and Meta have separate physical codes.
- Press Escape, use Tab, or click outside to stop reading keys. Reset clears the checked keys and counters.
What this test can tell you
The keyboard tester reads physical key codes only while its test area has focus. It does not build a text transcript or capture input elsewhere on this page. Held-key indicators clear immediately when focus leaves or the tab is hidden.
This keyboard tester is not a hardware diagnostic. Fn keys, system shortcuts and some key combinations may be consumed before the browser receives them. The same physical code can carry a different letter on another layout. Refreshing or resetting clears this visit’s results.
Questions about the keyboard tester
What does the keyboard tester record?
Only physical key codes and whether they are pressed or have been tested during this visit. It does not assemble typed text, store your input or send it anywhere. Reset or reload clears the tested keys.
Why does the diagram not match my keyboard letters?
The diagram uses a US-style physical layout. KeyboardEvent.code describes a key's position, not the character it types. Your keyboard language, layout or device may use different labels or may omit keys.
Can it detect every key or prove a keyboard is broken?
No. Operating-system shortcuts, Fn, media keys and some browser shortcuts may never reach a webpage. Missing signals or combinations can also reflect browser behavior. The tool reports what the page receives, not a hardware diagnosis.
Does it work on mobile and is it free?
It is free. Connect a physical keyboard for meaningful testing on a phone or tablet. Software keyboards do not reliably send physical key codes, so tapping the on-screen diagram is not counted as a hardware test.
More input tools
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