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Key Tester - Test Any Individual Key

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Keyboard Tester

Test your physical keyboard by pressing keys and viewing live key name, code, value, and press counts.

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Run a complete keyboard diagnostic that tracks which keys have been tested across your entire keyboard.

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Keyboard Visualizer

Watch a clean, minimal on-screen keyboard light up in real time as you type or press keys.

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Sometimes you just need to check one key - what it's called, what code it sends, and whether it registers at all. This key tester is a focused version of the full keyboard diagnostic: press any single key and see its details appear immediately, without needing to work through the entire keyboard. It's useful for identifying an unfamiliar key on a new or unusual keyboard layout, confirming a remapped key is sending the code you expect, or quickly checking one suspect key without the visual noise of a full diagnostic grid.

Features

  • ✓Press any single key to see its full details instantly
  • ✓Shows key name, key code, and legacy keyCode
  • ✓Full keyboard diagram for context on where the key sits
  • ✓No setup or multi-key sequence required

Why use this key tester?

  • Instant results with no page reloads or server round trips
  • 100% private - everything runs locally in your browser, nothing is uploaded
  • Focused on one key at a time for quick spot-checks
  • Completely free with no signup, installs, or usage limits

Frequently asked questions

How do I check what a specific key sends?

Just press it - the tool immediately shows the key's name, code, and legacy keyCode value in the details panel.

Can I use this to check remapped keys?

Yes - if you've remapped a key with software, pressing it here shows exactly what code your OS/browser now receives.

Why does an unusual key show an unfamiliar code?

Some keyboards (especially compact or non-US layouts) send codes that differ from a standard full-size layout - this tool shows the raw code so you can identify it precisely.