Free Online Keyboard Tester
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This keyboard tester lets you check every key on your keyboard directly in your browser - no downloads, no installs. Press any key and watch an interactive on-screen keyboard diagram highlight it in real time, while a details panel shows the exact key name, key code, legacy keyCode value, and how many times you've pressed it. It's the fastest way to confirm a new keyboard works correctly out of the box, diagnose a key that feels unresponsive, or just explore what code your keyboard actually sends for unusual keys. Works with any physical or Bluetooth keyboard connected to your computer; a hardware keyboard is required since on-screen mobile keyboards don't expose reliable key codes.
Features
- Full interactive on-screen keyboard diagram
- Live highlighting of every key you press
- Shows key name, key code, and legacy keyCode
- Tracks press count per key
- Displays the most recently pressed key at a glance
- Works with any USB, PS/2, or Bluetooth keyboard
Why use this keyboard tester?
- Instant results with no page reloads or server round trips
- 100% private - everything runs locally in your browser, nothing is uploaded
- No installs required - runs directly in your browser
- Completely free with no signup, installs, or usage limits
Frequently asked questions
Does this test physical or on-screen keys?
It tests physical keyboard input via your browser's KeyboardEvent API - a hardware or Bluetooth keyboard is required, since mobile on-screen keyboards don't reliably report key codes.
Why isn't a key lighting up when I press it?
If a key doesn't register, it may indicate a hardware fault, a driver issue, or in rare cases a browser/OS keyboard shortcut intercepting that key combination.
What's the difference between key code and keyCode?
`code` is the modern, layout-independent physical key identifier (e.g. KeyA); `keyCode` is the older, now-deprecated numeric value some legacy tools still expect.
Can I test multiple keys at once?
Yes - press several keys together and each one highlights independently; for dedicated simultaneous-press testing, use the Key Rollover Tester.