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Sound Visualizer

Record your typing sound and visualize the waveform in real-time

Mic Off
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warning

Key Chattering Detector

Detects double-input from faulty mechanical key switches (<50ms interval)

0 detections

No chattering detected. Type normally to monitor.

Keys will light up and stay lit after you press them.

Online Keyboard Tester & Key Rollover Check

How to Test Your Keyboard

  1. Select Your Layout: Use the toggle above to switch between Windows and Mac layouts.
  2. Press Every Key: Type naturally or slide across rows. Working keys will turn Green.
  3. Check Function Keys: Don't forget F1-F12, Esc, and specialized keys like Print Screen.
  4. Reset: Click "Reset Test" to clear the history and start over.

Troubleshooting Common Issues

  • Ghosting: If multiple keys don't register when pressed simultaneously, your keyboard might lack N-Key Rollover (NKRO).
  • Chattering (Double Typing): If a single press registers twice, the switch might be dirty or failing.
  • Wrong Key? If a key registers as a different one, check your OS language settings.

🖥️ Remote Desktop Keyboard Mapping (Mac → Windows)

When connecting from a Mac to Windows PC via Google Chrome Remote Desktop, keyboard layout differences can cause issues. Here's how to fix them:

translate 1. Korean/English Toggle Mapping

Mac uses Caps Lock or Ctrl+Space for language switching, which doesn't work properly in a Windows remote session.

Solution:

  1. On Windows remote PC: Go to Settings → Time & Language → Language & Region
  2. Set keyboard layout to "Korean Keyboard (101 Key) Type 1"
  3. In Chrome Remote Desktop sidebar → Configure Keyboard Shortcuts
  4. Map your preferred Mac key to Windows Right Alt (한/영 key)

keyboard_command_key 2. Control Key & Shortcut Mapping

Mac users expect ⌘ Cmd+C/V for copy/paste, but Windows uses Ctrl+C/V.

Solution:

  1. Open Chrome Remote Desktop sidebar menu (right edge)
  2. Select "Configure Keyboard Shortcuts"
  3. Add mapping: MetaLeft (⌘ Command) → ControlLeft (Ctrl)

lightbulb Pro Tip

For more advanced key remapping, consider using PowerToys Keyboard Manager on Windows or Karabiner-Elements on Mac. Karabiner lets you create profiles that activate only during remote sessions.

What is Key Rollover?

Gamers and fast typists need reliable input.

  • 6KRO (Standard): Most office keyboards can only register 6 keys at once.
  • NKRO (N-Key Rollover): Gaming keyboards can register unlimited simultaneous presses. Try mashing both palms on the keys to test this!

security Safe & Secure

Your keystrokes are 100% private. This test runs entirely in your browser using JavaScript. No keylogging, no server uploads.