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Keyboard Tester: Check for Broken Keys & Ghosting

Spilled coffee on your laptop? Bought a second-hand mechanical keyboard? Our Online Keyboard Tester is the ultimate tool to verify that every single key on your keyboard is registering correctly. Detect broken keys, sticky switches, and test for keyboard ghosting without downloading any software.

How to test your Keyboard

1. Ensure your browser window is active and in focus.
2. Start pressing the keys on your physical keyboard one by one.
3. As you press a key, the corresponding virtual key on the screen will light up. A successful press will permanently change the key's color to indicate it works.
4. If a key does not light up or respond, it may be physically damaged or suffering from a software mapping issue.

What is Keyboard Ghosting?

Keyboard ghosting (or Key Rollover failure) happens when a keyboard fails to register multiple simultaneous key presses. This is a common issue for gamers who need to press W, A, Shift, and Space at the same time. To test for ghosting:

• Press and hold both Left Shift and Right Shift.
• While holding them, type a sentence like "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG".
• If letters are missing on the screen, your keyboard suffers from ghosting limits (e.g., 2-Key Rollover). High-end gaming keyboards usually feature NKRO (N-Key Rollover), allowing unlimited simultaneous presses.