Keyboard Tester

What the Keyboard Tester does

The Keyboard Tester checks whether your keyboard's keys are registering correctly, giving instant visual feedback on a virtual keyboard layout as you press each key.

How to use it

1. Press any key on your physical keyboard.
2. Watch the corresponding key highlight on the virtual keyboard layout.
3. Test each key you want to verify, including modifier keys.

Common uses

• Checking whether a key has stopped registering or become unreliable, a common sign of wear or debris.
• Testing a new or secondhand keyboard before relying on it for work.
• Diagnosing a stuck or double-registering key.
• Verifying full keyboard function after a spill or cleaning.
• Checking that all keys on a mechanical keyboard's custom layout are mapped correctly.

Good to know

If a key doesn't register here even after multiple presses, it points to a hardware issue with the key switch itself rather than a software problem, since this test reads raw browser keyboard events directly from each keypress.

Like mice, mechanical and membrane keyboards both rely on physical switches that wear down over years of use, and dust or liquid contamination underneath a keycap is one of the most common causes of a single key becoming unreliable while the rest of the keyboard continues working fine — a pattern this tool makes easy to confirm precisely.