Keyboard Tester
Press any key — the on‑screen keyboard lights up and shows detailed key info.
Key
Code
KeyCode
Click the reset button to clear highlights. Arrow keys, Space, Shift, Ctrl work. Escape doesn't clear.
How to Use Keyboard Tester
- Open the tool on the device whose keyboard you want to test; click anywhere on the page to give it focus.
- Press each key one by one. The corresponding key on the on‑screen QWERTY layout lights up and stays highlighted.
- Watch the info panel below the keyboard: it displays the Key value, Code, and KeyCode of the last pressed key.
- After testing, click Reset to clear highlights and the tested‑count. Press every key at least once to verify no key is dead.
Benefits of Keyboard Tester
- Visual QWERTY layout with highlighted keys instantly shows which keys register and which don’t — no need to type in a document.
- Shows the exact Key, Code, and KeyCode values, helpful for developers debugging keyboard events or configuring shortcuts.
- Prevents default browser actions for Space, arrows, and modifier keys so the test runs smoothly without scrolling or opening menus.
- Tested‑key counter shows how many unique keys you’ve pressed, making it easy to spot keys you missed.
Frequently Asked Questions
How can I check if my keyboard has a dead key?
Press each key while watching the on‑screen keyboard. If a key doesn’t light up or fails to register its code in the info panel, that key may be dead or stuck.
Can I test an external USB keyboard connected to my laptop?
Yes, the tool reads input from whichever keyboard you physically press. Just plug in the external keyboard and start pressing keys.
What is ghosting, and will this tool detect it?
Ghosting occurs when pressing certain key combinations results in a phantom key press. The tool’s real‑time highlighting helps you see if an extra key lights up when you press a combination.
Is Keyboard Tester free and private?
Yes — it is 100% free, needs no sign-up, and everything runs in your browser; your data never leaves your device.