Keyboard Tester
Online keyboard tester that highlights each key the moment you press it, so you can quickly check that every key on the keyboard responds. No software to install.
FreeOnline Tool
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How to Use
- Open the tool and a full keyboard diagram appears on the page.
- Press any key and the matching position on the diagram lights up straight away.
- Work through every key you want to check and confirm each one responds.
- Keys you have already pressed are marked in a different color, so it is easy to track your progress.
- Click Reset to clear all highlighting and start the test over.
Features
- Keys highlight the instant they are pressed, giving you a live view of how the keyboard responds.
- Covers the whole keyboard, including function keys, the number pad, and the arrow keys.
- Tested and untested keys are colored differently, so the state is obvious at a glance.
- Shows both the key name and the key code (keyCode / key value).
- No drivers or plugins to install, just open it and start typing.
Use Cases
Checking a brand-new keyboard
After unboxing a new keyboard, press every key in turn to confirm there are no dead or sticking keys from the factory.
Troubleshooting a faulty keyboard
When a key stops responding or fires repeatedly, use the tool to identify exactly which key is at fault and whether it needs cleaning or repair.
Verifying a gaming keyboard
Test anti-ghosting behavior by holding several keys at once and confirming that each one is registered correctly.
Inspecting a used keyboard
Before buying a secondhand mechanical keyboard, ask the seller for a video of this test so you can check every switch remotely.
FAQ
Why do some keys not respond?
Certain system-level shortcuts, such as the Windows key or Alt+Tab, are intercepted by the operating system before the browser can see them, so this is expected behavior.
Can I test key combinations?
Yes. Hold Ctrl, Shift, or Alt and press another key, and the tool highlights every key that is currently held down.
How can I tell whether a key is sticking?
Press the key and release it, then watch whether the highlight disappears immediately. If it stays lit after you let go, the key may be sticking or making poor contact.
Does it work with external and Bluetooth keyboards?
Yes. The tool captures keys through the browser's keyboard event API, which is independent of how the keyboard is connected, so USB, Bluetooth, and wireless keyboards all work.