Keyboard Tester
Press any key and see it light up on an on-screen layout, catching dead keys, stuck switches, and ghosting issues in seconds. A hardware diagnostic that requires no software installation.
How to use the Keyboard Test
- Click into the page and start pressing keys.
- Each key you press highlights on the virtual keyboard.
- Work across rows to confirm every key registers.
- Watch for keys that fail to highlight, which indicates a fault.
When the Keyboard Test is useful
- Diagnosing whether a problem is the keyboard or the software.
- Testing used keyboards before buying or selling.
- Checking new builds after cleaning or repair.
- Verifying keys survive a spill or dust cleanup.
How the Keyboard Test works
The tester listens for browser key events and marks each keycode as it arrives, so a key that lights up proves the electrical circuit, the switch, and the operating system's recognition all work together. Keys that stay dark point to a hardware fault or a mapping conflict worth investigating further. The tool runs entirely in the browser and records nothing you type.
Limits to keep in mind
Browser security hides some system-level shortcuts, and layouts vary by region, so compare against the physical keys you actually have.
Frequently asked questions
Is it safe to press keys on this page?
Yes. The page only reacts visually; it never stores or transmits what you type.
A key lights up but types nothing elsewhere. What does that mean?
The hardware works, so the issue is software-level, like a remapped key or locked input setting.
Does it detect ghosting on gaming keyboards?
Roll over and ghosting behavior becomes visible when you press many keys at once and some fail to register.
Last reviewed: October 2026.