Start with the keys you actually use
Check letters, modifiers, arrows, function keys, and any shortcut combo that matters for your work or game. The live card shows the current key, code, location, and held-key state immediately.
Free, privacy-first
Keyboard Tester Online
Check every key press, find ghosting or rollover problems, and test laptop or external keyboards before you troubleshoot or replace them.
Keyboard test workspace
Session summary
Results update as you use the interface above.
How to use the keyboard tester
The fastest workflow is simple on mobile: press a few common keys, switch to current-row view for suspicious keys, then open advanced diagnostics only if the first pass raises questions.
Watch coverage and the issue summary
Coverage tells you how much of the keyboard you have verified, while the issue summary calls out suspect gaps, repeated-key anomalies, and likely browser limitations.
Switch to current-row view for suspicious keys
If one key feels wrong, use current-row view on mobile so the row is larger and easier to read without losing your place.
Use advanced diagnostics only when needed
Open the benchmark, overlap matrix, and event log after the first pass. This keeps the tool fast and clean on phones while still exposing deeper diagnostics for gamers and repair work.
Quick setup examples
Load a starting mode when you want the interface preconfigured for the job you are doing instead of changing controls one by one on mobile.
Laptop repair sweep
A repair-oriented setup that emphasizes row focus and missing-key confirmation.
Best for: Checking one broken key on a laptop or office keyboard.
Open the coverage panel after loading and sweep the suspect row carefully.
Gaming combo check
A gamer-focused setup for ghosting, rollover, and rapid interval testing.
Best for: Testing WASD combos, modifiers, and fast repeatability.
After loading, start the benchmark and test your real in-game combo instead of random keys.
Keyboard tester FAQ
Does this keyboard tester store or send my keystrokes anywhere?
No. The tool runs locally in your browser and does not require a login or server-side processing. Even so, you should never type real passwords into a diagnostic tool because system shortcuts and browser behavior can differ from secure login forms.
Why does one key fail here even though the rest of the keyboard works?
A missing key can come from real hardware failure, a layout mismatch, an OS-reserved shortcut, or a browser limitation. That is why the tool shows coverage, suspect gaps, unsupported keys, and integrity warnings instead of claiming every missing event is a dead switch.
What do ghosting and rollover mean in a keyboard test?
Ghosting means some simultaneous key combinations are dropped or misread. Rollover describes how many keys can be registered at once. Higher rollover matters most for gaming, fast shortcuts, and multi-key typing patterns.
Can I test a laptop keyboard or Bluetooth keyboard on my phone?
Yes, but only if you connect a real external keyboard. Mobile software keyboards usually do not expose the same low-level events, so the browser cannot perform a full hardware-style keyboard test without a physical keyboard.
When should I suspect hardware failure instead of browser limitations?
Suspect hardware when the same key or combo fails across multiple browsers and native apps, or when the switch feels physically inconsistent. Suspect browser or OS limits when the problem appears only in one browser or affects system-level shortcut keys.