Keyboard Tester — Check Every Key on Your Keyboard

This keyboard tester shows a full on-screen layout and highlights every key in green the moment you press it, so you can quickly confirm which keys on your physical keyboard are working and which ones aren’t responding.

Press Reset at any point to clear your progress and run through the whole board again — useful for testing after a spill, a repair, or simply confirming a brand-new keyboard works before you rely on it.

How to Use This Keyboard Tester

Just start pressing keys on your physical keyboard. Each one lights up on the on-screen layout as soon as it registers, and the counters at the top track how many unique keys you’ve tested against the total key count. If a key you pressed never lights up, that’s your answer — it isn’t registering.

What This Tool Detects

This test confirms whether each individual key sends a signal at all. It won’t measure how fast that signal arrives — for that, use our Keyboard Latency Tester — but it will immediately reveal dead keys, keys that only work when pressed hard, and keys that were never wired correctly out of the factory.

Common Keyboard Problems This Test Reveals

• Dead or unresponsive keys, often from liquid damage or a failed switch.
• Sticky keys that need to be pressed harder or longer than normal to register.
• Keys that only work intermittently, suggesting a loose connection under the keycap.
• Manufacturing defects on brand-new keyboards, before the return window closes.
• Ghosting-related gaps, where certain key combinations fail to register together — a known limitation covered in Wikipedia’s entry on rollover.

Full-Size vs Compact Keyboard Layouts

This tester maps a full-size layout, including the number pad, function row, and navigation cluster, so it works whether you’re testing a compact 60% keyboard (in which case several keys simply won’t apply to you) or a full 104-key board where every key on screen should get pressed.

When You Should Test Your Keyboard

Test immediately after unboxing new hardware, after any liquid spill even if it seems to have dried fine, after a deep clean where keycaps were removed, or any time typing feels inconsistent. It only takes a minute, and catching a dead key early is a lot less frustrating than discovering it mid-document. Once every key checks out, our Typing Speed Test is a good next stop to see how the keyboard actually performs under real typing.