Keyboard Test & Key Rollover Checker
Test your hardware with this interactive keyboard test. Verify every key, check key rollover test limits, and detect keyboard ghosting in real time.
Keyboard Options
About This Assessment
Key rollover determines how many simultaneous key presses your keyboard can register without dropping inputs. Standard keyboards feature 6-Key Rollover (6KRO), while gaming and mechanical keyboards feature full N-Key Rollover (NKRO).
Press any key on your physical keyboard to verify its response. Test multiple keys simultaneously to gauge maximum key rollover (NKRO). Use the options panel to toggle switch sounds, layouts, and browser shortcut interception.
How Keyboards Work: Key Rollover, Ghosting & Testing Your Keys
Whether you are typing work emails or playing games, your keyboard needs to register every keypress cleanly. Here is a simple guide to testing stuck keys, ghosting, and multi-key rollover.
What is Key Ghosting and Key Rollover?
Inside a keyboard, keys are wired in a grid of rows and columns. On cheaper keyboards, pressing three keys at the same time can cause a phantom key you never touched to register—this is called ghosting.
Key Rollover tells you how many keys you can press at the same instant. Basic keyboards only allow 2 or 3 keys at once. Good keyboards allow 6 keys (6KRO), and gaming keyboards allow every single key to be pressed together (NKRO) with zero missed inputs. Now that your keys are tested, test your typing speed on our Typing Speed Test or check your clicking reflexes on our Reaction Time Test.
Score Benchmarks & Performance Levels
| Skill Level | Score Range | Speed / Pace | Accuracy | Who Fits This Level |
|---|---|---|---|---|
| Pro Gaming / NKRO | Full NKRO (100+) | 0.1 - 0.5 ms | 100% Isolated | High-end gaming keyboards where every key can be pressed at the same time. |
| Quality Mechanical | Full NKRO (100+) | 1.0 - 5.0 ms | 100% Isolated | Quality mechanical keyboards with diodes preventing all ghosting. |
| Standard Laptop / Office | 6KRO + Modifiers | 5.0 - 10.0 ms | Good Matrix | Modern laptop and slim office keyboards; great for fast typing without dropping keys. |
| Budget Keyboard | 2KRO - 3KRO | 10.0 - 20.0 ms | Basic | Cheap keyboards that can jam or miss keys when pressing several keys at once in games. |
Simple Tips to Improve Your Score
Check for Double-Typing
Press each key once to see if it types twice by mistake (called chatter). If a key chatters, cleaning under the keycap usually fixes it.
Plug Directly into Computer
Plug your keyboard directly into your computer rather than through cheap USB hubs. This avoids lag and connection drops.
Test Gaming Key Combos
Press keys you use together in games (like W + Shift + Space + R) to make sure your keyboard registers all of them without jamming.
Keep Keys Clean
Dust and crumbs under keycaps can stop keys from clicking smoothly. A quick spray of compressed air keeps keys working like new.
Recommended Next Tests
Try these related tests to challenge other cognitive and reflex skills:
Frequently Asked Questions
Clear answers about how tests work, scoring accuracy, and tips to improve.
What is keyboard ghosting and why does it happen?
Ghosting happens when pressing several keys together causes electrical current to cross paths in a basic keyboard grid, registering an extra key you never touched. Good keyboards have diodes to prevent this.
What is the difference between 6KRO and NKRO?
6KRO means you can press up to 6 regular keys at the same instant. NKRO (N-Key Rollover) means you can press literally every key on the keyboard at the exact same second without missing any.
Why do keys like F5 or F11 trigger browser actions during testing?
Keys like F5 (refresh) or F11 (fullscreen) are protected shortcuts built into your browser or operating system. Our tool captures normal keys but browser security prevents overriding system commands.
How can I fix a key that types twice or does not register?
Double-typing is usually caused by dust or oxidation in the key switch contact. Taking off the keycap and spraying compressed air or electronics contact cleaner usually solves the problem.