Keyboard Tester
Test your computer keyboard online. Check for broken or sticky keys, test N-Key Rollover (NKRO) anti-ghosting, detect key chatter, and inspect key codes.
📋 Key Event Inspector (0)
📖 Comprehensive Guide to Keyboard Testing & Troubleshooting
🕹️ What is Keyboard Ghosting & N-Key Rollover (NKRO)?
Ghosting occurs when pressing multiple keys simultaneously causes some keys not to register or an unintended key to activate. Modern mechanical and gaming keyboards feature N-Key Rollover (NKRO) or 6-Key Rollover (6KRO), allowing you to press many keys at once without blocking.
⚡ What is Key Chatter (Double Typing)?
Key chattering (or key bounce) happens when a single press of a key results in two or more characters being typed (e.g. typing 'tt' instead of 't'). This is usually caused by dirt, dust, or oxidized copper leaves inside mechanical switches.
🛠️ How to Fix Keyboard Issues
For mechanical keyboards, remove the keycap and use compressed air or a few drops of 99% isopropyl alcohol directly into the switch stem while pressing it repeatedly.
Check device manager or your keyboard manufacturer software (Razer Synapse, Corsair iCUE, Logitech G HUB) for firmware updates or debounce time adjustments.
On membrane laptop keyboards, unresponsive key clusters often indicate liquid spill damage or cracked conductive traces requiring keyboard replacement.
❓ Frequently Asked Questions
Why does pressing F1 or F5 refresh my browser during the test?
Browsers have native shortcuts bound to function keys. Make sure 'Prevent Browser Shortcuts' is enabled at the top of the tester to capture them safely.
Can this tool test Mac keyboards?
Yes! Simply switch the 'OS Style' toggle to macOS to display Command (⌘), Option (⌥), and Control (^).
Are Fn and Fn combination keys testable?
Most laptops handle the Fn key purely in hardware before reaching the operating system or browser. If your browser does not receive a key event for Fn alone, it will still capture the combined function (such as media keys).
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