Keyboard Tester
Press any key on your keyboard. The corresponding key below will light up to confirm it's working correctly.
Keys Pressed
0
Current Key
-
Max Keys Held
0
CapsLock
OFF
Chatter Detected
None
Standard Layout
Extended Keys & Numpad
A Comprehensive Guide to Your Keyboard Test
Our tool is more than just a visualizer. It's a powerful diagnostic utility designed to help you pinpoint common keyboard issues, from unresponsive keys to complex hardware faults. All tests run instantly and privately in your browser.
Live Visualizer & Stats
The on-screen keyboard provides immediate visual feedback, while the counters for "Keys Pressed" and "Current Key" track your inputs.
Testing Controls
Use the "Keep Highlighted" toggle to track tested keys, and the "Clear" button to reset the board for a fresh test.
Max Keys Held (NKRO Test)
This test, known as N-Key Rollover, measures how many keys your keyboard can register simultaneously—a critical feature for gaming and fast typing.
Chatter Detected
Our algorithm detects "chatter" or "double-typing," a common hardware fault where one key press is accidentally registered multiple times by a faulty switch.
Frequently Asked Questions
This is a classic sign of "keyboard chatter," a hardware fault usually caused by a failing mechanical switch. Our "Chatter Detected" feature is specifically designed to identify this problem. If a key is flagged, it likely needs to be cleaned or replaced.
N-Key Rollover refers to a keyboard's ability to correctly register multiple simultaneous key presses. Most standard keyboards can only handle about 6 keys at once (6KRO). For intense gaming or extremely fast typing, having "Full NKRO" is crucial to ensure every command is registered. Our "Max Keys Held" stat allows you to test your keyboard's limit.
Yes, 100%. This tool runs entirely within your browser (client-side). No key presses, logs, or any other data is ever sent to our servers. Your privacy is guaranteed.
Keyboard ghosting is a hardware limitation where pressing multiple keys at once (especially in certain combinations) causes some of the pressed keys to not be registered at all. It's as if a "ghost" is preventing the key press. Our tool helps you identify this by showing you exactly which keys your computer "sees" when you press several keys together.
It's simple: just start pressing keys on your keyboard. The virtual keyboard on the screen will light up instantly to show which key is being registered. You can use this to test individual keys, check your "Max Keys Held" for N-Key Rollover, and watch for "Chatter" warnings. No installation or setup is required.
This tool can help you diagnose the problem. If you press a key and it doesn't light up on our tester, it confirms the signal isn't reaching the computer. This could be due to a hardware fault (like a broken switch or circuit), dirt/debris under the keycap, or a driver issue. For mechanical keyboards, it often means the switch needs cleaning or replacing.
Yes, absolutely. Our keyboard tester runs entirely in your web browser (like Chrome, Firefox, Safari, or Edge). It is fully compatible with any operating system, including Windows, macOS, and Linux, as well as on most laptops and external keyboards.