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Test your keyboard for key responsiveness, input latency, and ghosting.
Press any key to begin hardware check...
Response Delay
0.00ms
Active Signals
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Pro Tip: Input latency includes your OS scheduling and browser event loop. For gaming, aim for consistent values below 10ms.
Ghosting Check: Press 3+ keys simultaneously to verify N-Key Rollover support.
The Keyboard Response utility is a high-performance diagnostic suite for gamers, mechanical keyboard enthusiasts, and developers. It measures key-down and key-up event timings directly inside the browser event queue, providing a highly accurate latency index and probing hardware-level rollover (anti-ghosting) limits.
Keyboard ghosting is a hardware limitation where certain keys fail to register when multiple keys are pressed simultaneously. This occurs because of simplified electrical grid wiring under the keys, where columns and rows overlap.
High-end gaming and mechanical keyboards feature **N-Key Rollover (NKRO)** or **Multi-Key Rollover (MKRO)**, which physically isolates every key so that no matter how many keys are held down, they all register perfectly.
Use our **anti-ghosting test** area below to hold down combinations like WASD + Space + Shift to verify if your hardware is dropping key signals during intense gaming sessions.
Every keyboard signal travels from the switch, through the internal controller, over the USB bus (subject to USB polling rates), and into the OS kernel before reaching the browser.
Our **keyboard latency tester** measures the time difference between consecutive events and key-state updates. While browser-based testing is subject to local thread rendering latency, it serves as a highly precise relative benchmark to compare different switches, wired vs. wireless connections, or bluetooth delays under identical environments.
We use standard browser `code` identifiers (Physical positions) because they are more reliable for hardware testing than `key` values, which change based on your OS language settings and Shift/Alt modifications.
This specific tool is optimized for HID Keyboard reports. For mouse testing including polling rate and button clicks, please use our dedicated Mouse & Sensor Tester tool.
Yes. All processing happens locally on your computer via Javascript. No keystrokes are logged, stored, or transmitted to any server. You can even use this tool offline after the page loads.
For professional gaming, a total system-level latency under 5ms is ideal. Most high-performance wired mechanical keyboards poll at 1000Hz (1ms interval), while standard office keyboards or Bluetooth controllers can have 15ms to 30ms of lag.
This is a classic symptom of 2-Key Rollover (2KRO) found in inexpensive office keyboards. The internal membrane grid cannot distinguish overlapping column/row signals. Upgrading to an NKRO mechanical keyboard will resolve this.