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A keyboard tester is a tool to check if each key on your keyboard works correctly. When you press a key, it displays the key information (key, code, keyCode) and modifier key states in real-time.
Press any key on your keyboard. The key information will be displayed in real-time. Press multiple keys simultaneously to see key combinations.
The keyboard is a core input device for any computer, and a single malfunctioning key can significantly reduce work efficiency. Programmers, writers, and gamers are especially sensitive to keyboard performance. Use this tool to test a keyboard before purchasing or to diagnose the condition of your current keyboard.
N-Key Rollover (NKRO) indicates how many keys a keyboard can accurately detect simultaneously. Standard membrane keyboards typically support 3–6KRO, while high-end mechanical keyboards support full NKRO, recognizing every key pressed at the same time. High rollover support is essential for fast musical performance or complex gaming inputs.