Keyboard Tester

The Keyboard Tester is a free, browser-based diagnostic tool designed to verify that every single key on your keyboard is functioning correctly. Whether you have just purchased a brand-new mechanical keyboard, are troubleshooting a suspicious dead key on your laptop, or are simply running a routine hardware check, this tool provides instant visual confirmation for every keypress you make.

When you press any key on your keyboard, the tool captures the raw browser KeyboardEvent in real-time. It reads the exact key code (such as KeyA, Digit5, or ShiftLeft), the human-readable key name (a, 5, Shift), and the event type (keydown or keyup). This information is displayed both in the stats panel at the top and in a scrollable event log at the bottom, giving you complete transparency into what your browser is actually receiving from your hardware.

The centerpiece of the tool is the interactive visual keyboard layout. Every key on a standard full-size QWERTY keyboard is rendered on screen. When you press a key, it lights up in real-time with a bright orange glow. Once released, the key remains highlighted in a softer color to indicate it has been successfully tested. This makes it extremely easy to identify untested or dead keys at a glance — any key that remains dark gray after you have pressed it is potentially faulty.

A progress tracker keeps count of how many unique keys you have tested out of the total available on the layout. As you work through every key, the progress bar fills up and the percentage counter updates. Reaching 100% means you have confirmed that every key on your keyboard is registering with the browser, which is a strong indicator of a fully functional keyboard.

This tool is especially valuable in several real-world scenarios. If you are buying a used mechanical keyboard, running this test before completing the purchase can save you from inheriting dead switches. If you have recently performed a keycap swap or a switch modification on your keyboard, this test confirms that nothing was accidentally disconnected during reassembly. Laptop users experiencing intermittent key failures can use this tool to document exactly which keys are affected before taking the device for repair.

One important thing to understand is that certain special keys may not register in a web browser. The Fn key, for example, is handled entirely by your keyboard's firmware and never sends a keycode to the operating system at all. Similarly, Print Screen, some media keys, and certain function key combinations may be intercepted by your OS before they reach the browser. This is not a limitation of the tool — it is a fundamental aspect of how keyboards and operating systems communicate.

The tool works with every type of keyboard hardware. Mechanical keyboards with Cherry MX, Gateron, or Kailh switches, membrane keyboards, scissor-switch laptop keyboards, wireless Bluetooth keyboards, and even USB rubber dome keyboards all work identically. The only requirement is that the key sends a standard HID keycode that your operating system forwards to the browser.

All processing is performed entirely within your browser. No keypress data is ever transmitted to any server. Your privacy is fully protected — we do not log, store, or analyze any of your keyboard input. You can use this tool with complete confidence, even when typing sensitive credentials for testing purposes.

For a more advanced keyboard diagnostic, consider pairing this tool with our Keyboard Ghosting Test, which reveals how many keys your keyboard can register simultaneously, or our Keyboard Double Click Test, which detects faulty switches that register multiple presses from a single physical actuation.