Frequently Asked Questions
Find instant answers about KeyTester Pro usage, browser compatibility, privacy policy, and hardware diagnostics.
KeyTester Pro uses modern HTML5 JavaScript event listeners (
keydown and keyup) to intercept keyboard inputs. When you press a physical key on your keyboard, the browser reports the key code, which highlights the corresponding virtual key on your screen in real time.
Some special hardware keys (such as laptop
Fn modifier keys or dedicated hardware Power buttons) are intercepted at the BIOS/firmware level or operating system level and are never passed down to web browsers. This is a hardware security restriction common across all web-based keyboard testers.
Yes! KeyTester Pro automatically calls
e.preventDefault() on browser function keys like F1 (Help), F3 (Search), F5 (Refresh), and F11 (Fullscreen), allowing you to safely test function keys without unwanted browser popups.
No, absolutely not. KeyTester Pro processes keystrokes strictly inside your browser's local memory. No keystroke logs or input data are ever sent over the network or saved to any database.
Ensure Num Lock is toggled ON. Select the "Full ANSI 104-Key" layout from the dropdown menu to view the full dedicated numeric keypad grid.