Use this online test to check the keys on a computer or laptop keyboard. A working key lights up on the screen when pressed and remains marked after it is released.
Try pressing it again, switch the keyboard layout in the test, and repeat the check in another browser or on another device. This helps distinguish a keyboard fault from an operating-system setting or browser limitation.
The browser may not detect Fn, Touch ID, some media keys, or system keyboard shortcuts. On some laptops, the F1–F12 keys must be pressed together with Fn.