Press any key and Keys lights it up on the on-screen keyboard, showing its name and code — so you can spot a stuck, dead or mis-mapped key. Keys you've pressed keep a green outline. Click the page first so it has focus. Nothing is uploaded.

—

event.key

—

event.code

—

keyCode

0 keys tested

Keys reads standard browser keyboard events, so it sees the codes your operating system reports — a few keys (media buttons, Fn, some laptop combos) are intercepted by the OS and never reach the browser, so their not showing here doesn't mean they're broken. Nothing you type is stored or sent. Everything runs on your device.