Per-key light-up feedback
Press a key and its twin on the on-screen layout responds instantly. Progress is obvious at a glance — lit keys work, dark keys don't — so a 104-key full-size board gets the same thorough pass as a compact 60%.
Free · No download · No sign-up
Press a key. Watch it light up — or stay dark.
KeyProbe turns your browser into a keyboard diagnostic bench. Tap every key and get instant, per-key confirmation of exactly what registers — and what's silently dead.
How the KeyProbe keyboard tester works
Using the KeyProbe keyboard tester takes about a minute. Click the tester so it's listening, then work across your keyboard row by row — letters, numbers, punctuation, the function row, the navigation cluster and the numpad. Every keystroke lights up the matching key on the on-screen layout the instant your computer receives it, so you always know exactly what registered and what didn't.
That instant feedback matters because keyboards fail quietly. A key can feel perfectly normal under your finger while sending nothing at all — the classic dead key. Others fire twice from a single press, or stay stuck down after a spill. A visual test strips out the guesswork: instead of typing blind into a notes app and squinting at the output, you get a clean pass-or-fail confirmation for every single press.
Found a dark key? Retest it a few times with firmer presses, and try a different USB port or a fresh Bluetooth pairing to rule out the connection. If it still never lights up, you've isolated a genuine hardware fault — and you know it's time to clean the switch, reseat the keycap, or start weighing a repair against a replacement.
Why test your keys with KeyProbe
A keyboard check should be fast, honest and effortless. Here's what that looks like.
Nothing to install
KeyProbe runs entirely in your browser. No downloads, no drivers, no account — open the page and start pressing. Laptop keyboards, USB boards, Bluetooth connections, mechanical or membrane: if your device sees it, the tester sees it.
Built for real-world checks
Verifying a new mechanical board, checking a keyboard after a spill, testing a secondhand find before money changes hands, confirming a fix after cleaning — one pass through the tester gives you a definitive answer.
When a keyboard check is worth running
Most people arrive here the same way: one letter quits mid-sentence. Your W dies mid-game, the spacebar starts double-firing in an email, and you realise you have no idea how long it's been broken. That's the moment it pays to test keyboard keys online — you get an objective answer in seconds instead of hammering the same letter into a document and squinting at the result.
The tester is also the fastest way to check modifier keys, which almost never get exercised on their own. Hold Shift and tap a few letters — if each letter lights up while Shift is held, both keys registered. Repeat with Ctrl, Alt and the Windows or Command key and you've covered the combinations most shortcuts actually depend on.
It earns its keep before problems start, too. Run a full pass after cleaning a spill, after swapping keycaps, or the day a secondhand keyboard arrives in the post. And if you ever need to describe a fault to a repair shop or a seller, a tested list of exactly which keys fail is far more convincing than “some of them feel off.” One note: your operating system reserves shortcuts like Alt+Tab, so those combos may never reach the page — test those keys individually instead.
Find every dead key in under a minute
No sign-up, no software, no waiting. Open the tester, press your first key, and know in sixty seconds exactly where your keyboard stands.
Frequently asked questions
How do I test my keyboard online?
Scroll to the KeyProbe tester on this page and simply start pressing keys — the on-screen layout lights up for every keystroke that registers. Sweep each row from left to right, then check the modifiers: Shift, Ctrl, Alt and the Windows or Command key. Any key that stays dark is your suspect.
Why do some key combinations not register in the tester?
Your operating system and browser reserve certain shortcuts — Alt+Tab, Ctrl+Alt+Delete, or browser combos like Ctrl+T — so those keystrokes never reach the page. Test those keys individually instead; a key that lights up on its own is working fine.
Can I test a laptop keyboard as well as external ones?
Yes. The tester responds to any keyboard your device recognises, whether that's a laptop's built-in keys, a USB keyboard or a Bluetooth connection. If you switch between keyboards, just start pressing keys with the one you want to check.
Does the keyboard tester store the keys I press?
The test runs in your browser session as you type — there's no form to submit and no typing log to review afterwards. For the full picture of how the site handles information, read our privacy policy.