Last event
Recent keys
Recent clicks
Test every key on your keyboard online: each key lights up while you hold it and stays marked once it has worked, so dead, stuck or double-typing keys stand out. Switch between full-size, TKL and Mac layouts with ISO or ANSI, check rollover and ghosting, and read the key, code and keyCode of every press.
How to use
- Press keys on your keyboard. Each key lights up while held and stays marked once it has worked.
- Pick Full, TKL or Mac to match your keyboard, and turn on ISO for the extra key next to left Shift and the tall Enter.
- Hold several keys together to test rollover and ghosting: Max at once shows the most keys registered at the same time.
- Tap any row under Last event to copy key, code, keyCode, location or modifiers.
- On a phone or tablet, tap the text field and type with the on-screen keyboard.
- While the tester has focus it blocks browser actions such as Tab, Space scrolling, arrows, Backspace, F5 and the Alt menu so every key can be tested. Click outside the keyboard card to stop.
- Some shortcuts belong to the operating system or browser and never reach a web page: Ctrl+W, Ctrl+T, Ctrl+N, Alt+Tab, Alt+F4, the Windows key menu, Cmd+Tab, Cmd+Q and most media keys.
- The Fn key is handled inside the keyboard itself, so it cannot be detected. On Windows, Print Screen only reports when it is released.
- If a key you press is not on the drawing, it is still listed under Recent keys with its code.
- Typed letters are relabeled to your real layout (AZERTY, QWERTZ, Cyrillic…) as you press them.
Finding a faulty key
Press every key once, row by row, and look for keys that never turn on (dead), stay lit after you let go (stuck) or light up when you press a different key. A key that registers twice per press is usually a worn or dirty switch: on mechanical keyboards a short burst of compressed air or a switch replacement often fixes it, on laptops the key mechanism may need cleaning.
Keys you press that are not on the drawing still appear under Recent keys with their code, so media keys and unusual layouts can be checked too. Letters are relabeled to your real layout, such as AZERTY, QWERTZ or Cyrillic, as you type.
Rollover and ghosting
N-key rollover is the number of keys a keyboard can report at the same time. Hold several keys together and watch Max at once: many office keyboards stop at 2 or 3 keys in certain combinations, gaming keyboards often handle 6 or more. Ghosting is when a key you did not press appears, and blocking is when a pressed key is ignored; both show up when you try typical game combinations such as W + A + Shift + Space.
Frequently asked questions
How do I test my keyboard online?
Click inside the tester and press each key. It lights up while held and stays marked after it has worked, so untested and dead keys are easy to spot.
Why doesn't the Fn key show up?
Fn is handled inside the keyboard itself and never reaches the computer as a key, so no web page or program can detect it.
Why can't I test Ctrl+W or Alt+F4?
Some shortcuts belong to the browser or operating system and never reach a web page, including Ctrl+W, Ctrl+T, Alt+Tab, Alt+F4 and Cmd+Q.
What is a good rollover for gaming?
6 keys at once covers almost every game. Press your most-used combinations together and check that Max at once matches.
What is the difference between key and code?
code is the physical position, such as KeyQ, while key is the character it produces in your layout, such as q, a or й.