Press every key to check it works. Keys turn green once they've been pressed, and light up blue while you hold them.
Blue means a key is held down right now, green means it has been pressed at least once, and grey means it hasn't been pressed yet. Hover over a green key to see how many times it was pressed.
Choose the picture that matches your keyboard: full size, tenkeyless (no number pad), laptop, 60%, split ergonomic or ortholinear (keys in a straight grid, like the Planck). Keys that switch layers inside the keyboard, like Fn, Lower and Raise, are shown with a dashed outline because no website can see them.
The Letters menu changes what's printed on the keys: QWERTY, Dvorak, Colemak, Colemak-DH, Workman, AZERTY or QWERTZ. In Chrome and Edge, Auto shows your own layout. ANSI keyboards (common in the US) have a wide Enter key; ISO keyboards (UK and Europe) have a tall Enter and an extra key next to left Shift.
Stenotype: steno machines and steno keyboards write whole words by pressing keys together as a chord. A website can only see a steno keyboard when it types like a normal keyboard, as in Plover's keyboard mode, so the steno picture uses Plover's standard QWERTY positions and shows each chord in steno order, like STKPW or KAT.
Many keyboards can only read a few keys at the same time. Press too many together and some are missed (ghosting), or a key you didn't press appears. Gamers notice it when moving diagonally while jumping, and fast typists when keys overlap during rolls like "ing".
To test it, hold down keys one at a time and watch the Held right now count. Try the combinations you actually use, like W + A + Shift + Space for games, or a whole word's worth of letters. Budget membrane keyboards often stop at 2 or 3 keys in some combinations; most gaming and mechanical keyboards handle 6 or more, and keyboards sold as "N-key rollover" read every key at once.
If a key sometimes types a letter twice ("hello" becomes "helllo"), the switch under it is probably bouncing. The tester outlines a key in amber when two presses arrive less than 30 milliseconds apart, because nobody presses the same key twice that fast on purpose. Press the suspect key slowly 20 or 30 times and see if the warning appears.
Dust and crumbs are the usual cause, so try compressed air first. On mechanical keyboards you can often swap the switch, and some keyboards' software has a "debounce" setting that ignores very fast repeats. If the keyboard is still under warranty, a chattering key is a fair reason to ask for a replacement.
A few keys never reach the browser, so they stay grey even on a working keyboard: the Fn key, some media and volume keys, and shortcuts the operating system keeps for itself (like Windows + L). Print Screen may only light up when you let go of it. On a Mac, browser shortcuts with ⌘ still work, so ⌘ + W will close the tab.
Take the typing test to see your speed, learn to type without looking with the free typing lessons, or compare your result on the typing speed chart.
Open this page and press every key on your keyboard. Each key turns green on the screen once it has been pressed, so any key that stays grey isn't being picked up. The panel under the keyboard shows the last key pressed and how many keys you've tested.
The Fn key on laptops and compact keyboards is handled inside the keyboard itself and never sent to the computer, so no website can detect it. Test it by holding Fn and pressing a key it changes, such as an F key or an arrow.
Ghosting is when a keyboard misses a key because several others are already held down. Hold a group of keys and watch the Held right now count: if it stops going up even though you're pressing more keys, you've found your keyboard's limit.
That's called key chatter. It usually comes from a worn or dirty switch that bounces and sends two presses. The tester flags a key in amber if it registers twice within 30 milliseconds, which is faster than anyone can press a key twice on purpose.
Yes. The tester recognises the physical position of each key, so it works with QWERTY, AZERTY, QWERTZ and other layouts. The picture shows a US layout, and the Last key box shows the character your own layout produces.
No. The tester runs entirely in your browser. Key presses aren't recorded, saved or sent anywhere.