How to use the keyboard test
1. Pick your keyboard layout. Most laptops sold in the US and UK use the US layout.
2. Press each key once. A key lights up while it is held down and turns green once it has worked. The counter shows how many keys in the layout you have tested.
3. If a key does not light up, press it again more firmly and check the tips below. If it turns orange, it sent two presses from a single tap.
4. To check symbols and accented characters, type in the text box below the keyboard.
What each color means
Gray: not tested yet. Blue: pressed right now. Green: the browser received the key press, so the key works. Orange: the key sent two presses less than 40 milliseconds apart, faster than a human finger can tap. Dashed: the key exists on your keyboard, but the browser cannot see it (like Fn).
A key does not light up: what to check
If a key does not light up, the browser received nothing. Before deciding it is broken, rule out three common situations.
Function keys: on many laptops, F1 to F12 control brightness and volume by default and only send F1 to F12 while Fn is held. Test while holding Fn, or turn on Fn Lock (usually Fn + Esc).
System shortcuts: combinations such as Windows + L, Ctrl + Alt + Del and some media keys are handled by Windows or macOS before they reach the browser. They will not show up here even when they work.
Physical fault: if a regular key, such as a letter, never lights up, the problem is most likely physical. Dirt and spilled liquid are the usual causes. On a laptop, several neighboring keys failing together often points to the ribbon cable or the keyboard membrane.
Keyboard typing double letters (key chatter)
When a key types a letter twice from one press, its internal contact is bouncing: it opens and closes more than once within a few milliseconds. The test detects this and marks the key orange.
On mechanical keyboards the cause is usually a worn or oxidized switch. On laptops, dirt under the keycap is more common, and compressed air fixes many cases. On Windows, Filter Keys (Settings > Accessibility > Keyboard) ignores very fast repeated presses and works as a temporary fix.
Stuck keys
If a key stays "pressed" in the test after you let go, a stuck key warning appears after a few seconds. A stuck key can make the computer type on its own, scroll or block shortcuts. Turn the laptop off and carefully clean around the key. If the problem continues, the key or keyboard needs replacing.
How many keys work at once (ghosting and rollover)
The "Keys at once" counter shows how many keys your keyboard can send at the same time. Press and hold several keys, for example W, A, S, D and Space. If one of them does not light up while the others are held, the keyboard is blocking it (ghosting).
Laptop keyboards commonly stop at 2 to 6 simultaneous keys in some combinations because the keys are wired in a matrix. Gaming keyboards advertise anti-ghosting or N-key rollover, which lets every key register together. It makes no difference for typing, but it can matter in games.
Keys type the wrong characters
If a key lights up correctly here but types a different character in other apps, the keyboard is physically fine and the operating system is set to the wrong layout. In the "Last key" panel, "code" shows the physical key position and "key" shows the character the system produced. On Windows, change the layout in Settings > Time & language > Language & region. On macOS, use System Settings > Keyboard > Input Sources.
Your data stays on your computer
The test runs entirely in your browser. Keys you press and text you type are not recorded or sent to any server. Closing or reloading the page clears everything.
Frequently asked questions
How do I test my laptop keyboard online?
Open this page on the laptop, pick your layout and press every key. Working keys turn green and the counter shows how many are left. Nothing needs to be installed.
Why do some keys not light up in the test?
It may be a fault, but first check that F1 to F12 do not need Fn held, that the key is not a system shortcut such as Windows + L, and remember that Fn itself is never sent to the browser. If a regular letter or number never lights up, the fault is most likely physical.
Why does my keyboard type letters twice?
The key contact is bouncing and sending two presses. The test marks that key orange. Cleaning under the key fixes many cases; if it continues, the key or switch needs replacing. On Windows, Filter Keys helps as a temporary fix.
What is keyboard ghosting?
Ghosting is when the keyboard ignores a key because other keys are already held down. Hold several keys in the test and watch the "Keys at once" counter. If a key does not light up while the others are held, that is ghosting.
Does the keyboard test work on a Mac?
Yes. The test relabels keys as Command and Option automatically. One macOS quirk: while Command is held, the system does not report other keys being released, so the test releases them all when you let go of Command.
Does the keyboard test work on a phone?
The test is made for physical keyboards. On-screen phone keyboards do not send the same information. If you connect a Bluetooth or USB keyboard to a phone or tablet, the test works.
Does the test record what I type?
No. Everything runs in your browser. Nothing you press or type is saved or sent over the internet.