About the Keyboard Tester
This Keyboard Tester shows a full-size keyboard with the function row, number row, letters, modifiers, arrows, navigation keys and number pad. Click the panel, then press keys: each key you press lights up and stays lit, so you can see which ones work and which ones you have not tried. Keys you are holding right now are outlined. The tool also shows the key name, the physical key code and whether it is the left, right or number pad version, and it keeps a log of your last ten presses. A counter shows how many of the 104 keys you have tested. Your browser decides what it can see: the Fn key, some media keys and keys reserved by the system are invisible to web pages. Nothing you press is stored or sent.
Updated October 2026
How to use the Keyboard Tester
- 1Click the panel that says Click here, then press keys.
- 2Press each key on your keyboard. Working keys light up and stay lit.
- 3Check the last key panel for the key name and code, and the counter for progress.
- 4Press Escape twice to leave the tester, or press Reset to start again.
Testing every key
Click the panel first. The border turns solid and the heading changes to Listening, which tells you the page is receiving keys. While it listens, the browser does not act on most keys. Space does not scroll the page, Tab does not move focus and the arrow keys do not move anything, so you can press them safely.
Work through the keyboard in rows. Any key that does not light up when you press it is worth pressing again more firmly, and then checking for dirt, damage or a driver problem. The counter tells you when you have covered all 104 keys of a full-size board.
Keys a browser cannot see
A web page only gets the keys the browser passes on. The Fn key and many special keys are consumed by the keyboard or the system first. Some shortcuts such as Ctrl with W or Alt with Tab belong to the browser or system, so the tester leaves combinations with Ctrl, Alt or Cmd alone, and leaves F5, F11 and F12 alone so you are never trapped.
On some systems, Print Screen and the Windows or Command key are also taken before the page sees them. If a key does not light up here but works in other programs, that is why.
Ghosting and rollover
Every keyboard can register only so many keys pressed at once. Cheap membrane boards may miss some combinations, while gaming keyboards often report every key at once, which is called n-key rollover. To test yours, hold down several keys, such as W, A and Space, then add more, and see which ones light up. The tool shows what your browser receives, not the electrical cause. If a key sticks or misses, finish with a speed check in the Typing Speed Test to see whether it slows you down. The Online Stopwatch times a repeat press, the Regex Tester helps when you log key codes, and the Unix Timestamp Converter reads event times from your logs.
Fixing a stuck or dead key
- Turn the keyboard upside down and gently shake out crumbs and dust.
- Use compressed air around the key, and remove the keycap carefully on a mechanical board.
- Try the key in another program and on another computer to tell a hardware fault from a software one.
- Check that the language layout and any remapping software are not changing the key.
- If a whole row is dead, try another USB port or reconnect the board.
Features
- Full-size 104-key US layout with number pad
- Pressed keys stay lit; held keys are outlined
- Key name, code and left, right or number pad location
- Log of the last ten key presses
- Progress counter and bar
- Page keys such as Tab, Space and arrows do not scroll or move focus while testing
- Nothing you type is stored or sent
Frequently asked questions
How do I test if all my keyboard keys work?
Click the panel to give it focus, then press every key one at a time. Each working key lights up and stays lit, so any key that stays grey either does not work or has not been pressed. The counter shows how many keys you have tested.
Why isn't my Fn key detected?
On most laptops the Fn key is handled by the keyboard hardware or the operating system and never reaches the browser. So a web page cannot see it, and the same goes for many media, brightness and volume keys. That does not mean the key is broken.
What is keyboard ghosting?
Ghosting is when a keyboard fails to register a key while several others are held, or reports a key that was not pressed. It depends on the keyboard's wiring. Hold several keys together and watch which ones light up. This tool shows what arrives but cannot tell you the cause.
Why does a key show a different letter than I typed?
The picture is a standard US layout, and keys are identified by their position, not by the letter printed on them. On another layout, such as AZERTY or QWERTZ, the key in the A position lights up under the name KeyA even when it types Q. The last key panel shows both.
Can I test a laptop keyboard?
Yes, for the keys the browser can see. Laptop keyboards often lack a number pad and have no separate Print Screen key or Insert key, so those keys on the picture stay grey. That is expected and does not mean a fault.
Will the tester capture my typing?
The page listens to key presses only while the panel has focus, and it does so on your device. Nothing is stored or sent, and the log is cleared when you press Reset or reload the page. Do not type passwords while any tester is active.