Keyboard Tester
Press each key and watch it light up: find dead keys, keys that double-type, and how many keys your keyboard registers at once.
At a glance
- Every key lights up while you hold it and turns green once it has worked, so a dead key stands out at a glance.
- Drawings for full-size, tenkeyless, laptop and Mac keyboards, in ANSI (US) or ISO (UK and Europe) shape.
- Shows how many keys register at once (rollover) — press a handful together to check for ghosting.
- Flags key chatter: a key that types twice because it registers again within 30 ms of being let go — the usual sign of a worn or dirty switch.
- Lists each key event with its key, code, keyCode and location, and how long the key was held — handy for checking remapped keys and macros.
- Nothing you type is stored or sent anywhere. Works with USB, Bluetooth and laptop keyboards.
Step by step
How to test your keyboard
- 1
Pick your keyboard
Choose full size, tenkeyless, laptop or Mac, and ANSI or ISO, so the drawing matches.
- 2
Press every key
Go row by row. Each key should light up while held and stay green afterwards.
- 3
Look for gaps
A key that stays grey did not register. Press it again firmly, then check it in another program.
- 4
Test several at once
Hold down several keys together; Most keys at once shows how many the keyboard reports.
Features
Everything you need, nothing you don’t
See every key
A live drawing of your keyboard: held keys light up, tested keys stay green.
Four layouts
Full size with number pad, tenkeyless, laptop and Mac, in ANSI or ISO shape.
Rollover and ghosting
See the most keys registered at the same time.
Chatter detection
Catches keys that double-type, the classic fault of worn mechanical switches.
Event details
key, code, keyCode, location, modifiers and hold time for developers and remappers.
System keys too
In full screen, Chrome and Edge can also catch Esc and the Windows key.
What the results mean
| You see | What it means |
|---|---|
| A key stays grey | The key did not register. It may be broken, disabled, or a key the browser never sees (such as Fn). |
| A key turns amber | Possible chatter: it registered twice in a row within 30 ms. Clean or replace the switch. |
| A different key lights up | The keyboard layout in your system settings may not match the keyboard, or the key is remapped. |
| Few keys at once | Many keyboards register only 2–6 keys together; gaming keyboards usually allow many more (n-key rollover). |
Keys a browser cannot test
- Fn is handled inside the keyboard and never reaches the computer — test it by using it with another key, such as Fn + F2.
- Windows key, Print Screen and media keys may be taken by the operating system first. Use Test system keys (full screen) in Chrome or Edge.
- Shortcuts such as Ctrl + W or Ctrl + T are kept by the browser and can’t be blocked — avoid them while testing.
- On a Mac, a key let go while ⌘ is held sends no release, so the drawing lets go of all keys when ⌘ is released.
- Laptop function keys often control brightness or volume unless Fn is held (or Fn Lock is on).
Keyboard not working? Check these
- Connection: re-plug a USB keyboard or try another port; charge and re-pair a Bluetooth one.
- Num Lock: the number pad types numbers only when Num Lock is on.
- Layout: if keys type the wrong characters, check the input language or keyboard layout in your system settings.
- Filter Keys / Sticky Keys (Windows accessibility settings) can make keys slow or behave oddly.
- Dirt: crumbs under a key make it stick or double-type — turn the keyboard over and use compressed air.
FAQ
Frequently asked questions
How do I test my keyboard online?
What is key rollover and ghosting?
What is key chatter?
Why does the Fn key not light up?
Can I test a laptop or Mac keyboard?
Is what I type saved?
Keep going
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