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Keyboard Tester

Press every key and watch it light up. Which keys work, and how many can you hold at once?

Type
Speed
Takes
about 1 min
Result in
keys tested

Keyboard Tester

~1 min

  1. Press every key on your keyboard. Each lights up while it is down and stays marked once tested.
  2. Hold several keys together to see how many your keyboard can send at once.
  3. Press Finish when you are done. A few keys never reach a web page; the article lists them.

For a physical keyboard. Esc twice quickly also finishes.

Your result: — keys

How it's measured

Try another challenge

  • Double Click Test

    Check whether your mouse turns one click into two.~30 sec

  • Typing Speed

    Type common words for 30 seconds, 1 or 2 minutes.~1-2 min

  • Spacebar Counter

    Press Space as fast as you can for 5 to 60 seconds.~15 sec

  • Number Typing

    Type numbers and press Enter, 10-key style.~1-5 min

  • Alphabet Typing

    Type A to Z as fast as you can.~10 sec

  • Scroll Speed

    Spin your mouse wheel as fast as you can.~15 sec

How does the keyboard tester work?

Press the keys on your keyboard one by one. Each key on the drawing lights up while it is down and stays marked once it has been tested, so the keys still white are the ones you haven't pressed, or that never reached the page. The drawing is a full-size US keyboard of 104 keys; on a phone or a small tablet only the main block is drawn. Press Finish, or Esc twice quickly, to see the result.

Keys are named by where they sit, not by what they type, so the drawing matches a keyboard set to any language. The line under the drawing shows the last key's name and position as your browser reports them.

What does the Keyboard Tester show?

  • Keys tested: how many of the 104 drawn keys sent a press. Keys the drawing doesn't have, such as media keys or the extra key some European keyboards have beside left Shift, are listed by name.
  • Most held at once: the most keys the page saw down at the same moment, your keyboard's rollover as far as a browser can see it.
  • Keys that chattered: a key that sent a second press less than 60 ms after the first, without being held long enough to repeat. A finger can't press one key twice that fast; a worn or dirty switch can, and it shows as doubled letters when you type.

What is key rollover, and what is ghosting?

Rollover is how many keys a keyboard can report at the same time. Keyboards that use the basic USB report send at most six ordinary keys plus the modifiers at once; others have no such limit, which is called n-key rollover. Ghosting is a different fault: on some cheap keyboards, pressing certain keys together makes another key appear that you never pressed, or stops one from registering. If holding three or four keys here lights a key you aren't pressing, or one stays dark, that is the cause.

Which keys can't a web page test?

  • Fn. It changes what other keys send inside the keyboard, and never reaches the computer as a key of its own.
  • System shortcuts. The operating system takes some combinations first: switching windows, the lock screen, Ctrl + Alt + Delete. The browser keeps a few too, such as closing the tab, so don't press those during the test.
  • Print Screen sends only its key-up on Windows; the page counts that as tested.
  • Media and brightness keys are often handled by the computer or the keyboard itself.

For your mouse, the Double Click Test finds a button that clicks twice; for typing speed, the Typing Speed Test.

Questions

Why doesn't a key light up?
Either the key didn't send anything, which points at the key or its switch, or something took the press before the page: the operating system, the browser, or the keyboard itself (Fn). Try the key in a text box to tell which.
How do I test for ghosting?
Hold several keys together, starting with pairs and adding one at a time. If a key you aren't pressing lights up, or one you are pressing stays dark, the keyboard has a ghosting or rollover limit.
Can I test a keyboard on a phone or tablet?
Only a physical keyboard connected to it. The on-screen keyboard of a phone doesn't report keys by position, so it can't be tested this way.
Does it work with keyboards in other languages?
Yes. Keys are matched by position, so a French or German keyboard lights the right places, though the labels on the drawing are the US ones.
Is anything I type saved?
No. Your key presses are shown in your browser, and no record of them is kept.