All tools
Keyboard chatter test
Find a key that types twice: a press within 30 ms of letting go is marked as a bounce, with each gap timed. Free, with no account or uploads.
Press each key once, steadily
A key that bounces is outlined, and each bounce is listed with its gap. Held keys repeat on purpose and never count.
Shape
ANSI (US)ISO (UK, Europe)JIS (Japan)ABNT2 (Brazil)KoreanMac
Size
FullTenkeyless75%65%60%Number pad
So far
0 of 104 keys have worked
Press every key once; held keys light up.
No key has bounced so far.
- Keys that worked
- 0
- Most held at once
- 0
- Bounced presses
- 0
- Not on this board
- None
Not pressed yet: `, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, - and 92 more.
What do you want to test?
KeyboardBest for mostKeysEvery key, rollover and keys that bounceMouseButtonsButtons, double clicks, the wheel and the rateControllerGamepadButtons, triggers, sticks and drift
Hold times
No key pressed yet.
Event log
What a web page cannot see
- Fn is handled inside the keyboard and never reaches a web page.
- Shortcuts your system keeps for itself, such as Alt+Tab, ⌘+Tab or Ctrl+Alt+Delete, never reach the page; some browser shortcuts, such as Ctrl+W, cannot be stopped.
- The most keys held at once is what your keyboard, its connection and your computer allow together: many keyboards report at most six letters at once over the simplest USB mode.
- How far a key travels, where it acts and how often the keyboard reports cannot be measured from a browser.
- On Windows, Print Screen is told only when it is let go.
- Full screen, in Chrome and Edge, lets the page catch more keys, such as Escape and Alt+Tab; hold Escape to leave it.
- On a phone, this tests a keyboard you connect: the on-screen keyboard has no keys to test.
Everything happens in your browser. Nothing you press is sent anywhere or kept.
A little help along the way
Follow these steps. Every option is explained underneath. Everything happens in your browser; nothing you press is sent anywhere.
- Choose your keyboardThe shape (ANSI, ISO, JIS, ABNT2, Korean or Mac) is guessed from your system; change it if it is wrong, and choose the size: full, tenkeyless, 75%, 65%, 60% or the number pad.
- Click the board and press your keysEach key lights while held and keeps a tick once it has worked. The site's own shortcuts step aside while you test. Press Escape twice to leave.
- Hold several at onceTo test ghosting and rollover, hold many keys together; the result keeps the most held at once.
- Read the resultIt says how many keys have worked, which are still to press, the most held at once, and any key that bounced.
Questions people ask
- What is keyboard chatter?
- A worn or dirty switch can bounce, sending two presses for one. The tester marks a press that comes within 30 ms of letting go of the same key, faster than a finger can move.
- How do I find a chattering key?
- Press each key once, steadily, with one finger. A key that bounces is outlined, and the list under the result gives each bounce with its gap in milliseconds.
- Can it fix a chattering key?
- No: it only finds one. Cleaning the switch, replacing it, or the keyboard maker's own debounce setting are the usual fixes.
This page is the Keyboard tester, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the Keyboard tester's own page.
Read the step-by-step guideKeep going
Guides
- Keyboard chatter: why a key types twice, and what helps
- How to test your keyboard online, key by key
- Keyboard ghosting test: check NKRO and 6KRO rollover
- How to test a Mac keyboard, ⌘ and Fn included
- Laptop keyboard tester: check every key online
- Mouse test: check every button, the wheel and polling rate
- Double click test: does your mouse double click by itself?
- Mouse scroll test: check a wheel that skips or jumps