Device Test Hub- Home
- Keyboard Test
Keyboard Test
Press keys and the same position lights up on screen. Keys that have responded stay colored, so dead keys stand out.
Event log (newest first)
How to use
- Pick your layout (untick "Show numpad" for keyboards without one)
- Press every key once; responding keys change color
- For rollover, hold several keys and read "Simultaneous (max)"
- A key that logs twice per press or raises "Possible chatter" may have a worn switch
If it does not work
- Keys the OS or browser grabs first (Windows key, Alt+Tab, Ctrl+W) may not be testable here
- The Fn key is handled inside the keyboard and never reaches the browser
- PrintScreen may only respond on release (it still turns colored)
- On a Mac, releasing other keys may not register while ⌘ is held
- A low simultaneous count (for example, nothing beyond 3 keys) can be the keyboard's rollover limit
FAQ
Are my keystrokes logged or sent?
No. The log is only shown on this page and disappears when you close it.
How do I tell JIS from US?
JIS has a tall inverted-L Enter key plus 変換, 無変換 and ¥ keys. US ANSI has a wide Enter and a backslash key above it.
What is key chatter?
A worn switch bouncing so that one press registers twice or more. This page counts it when the same key is pressed again within 30 ms of release.
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