Key Chatter Test
Does a key type "tthe" when you meant "the"? Tap each key slowly and this test catches the ghost second press.
Type normally, or tap each key slowly 10 times
Event Log
How to Use the Key Chatter Test
Key chatter is when a worn or dirty switch sends two presses for one. This test watches every key and measures the gap between releasing it and pressing it again. Gaps shorter than the threshold are faster than a human can press, so they get flagged as chatter, with a count per key.
- Pick a threshold. 30 ms catches most chatter.
- Tap each key slowly. About once a second, 10 times each.
- Watch the list. Chattering keys appear in red.
- Fix and retest. Clean the switch and run the test again.
How to Fix Key Chatter
- Blow out the switch with compressed air.
- For mechanical keyboards, pull the keycap and press the switch many times quickly to clear dust.
- Raise the debounce time in your keyboard software if it has one.
- Replace the switch on hot-swap boards, or re-solder it.
Chatter vs Auto-Repeat
Holding a key makes your OS repeat it. That is normal and ignored here. Chatter happens with a single short tap.
Frequently Asked Questions
What threshold should I use?
30 ms is a good start. Go to 50 ms if you want to be strict.
Is it the same as the double click test?
Same idea for keys. The double click test is for mouse buttons.
Can software fix it?
Debounce settings can hide it. A new switch fixes it for good.
Does typing fast cause false alarms?
Not usually. Real typing gaps are well over 30 ms.
Related Tools
Keyboard Tester
Find dead, stuck or ghosting keys on a live full-size keyboard layout.
Keyboard Ghosting Test
Hold many keys at once to check anti-ghosting and rollover (NKRO).
Double Click Test
Catch switch chatter: every gap between clicks in milliseconds, flagged when too short.
Mouse Tester
The all-in-one mouse test: buttons, wheel, chatter and polling rate.