Free tool
Keyboard Debounce & Chatter Check
Tap one key lightly in the box below. We watch for rapid double keydowns the browser receives—not firmware debounce milliseconds from inside the switch.
Collecting samples
0possible bounce events
Tap one letter key lightly about 10–15 times in the box below—release fully between taps. Do not hold (OS repeat will skew results).
Last key
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Shortest retap
—ms
Median hold
—ms
Keydowns
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Release fully between taps. Holding a key triggers OS auto-repeat and is ignored here—that is not switch chatter.
Focus here and tap one letter key lightly (same key, ~10–15 times)
Choose the layout that matches your OS keyboard. Main keys, navigation cluster (Insert/Home/arrows), and numpad labels follow the selected layout. Holding Shift previews shifted symbols on this layout.
Chatter is not ghosting
Double letters from one press are debounce or switch bounce. Keys you never pressed are rollover or ghosting—use the chord test for that.
Open rollover testConfirm keys, then benchmark
Clean bounce samples mean little if switches miss. Walk the full key map, then run a timed test when typing feels stable.
Run 1-minute typing testWhat this does and does not measure
- • Flags two keydown events on the same key within about 25 ms—what software received, not factory debounce ms.
- • Ignores held keys (auto-repeat) and modifier shortcuts so results focus on bounce-like patterns.
- • Compare wired vs Bluetooth, or another machine, before blaming technique for double characters in tests.
- • Pair with polling and latency labs when a board feels “off” but scores look fine on paper.
Debounce & chatter guides
Articles on switch bounce, double letters, OS repeat settings, and honest browser tests—written for typists who use this chatter check.
What Is Debounce on a Keyboard? Plain Language for TypistsWhat is debounce on a keyboard? Learn why switches bounce electrically, how firmware filters it, and what browser tests can show—without confusing debounce with polling or ghosting.
Keyboard Debounce: What It Does and When Typists Should CareLearn how keyboard debounce filters switch bounce, when double letters mean hardware issues, and how to test your stack with symptom checks—not mystery millisecond settings.
Keyboard Debounce Time: How Long Filters Last and What Changes FeelKeyboard debounce time in milliseconds shapes duplicate letters and missed taps—learn typical defaults, gaming sliders, profile logging, and a one-minute embed to verify feel after firmware changes.
Best Debounce Time for Keyboard Typing: Stability Over Esports Min-MaxBest debounce time for keyboard work is the shortest window without duplicate characters—verify with light-tap tests, stock defaults, and a one-minute typing embed after every change.