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. Arrows and numpad use a standard US cluster.
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 CareKeyboard debounce hides switch bounce so presses register once. Learn how it differs from polling rate, latency, and key repeat—and when duplicates mean a failing switch.
Keyboard Debounce Test: Free Browser Check for Double KeydownsRun a keyboard debounce test in your browser—tap one key and count rapid double keydowns. Honest limits: not firmware ms readout, not USB certification.
What Is Keyboard Debounce? Definition, Timing, and Typing ImpactWhat is keyboard debounce in simple terms? See how controllers ignore contact bounce, typical timing ranges for mechanical boards, and honest limits of online tests.