Free tool
Keyboard Rollover test
Hold several keys at once. See which registers, which never arrives (blocking), and which appear without pressing (ghosting)—useful for gaming chords and shortcuts, less for straight prose typing.
Keys held now
0max 0
Chord preset
Press and hold every key in WASD. Orange = not registered yet; red = unexpected key (ghost).
Built-in presets cover common gaming chords. Use + Custom to save your own (up to 5 on this device). For a full key walk, test every key. Keys outside the preset that register during a hold still appear as ghosts (red).
Active
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Missing
W · A · S · D
Ghosts
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Layout reference (teal = held, orange = missing from chord, red = ghost). Pick your OS layout in the dropdown so main keys, navigation cluster, and numpad labels match your keyboard.
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.
Every key registers?
Walk the full layout once before blaming rollover—sticky switches and spills show up there first.
Open keyboard testReady to benchmark typing?
Rollover matters for chords; timed WPM still measures prose speed on Type Faster.
Run 1-minute testHow to read results
- • Missing keys never fired keydown while you held the chord—the matrix blocked them.
- • Ghost keys registered even though they are not in the preset chord.
- • Office boards often handle 2–3 keys; gaming boards advertise NKRO over USB.
- • Wireless and laptop built-ins vary—retest wired if results look odd.
Keyboard rollover guides
Articles on ghosting, NKRO, WASD chords, laptops, and wireless dropouts—written for people who use the rollover lab on this page.
Keyboard Ghosting and Rollover: How to Test N-Key Rollover OnlineLearn ghosting vs rollover, stress-test Shift and arrow chords in your browser, and know when matrix limits mean new hardware—not skill fixes.
N-Key Rollover Explained: NKRO, 6KRO, and What Gamers and Typists Actually NeedNKRO promises every simultaneous press registers—learn how firmware, USB, and wireless stacks limit real rollover, when six-key is enough for prose
What Is Key Ghosting? When Keys You Never Pressed Still RegisterKey ghosting explained: phantom inputs from matrix limits, how ghosting differs from sticky keys, safe reproduction in the rollover lab, and when to stop blaming software.
Test WASD Chord Rollover With a Free Browser Check: Step-by-StepRun the WASD preset in the free rollover lab, read teal orange and red highlights, retest on your real connection, and know when matrix limits mean new hardware—not skill issues.