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).
Active
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Missing
W · A · S · D
Ghosts
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Layout (teal = held, orange = missing from chord, red = ghost)
Choose the layout that matches your OS keyboard. Arrows and numpad use a standard US cluster.
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 OnlineGaming or fast typing dropping keys? Learn ghosting vs rollover, how to test multiple simultaneous presses in your browser, and when to replace the board.
N-Key Rollover Explained: NKRO, 6KRO, and What Gamers Actually NeedNKRO promises every simultaneous press registers. Learn how firmware, USB, and wireless stacks limit real-world rollover—and when office typing can ignore the spec sheet.
What Is Key Ghosting? When Keys You Never Pressed Still RegisterPhantom letters and mystery shortcuts often come from keyboard matrix limits, not malware. Learn how ghosting differs from stuck keys and how to reproduce it safely.
How to Test a WASD Chord With a Free Browser Rollover CheckWASD is the fastest sanity check for gaming rollover. Step through a free browser test, read teal/orange/red highlights, and know when to swap hardware.