Hardware Inspect

Keyboard Rollover Test

See how many simultaneous key inputs this browser detects while you hold keys.

Keyboard Rollover Test controls

Listening for simultaneous keys

Hold several keys at the same time. Space and page-navigation keys are captured for the test; press Esc to release normal page scrolling.

Keys held now0
Maximum detected together0
Last detected key—

Scroll the keyboard horizontally for more keys.

This is the largest simultaneous key set the browser observed during this session, not a hardware certification.

Try:W + A + S + D + Shift + SpaceQ + W + E + A + S + D

Keyboard Rollover Test is listening.

How to test keyboard rollover

  1. Hold several non-reserved keys at the same time.
  2. Compare the physical keys you are holding with the highlighted browser-detected keys.
  3. Watch Maximum detected together as you try different combinations.

What the result means

Maximum detected together is the largest simultaneous set of browser key events observed during this session. It is not an NKRO or hardware certification because operating-system and browser shortcuts can intercept some combinations before the page receives them.

Why some combinations may differ

Keyboard matrix design, firmware, operating-system shortcuts, browser behavior, and remapping can all affect which codes reach a web page. Use the guided Keyboard Ghosting Test when you want to compare one known expected combination against what the browser receives together.