Keyboard Ghosting Test

How to use the Keyboard Ghosting Test

1. Hold several keys down at the same time
2. Watch the Held at once counter
3. Keys that stay grey while others are held are ghosting

About this tool

Check how many keys your keyboard can register at the same time. Find ghosting and key-rollover limits on gaming and office keyboards. Keyboard Ghosting Test is part of WebToolNest's collection of free web & device. It works instantly in your browser with no account and no installation.

What is keyboard ghosting?

Most keyboards don't wire every key separately. They use a grid, and when you hold certain combinations the keyboard can't tell which keys are down — so it drops some presses. That is ghosting (sometimes called blocking or jamming). In games it means a jump or reload that never happens while you are running diagonally.

How to test it

1. Hold the keys you use together in games — for example W + A + Shift, then add Space.
2. Every held key should turn blue and the Held at once counter should rise with each one.
3. If a key stays grey while the others are held, that combination ghosts. Try other combinations — rollover limits depend on which keys share the grid.

What the numbers mean

• 2–3 keys: typical for basic office keyboards. Fine for typing, limiting for games.
• 6 keys: “6-key rollover”, the limit of standard USB keyboards — enough for nearly every game.
• More than 6: “N-key rollover” (NKRO) — every key is read independently. Some keyboards only enable NKRO in their software or with a key combination.

Note: some laptops and browsers cap the count themselves, and macOS reports keys differently while command is held, so test with letters, Shift and Space for the clearest result.

Frequently asked questions