# Keyboard Tester & Ghosting Check

> Test every key on your keyboard to find dead switches or ghosting issues. Highlights pressed keys visually to confirm key rollover and responsiveness.

**Category:** Utility
**Keywords:** keyboard, tester, ghosting, key rollover, NKRO, dead key, switch test, key press, mechanical keyboard, input test
**URL:** https://complete.tools/keyboard-tester-ghosting-check

## How it works

The tool listens for keyboard events directly in your browser. Each key has three visual states:

- **Untested** - The key hasn't been pressed yet
- **Pressed** - The key is currently held down
- **Tested** - The key was pressed and released successfully

For ghosting detection, hold down multiple keys at the same time. The tool tracks the highest number of simultaneous keypresses and rates your keyboard's rollover capability.

## Understanding key rollover

Key rollover refers to how many keys your keyboard can register at the same time:

- **2KRO** - Only 2 simultaneous keys (basic membrane keyboards)
- **6KRO** - Up to 6 simultaneous keys (standard USB keyboards)
- **NKRO** - Every key registers simultaneously (quality mechanical keyboards)

Ghosting occurs when pressing certain key combinations causes unintended keys to register, or when legitimate keypresses are dropped. This is common on inexpensive membrane keyboards and can affect gaming or fast typing.

## Who should use this

- **Gamers** who need reliable multi-key input during gameplay
- **Typists** experiencing missed or phantom keypresses
- **Keyboard buyers** testing a new keyboard before committing to it
- **Mechanical keyboard enthusiasts** verifying every switch works after assembly or modification
- **IT professionals** diagnosing keyboard hardware issues

## How to use

1. Click anywhere on the page to make sure the browser window has focus
2. Press each key on your keyboard one at a time to check for dead switches
3. Watch each key highlight as you press it and stay marked after release
4. Hold down multiple keys simultaneously to test rollover and detect ghosting
5. Check the stats panel for your total tested count, max simultaneous keys, and rollover rating
6. Use the Reset button to start a new test session

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*Generated from [complete.tools/keyboard-tester-ghosting-check](https://complete.tools/keyboard-tester-ghosting-check)*