Keyboard Test

Verify every key on your laptop or mechanical keyboard, detect dead keys, check for ghosting, and find your N-Key Rollover limit.

OS Limitations: The "Fn" key and system-level shortcuts (like Windows Key + L) are intercepted by your Operating System and cannot be detected by any web browser.
Current Keys
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Max KRO
0
Popular device-specific tests
Windows 11Windows 10macOSAndroidMacBookNot WorkingAll KeysAppleASUSChromebook

Comprehensive Keyboard Test Guide

This free online keyboard tester helps you check every single key on your device. Whether you are typing on a laptop, testing a newly built mechanical keyboard, or troubleshooting a spill, this tool makes it easy to spot dead keys, stuck switches, or double-typing issues.

Understanding Keyboard Ghosting

Keyboard ghosting and rollover limitations happen when certain multi-key combinations do not register correctly on some keyboards due to the internal key matrix design. Because this tester highlights pressed keys in real-time, you can hold down your most used gaming combinations (like W + A + Shift) to confirm registration.

After testing your keyboard, you can also check your mouse with Mouse Double Click Test or benchmark speed using CPS Test.

Keyboard Tester FAQ

Why is the "Fn" key not detected?

The Fn key operates at hardware level and does not emit a standard browser-detectable key event.

How do I test NKRO?

Hold multiple keys at once, the Max KRO counter will show your limit.

Why did a system shortcut open?

Some combos are intercepted by the OS before the browser.