Clinical Switch Integrity Scan • ...
Every time you type a letter on your screen, a tiny switch inside your keyboard sends a signal to your computer. For most people, this happens so fast they don't even think about it. But if you are a writer, a student, or a gamer, you know that a keyboard that misses a letter or types the same letter twice can be very annoying! That's why we built the Keyboard Audit tool at Hardware Tester.
Our tool is designed to be the easiest and most powerful way to check if your keyboard is working perfectly. Whether you use a fancy mechanical keyboard with clicking sounds or a quiet laptop keyboard, our Keyboard Tester works with everything. It's like a scoreboard for your fingers!
Imagine trying to play a piano piece where the piano forgets a note because you pressed too many keys at once. In the world of keyboards, this is called Ghosting. Cheaper keyboards often can't handle more than 3 or 4 keys at a time. Professional keyboards have something called N-Key Rollover (NKRO), which means every single key you press will show up on the screen, no matter how many you hold down. Our tool tracks your "Max Rollover" so you can see how many keys your keyboard can handle!
Have you ever typed "hello" but it came out as "helllo"? This is called Key Chatter. It happens when the physical switch inside the keyboard is starting to fail. It sends two or three signals instead of just one. Our Hardware Tester engine looks at the sub-millisecond gaps between your key presses to help you identify if a specific key is "chattering" or double-typing.
Update: Jan 2026 (v3.2.14)
Added support for Mac Command and Option keys in Windows browsers. Optimized the latency engine to measure input speed with 0.1ms precision. New "Shortcuts Lock" prevents you from accidentally closing the page while testing.
Update: Nov 2025 (v3.1.0)
Full ANSI and ISO layout detection. The tool now automatically knows if you are using a keyboard with a big Enter key or a small one! Added a visual log to see the history of every key you press.
Visual Key Feedback
Our on-screen keyboard lights up every time you press a physical key. This helps you see if the computer is actually receiving the signal.
Latency Meter
We measure how fast your keyboard is! Faster keyboards are better for gaming. If your latency is high, it might be time for a better cable or a new keyboard.
N-Key Rollover Test
Try to press as many keys as you can with both hands! Our tool will count them and show you the limit of your hardware.
Testing your hardware shouldn't be hard. Just follow these steps:
Fun Fact: Most keyboards used in offices only let you press 6 keys at once. Gaming keyboards can usually handle 104 keys at once!
Input Audit Compliance Standard ISO-KB-2026 • Real-time Monitoring
Why are some of my keys not lighting up?
If a physical key doesn't light up on our screen, it usually means the switch is broken or the cable has a problem. If it's a laptop, some keys (like Fn) might not send a signal that browsers can see.
Can this tool fix my broken keyboard?
This tool is for diagnostics, which means it helps you find the problem. It cannot physically fix a broken switch, but it tells you exactly which key you need to clean or replace.
Does it work with wireless keyboards?
Yes! It works with Bluetooth and 2.4GHz wireless keyboards. You can even use it to check if your wireless connection is slow by looking at the latency meter.