Keyboard Latency Test
Wait for the signal, then press any key as fast as you can. This measures your reaction plus your keyboard and browser’s response time combined.
What does this test actually measure?
Real hardware input lag, the time between a physical key press and the electrical signal reaching your computer, requires specialized equipment like a photodiode to measure precisely. This tool measures something more practical for everyday use: your combined reaction time plus your keyboard, browser, and operating system’s response time, all bundled into one number.
What’s a typical result?
| Range | What it suggests |
|---|---|
| Under 200ms | Fast reaction, low-latency setup, common among gamers |
| 200–300ms | Typical for most people and everyday keyboards |
| 300ms+ | Slower reaction time, or a browser tab under heavy load |
Human visual reaction time alone typically sits around 200 to 250 milliseconds, so most of the number you see here is your brain and eyes, not your keyboard.
Why results vary between attempts
Background browser tabs, extensions, and even your device’s power-saving mode can add a few milliseconds of variance. Run the test several times and look at your average rather than your single best score, since the best run is often a lucky anticipation rather than a true reflex.
Frequently asked questions
Can this test detect a genuinely laggy keyboard?
It can hint at it if your average stays unusually high across many attempts on the same setup, but it can’t isolate keyboard lag from your own reaction time the way dedicated hardware testers can.
Does closing other tabs help?
Yes, background tabs can compete for browser resources and add small delays to timing-sensitive tests like this one.
Is my data stored anywhere?
No, all timing happens locally in your browser and resets when you leave the page.
