Open the Keyboard Tester
Free online keyboard tester that detects MacBook, Windows and touch devices, confirms a physical keyboard is connected and shows the right layout.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Pressed Q, W, E, R, A, S, D → max keys held: 7 → your keyboard handles at least 7 simultaneous keys. The “F” key never turns green → the switch is faulty or not detected.Open the Keyboard Tester
Illustration. Open the tool for the real thing.
What is the Keyboard Tester?
A keyboard tester shows whether every key on your keyboard registers a press. Click the test area, press the keys one by one, and each key lights up on the on-screen keyboard and turns green once it has been detected — so a key that never lights up may be dead, dirty or stuck.
For every press it also shows the key value, the physical key code, the legacy keyCode, modifier keys and left/right/numpad location, plus a live log. The maximum-keys-held counter measures rollover: hold as many keys as you can and see how many your keyboard reports before it stops registering new ones, which is how you spot ghosting on gaming keyboards.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Mac, Windows, Linux, Chromebook or phone, plus keyboard language (QWERTY, AZERTY, QWERTZ).
Full-size, TKL, 75%, 60%, MacBook and MacBook with Touch Bar.
Tells physical keyboards from on-screen ones and works out how big yours is.
Green when pressed, red when held too long, rollover counter and a copyable report.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This utility | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
How do I test if my keyboard keys work?
Click the test area and press each key. Working keys turn green on the virtual keyboard.
What is key rollover or ghosting?
It is how many keys a keyboard can register at the same time. Cheap keyboards may ignore extra keys or report phantom presses (ghosting) when many are held.
Why does the Fn key not show?
The Fn key is handled by keyboard hardware and does not send a key event to the browser.
What is the difference between key and code?
key is the character produced (for example “a” or “A”); code is the physical key (KeyA), the same on every layout.
Does it record what I type?
No. Presses are shown on the page only and are never sent or stored.
More free tools
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Try the Keyboard Tester now
Detects MacBook, Windows or phone, shows the right layout and tests every key. Free to use.
Try it free