Keyboard Tester
Detects MacBook, Windows or phone, shows the right layout and tests every key · free, no signup
Free Online Keyboard Tester — Check Every Key and Rollover
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.
Key features
Detects your setup
Mac, Windows, Linux, Chromebook or phone, plus keyboard language (QWERTY, AZERTY, QWERTZ).
Six layouts
Full-size, TKL, 75%, 60%, MacBook and MacBook with Touch Bar.
Keyboard connected check
Tells physical keyboards from on-screen ones and works out how big yours is.
Rollover, stuck and dead keys
Green when pressed, red when held too long, rollover counter and a copyable report.
How to use it
- Look at the “Your keyboard” panel — it shows your system, and the layout is chosen for you (change it if it is wrong).
- Press every key; each turns green when detected.
- Hold several keys together to measure rollover.
- Note any key that never lights up, then use Reset to test again.
Worked example
Example
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.
Who uses this tool
Buyers of new or used keyboards
Check every key before the return window ends.
Gamers
Verify rollover and anti-ghosting for gaming.
Developers
Look up event.key, event.code and keyCode values.
Tips for the best results
- Test on a bare desktop, not through a KVM switch or remote session, which can drop keys.
- Test laptop keyboards with the charger connected to avoid power-saving quirks.
- Blow out dust or use a keycap puller if a key sticks.
- Some keys (Fn, Windows/Command) cannot be detected by any web page.
Common mistakes to avoid
- Assuming a key is dead when the operating system captures it (for example volume keys).
- Pressing keys outside the test area where they do nothing.
- Testing with sticky-keys or filter-keys turned on.
Why use AZRS QuickFix?
It is 100% free, needs no signup and has no watermark or usage limits. The tool runs in your browser, so what you type stays on your device, and it works on phones, tablets and desktops. New tools are added every week — bookmark this page or browse the full QuickFix toolbox.
Frequently asked questions
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.
Can it tell if I have a MacBook or a Touch Bar?
It detects that you are on a Mac and guesses the model from your screen size. Websites cannot detect a Touch Bar, because it is a touchscreen strip with no browser API, so you choose “MacBook with Touch Bar” yourself if you have one.
Can it tell that a keyboard is connected?
Browsers cannot list connected keyboards. The page shows “Physical keyboard detected” after your first real key press, and warns you if the events look like an on-screen keyboard or if you are on a touch-only device.
Does it work on a phone?
It is designed for physical keyboards, but Bluetooth keyboards work with tablets and phones.