Check every key on your keyboard in seconds — free, no download. Press a key and it turns green on the on-screen keyboard, so you can quickly spot keys that are dead, sticky or wrongly mapped. Works for desktop, laptop and Mac keyboards, wired or wireless.
How to test your keyboard
- Click "Start keyboard test" (or click on the keyboard picture).
- Choose your layout: Full keyboard, Laptop or Mac.
- Press every key once — each working key turns green.
- Hold several keys together to check how many can be pressed at once (anti-ghosting).
What the results mean
- Green key: the key works and sends a signal to your computer.
- Blue key: the key is being held down right now. A key that stays blue after you let go is stuck.
- Grey key: not pressed yet — or not working. Press it firmly a few times.
- "Most keys at once": how many keys your keyboard can register together. Office keyboards usually manage 2–6; gaming keyboards with N-key rollover can do 10 or more.
- Code and keyCode: technical names your browser receives. Useful when a key types the wrong character.
When to use a keyboard tester
Use it before buying a used laptop or keyboard, after spilling a drink, when a key stops typing, or when gaming keys don't respond while you hold others. It also helps to check a new mechanical keyboard or a key you just replaced.
The test only listens while the keyboard area is active, so keys like Space and the arrow keys won't scroll the page. Click outside the keyboard to stop.
Not working? Try this
- A key doesn't turn green: press it several times, then clean under it with compressed air. Test the keyboard on another computer to see if the problem is the keyboard or the computer.
- Many keys don't work: check the cable or Bluetooth connection and the battery, and try a different USB port.
- Wrong characters appear: your computer may use a different keyboard language. Check Settings → Time & language → Language (Windows) or System Settings → Keyboard (Mac).
- Fn, Windows + L, media and brightness keys don't show: these are handled by the computer itself and never reach a website. That is normal.
- Keys repeat or "chatter": a worn switch can send double presses. On mechanical keyboards the switch can often be cleaned or replaced.
Frequently asked questions
How do I check if all my keyboard keys are working?
Open this keyboard tester, click Start and press every key once. Every key that works turns green. Keys that stay grey are not sending a signal.
Can I test a laptop keyboard?
Yes. Choose the "Laptop" layout. Some laptop keys like Fn are handled by the laptop itself and cannot be detected by any website.
What is keyboard ghosting?
Ghosting is when pressing several keys at once makes some of them not register. Hold 4–6 keys together and look at "Most keys at once" to check your keyboard.
Does this work with Mac keyboards?
Yes. Choose the "Mac" layout to see Cmd, Option and Control labels.
Is anything I type saved?
No. The keys are only shown on your screen and are not stored or sent anywhere.
Guides
- Laptop Keyboard Not Working? How to Find and Fix Dead Keys
- Mouse Double-Clicking on a Single Click – How to Test and Fix It
More device tests
All device tests
- Mouse Click Test
- Mic Test
- Webcam Test
- Speaker & Headphone Test
- Internet Speed Test
- Ping & Jitter Test
- What Is My IP
- Dead Pixel Test
- Refresh Rate Test
- Double-Click Test
- Touchscreen Test
- Gamepad Tester
- Battery Info