Keyboard Tester
Press any key to test it. Tested keys are highlighted.
Free Online Keyboard Tester — Check Every Key Instantly
Our keyboard tester lets you check every key on your keyboard right in your browser — no downloads, no sign-ups. Whether you're diagnosing a stuck key on a laptop, verifying a mechanical keyboard after a clean, or just curious whether that rarely-used Scroll Lock key still works, this online keyboard test has you covered.
Press any key and watch it light up on the interactive 104-key layout above. Released keys stay highlighted in a distinct shade so you can track exactly which keys you've tested — and which ones are left. The key log at the top records every keystroke in sequence, making it easy to spot double-inputs or missed presses.
From the full QWERTY layout and function row (F1–F12) to the navigation cluster, arrow keys, and numeric keypad, this keyboard test online tool supports the complete Windows standard 104-key layout. It also intercepts browser-reserved shortcuts like F5 and F11 so they register in the tester without refreshing your page or toggling fullscreen.
When Should You Run a Keyboard Test?
- After buying a used or refurbished laptop — verify every key before the return window closes.
- After cleaning a mechanical keyboard — confirm no switches were dislodged or shorted.
- When a key feels mushy or unresponsive — pinpoint the exact faulty key quickly.
- Before a gaming session — check that all WASD, Shift, Ctrl, and function keys respond.
- After a software update or driver change — rule out keyboard driver issues.
- For QA or product testing — systematically verify keyboard hardware in a reproducible way.
Frequently Asked Questions
What is a keyboard tester?
A keyboard tester is a free online tool that lets you check whether every key on your keyboard is working correctly. When you press a key, it lights up on a virtual keyboard layout shown on screen — so you can instantly see which keys register and which don't.
How do I use this online keyboard test?
Simply click anywhere on the keyboard tester area and start pressing keys on your physical keyboard. Each key you press will be highlighted on the virtual keyboard. After releasing, tested keys will remain marked so you can track which keys you've already checked. Use the Reset button to start over.
Why should I test my keyboard online?
Testing your keyboard online is useful when you suspect a key is stuck or unresponsive, after cleaning your keyboard, when buying a used laptop or mechanical keyboard, or to verify that all keys are functional before a long typing or gaming session.
Can I use this keyboard tester on a laptop?
Yes. Our keyboard tester works on any laptop or desktop keyboard connected to a browser — including built-in laptop keyboards, external USB keyboards, Bluetooth keyboards, and mechanical keyboards. The online test is device-agnostic.
Does this keyboard test work on all browsers?
Our keyboard tester is compatible with all modern browsers including Chrome, Firefox, Edge, Safari, and Brave. For the best experience we recommend using a desktop or laptop browser, as mobile virtual keyboards don't fire the hardware key events our tester listens for.
Will pressing function keys (F1–F12) trigger browser actions?
We intercept all keyboard events — including F5 (refresh), F11 (fullscreen), and other function keys — so they register in the tester without triggering your browser. This lets you test every key on a standard 104-key layout safely.
How is a 'tested' key different from an 'active' key?
An 'active' key is one you are currently holding down — it highlights while pressed. A 'tested' key is one you have pressed and released at least once; it shows a darker highlight so you can track which keys you've already verified.
Can I test the numpad and media keys?
Yes. Our tester supports the full 104-key Windows layout including the numeric keypad (Numpad 0–9, Enter, +, −, ×, ÷, and decimal), navigation cluster (Insert, Delete, Home, End, Page Up, Page Down, arrow keys), and function row (Esc, F1–F12, Print Screen, Scroll Lock, Pause).
Is this keyboard tester free to use?
Completely free — no login, no download, no installation required. Just open the page and start testing your keyboard online instantly.
What does it mean if a key doesn't light up?
If you press a key and it doesn't highlight on the virtual keyboard, that key may be physically damaged, stuck, or not registering with your operating system. Try pressing it a few more times. If it still doesn't respond, the key may need cleaning or the keyboard may need repair or replacement.