Online Keyboard Test
Press any key — it lights up instantly. Test all keys, combos, and multi-key rollover right in your browser.
Keyboard Test
Test keys, typing speed, and rollover
How to use
How to Check Your Keyboard
Click the test area
Click anywhere inside the keyboard tester box to focus it. Your browser needs focus on the tool to capture keystrokes.
Press every key
Press each key one by one. Working keys light up on the visual layout. Any key that doesn't highlight is either stuck or unresponsive.
Test modifier keys
Press Shift, Ctrl, Alt, and the Windows/Command key individually. These are the most common keys to fail silently.
Test multi-key rollover
Hold 5 or more keys at once. If all of them light up simultaneously, your keyboard supports N-key rollover (NKRO).
Check the key history
The key history panel logs every keystroke. Use it to spot duplicate inputs — a sign of a stuck key or chattering switch.
Test function keys
Press F1–F10 and F12. Note: F11 (fullscreen) and F5 (refresh) may be intercepted by the browser before reaching the tester.
Common Keyboard Problems & Fixes
⚠️ Key not registering at all
Cause: Debris under the keycap, a failed switch, or a damaged PCB trace on that key position.
Fix: Remove the keycap and clean under it with compressed air. For mechanical keyboards, try swapping the switch. If the issue persists on multiple keys in a row, a PCB trace may be broken.
⚠️ Key registers without being pressed (stuck key)
Cause: Liquid spill under the key, a worn-out membrane, or debris bridging the contacts.
Fix: Unplug the keyboard immediately. Flip it upside-down and gently shake out debris. Clean with isopropyl alcohol and let it dry completely for 24 hours before reconnecting.
⚠️ Key double-types (chattering)
Cause: A worn or dirty mechanical switch that triggers multiple signals per press.
Fix: Clean the switch with contact cleaner spray. For persistent chatter, replace the switch (on hot-swap boards) or use software debounce settings in your keyboard firmware.
⚠️ Modifier key (Shift/Ctrl/Alt) not working
Cause: The key is physically damaged, the driver is conflicting, or the key is remapped by software.
Fix: Test in a different application. Check your OS keyboard settings for any remapping software. On Windows, check the registry for ScanCode Map entries that may have disabled the key.
⚠️ Only some keys not working
Cause: On membrane keyboards, a torn membrane layer causes a group of keys to fail. On mechanical keyboards, a broken PCB trace affects a whole row or column.
Fix: Identify the pattern — if the failing keys form a row or column shape, it confirms a hardware trace failure. Membrane replacement is often cheaper than repair.
⚠️ Keyboard not detected by the browser
Cause: The keyboard is connected but the browser tab is not focused, or OS-level input filtering is blocking key events.
Fix: Click directly on the tester box first. Try a different browser. Disable any accessibility or macro software that may intercept keystrokes before they reach the browser.
Why You Should Test Your Keyboard Regularly
Most people only notice a keyboard problem when it becomes severe — a key stops working entirely during an important document or a stuck key spams characters in a chat. Regular testing catches problems early, before they interrupt your work or gaming.
For gamers, undetected key issues can mean missed inputs in critical moments. A stuck Shift key might cause uppercase characters to appear unexpectedly. A partially failing W key could cause intermittent movement stops in first-person games. These issues are invisible until you specifically look for them.
For typists and developers, a chattering key that types a character twice can be nearly invisible in fast typing — you may not notice the extra character until spellcheck or a compiler catches it. Testing your keyboard after any liquid spill, drop, or cleaning session is essential before trusting it for important work.
Testing takes under 2 minutes and requires no software. Simply press every key once, verify each one lights up, and you have confirmed your keyboard is fully functional.
Types of Keyboards & What to Test
⌨️ Membrane Keyboards
The most common type. Use a rubber dome layer that registers key presses when compressed. Test all keys systematically — if an entire section fails, the membrane layer is likely torn. Common in office keyboards and laptops.
🔧 Mechanical Keyboards
Use individual switches per key rated for 50–100 million keystrokes. More reliable than membrane, but switches can chatter when worn. Test for double-inputs and listen for inconsistent switch sounds, which indicate a failing switch.
💻 Laptop Keyboards
Scissor-switch or butterfly mechanism. Thin keycaps are prone to debris buildup. Test function keys (Fn combos) as well as standard keys. Some laptop keys require Fn to be held for certain inputs.
📡 Wireless Keyboards
Test with the receiver plugged in and fully charged. Intermittent key failures on wireless keyboards are often a battery issue rather than hardware failure. Replace batteries before assuming a key is broken.
🎮 Gaming Keyboards
Test N-key rollover by pressing 6+ keys simultaneously. Verify that anti-ghosting is working — all pressed keys should register without phantom inputs. Check macro keys and media keys as well as the standard layout.
🤲 Ergonomic Keyboards
Split and curved designs may have non-standard key positions. Test thumb cluster keys, tenting buttons, and any programmable keys. Ergonomic keyboards often have firmware layers — test all layers if applicable.
Keyboard Switch Types Explained
If you own a mechanical keyboard, understanding your switch type helps you diagnose problems faster. Each switch type has different failure patterns and maintenance needs.
Linear Switches (Red, Black, Yellow)
Smooth keystroke with no tactile bump. Popular for gaming. Prone to accidental keypresses due to low actuation force. If keys are firing without being pressed, linear switches on a dirty board are the usual suspect.
Tactile Switches (Brown, Clear)
A small bump at the actuation point provides feedback. Popular for typing. The tactile bump can wear down over millions of keystrokes, making the key feel linear. Run a typing test if your tactile switches feel unusually smooth.
Clicky Switches (Blue, Green)
Audible click plus tactile bump. The loudest switch type. The click mechanism can fail independently of the key registration — you may hear a click but the key doesn't register, or register without clicking.
Optical Switches
Use light beam interruption instead of physical contact. Theoretically immune to chattering since there is no metal contact to wear out. If an optical switch fails, it is usually a dust blockage on the sensor rather than contact wear.
Hall Effect Switches
Use magnets to detect key position. Extremely durable and allow adjustable actuation points. Rarely fail but can drift if the magnet weakens. If a Hall Effect key requires more force over time, magnetic strength may be declining.
What to Check When Buying a Used Keyboard
If you are buying a second-hand mechanical keyboard, always run a full key test before completing the purchase. Used keyboards can have dead switches, worn keycaps, or liquid damage that is not visible from the outside. Here is what to check:
- ✓Press every single key and verify it registers — do not skip any.
- ✓Hold 6+ keys simultaneously to verify N-key rollover is working.
- ✓Listen for switches that sound different from others — inconsistent sound indicates a replaced or failing switch.
- ✓Check for keycap shine (worn legends) — heavy use wears out keycap legends over time.
- ✓Test the USB cable for intermittent disconnections by gently wiggling it.
- ✓Check for any sticky keys by pressing and releasing each key quickly.
- ✓Test the spacebar — it receives the most keystrokes and is the first to show switch wear.
Frequently Asked Questions
Does this store my keystrokes?▼
No. Everything runs locally in your browser. Nothing is sent to any server. We cannot see or record what you type.
Why doesn't F11 light up?▼
F11 triggers browser fullscreen and is consumed by the browser before reaching our listener. F5 (refresh) may behave similarly. These are browser-reserved keys.
Can I test a Bluetooth keyboard?▼
Yes — any keyboard your OS recognizes (USB, PS/2, or Bluetooth) will work with the tester. The browser receives all keyboard events regardless of connection type.
How do I check N-key rollover?▼
Hold 5 or more keys simultaneously. If all of them light up at the same time, your keyboard supports NKRO (N-Key Rollover). Gaming keyboards typically support NKRO, while office keyboards often limit to 6-key rollover.
My key types the wrong character — is it broken?▼
Not necessarily. This is usually a keyboard layout mismatch between your OS language setting and your physical keyboard. Go to your OS input settings and check the active layout.
Can I test a laptop keyboard?▼
Yes. Laptop keyboards work exactly the same way. Note that some laptop function keys require pressing the Fn key first, and some Fn key shortcuts are handled by firmware before reaching the browser.
How do I fix a water-damaged keyboard?▼
Disconnect immediately, flip upside-down to drain liquid, do NOT press keys. Let it dry completely for 24–48 hours. Clean with 90%+ isopropyl alcohol once dry. Many keyboards survive if power is removed quickly enough.
What is the difference between membrane and mechanical keyboards?▼
Membrane keyboards use a rubber dome layer and are quiet but have less tactile feedback. Mechanical keyboards use individual switches per key — they are more reliable, last longer (50–100 million keystrokes), and are preferred by typists and gamers.
How do I clean a sticky keyboard key?▼
Remove the keycap using a keycap puller or a flat tool. Clean the switch stem and housing with a cotton swab dipped in isopropyl alcohol. Let it dry completely before replacing the keycap. For membrane keyboards, clean the rubber dome and membrane contact points beneath the key.
My keyboard types on its own — what is wrong?▼
A stuck key is the most likely cause — check the key history panel for any key showing constant input. Other causes include a macro script running in the background, remote access software with stuck key inputs, or a short circuit from liquid damage.
Why are some keys not showing in the tester?▼
Some special keys like the power button, brightness keys, and some media keys are handled by the OS or firmware before reaching the browser and will not appear in the tester. This is normal behaviour and does not indicate a hardware problem.
How often should I test my keyboard?▼
Test after any liquid exposure, after dropping the keyboard, after extended periods of heavy use, or any time you notice a key feeling different. A quick full-key test takes less than 2 minutes and can catch problems before they escalate.