Press any key to see if it registers, try multi-key combos, and check polling rate without installing anything.
Press keys to highlight them in real-time. Supports multiple layouts, language keycaps, combo history, sound toggle, and reset.
Keys tested for current layout
Each mode helps you catch a different kind of keyboard problem.
Press each key and watch it light up on the layout. If one key never responds, you are likely dealing with a dead switch, debris under the cap, or a connection issue.
Hold several keys at once to see whether they all register together. This is the quickest way to spot rollover limits and the combos your keyboard struggles with.
Tap the same key a few times and watch for extra inputs. If one press turns into two, the switch may be worn or the debounce setting may be too aggressive.
This gives you an estimate of how often the keyboard reports to your computer. It will not fix latency by itself, but it can show whether your board is running slower than expected.
This page lets you check how your keyboard behaves in a browser. You can confirm that each key registers, try common problem combos like WASD + Shift + Space, look for double inputs, and get a rough polling rate reading while you type. It is useful when you are checking a used keyboard, troubleshooting a flaky switch, or testing a board after cleaning. ANSI, ISO, and TKL layouts are supported.
A polling rate test shows how often the keyboard sends updates to the computer, measured in Hz. A higher number usually means less input delay, though the difference is not always obvious outside fast games. This browser test gives you a quick estimate and can help you notice a low report rate, a bad USB port, or a settings issue.
The page listens for standard browser keyboard events like keydown and keyup. When you press a key, the matching key on the virtual layout lights up and the tester records the code, modifiers, and recent combo. Everything runs locally in the browser. Your key presses are not sent to our server.
This test catches most keyboard problems that show up in a browser, but it is not perfect. Some keys never reach the page because the operating system or browser grabs them first. Media keys and vendor-specific buttons may not show correctly, and rollover behavior still depends on the keyboard hardware. If you need to test system-level shortcuts, native software is more reliable.
A healthy key should light up right away and clear as soon as you release it. Slow response, missed presses, or a stuck highlight usually points to a switch problem, dirt, or a browser quirk.
If a combo drops one of the keys or shows something you did not press, you have found a rollover or ghosting limit. That is common on cheaper keyboards and worth checking against the shortcuts or games you use most.
Shift, Ctrl, Alt, and Cmd or Win should all register cleanly with other keys. If only modifier combos fail, check layout settings, remapping software, and driver conflicts before blaming the hardware.
A quick check is useful in more situations than most people expect.
Test the combos you actually use in game, especially movement keys with Shift, Ctrl, or Space. If one key drops out, you have found the problem before it costs you a match.
Before you buy a second-hand board, run through every key once. It takes a minute and can save you from bringing home a keyboard with dead keys or double typing.
After a spill or deep clean, keys can feel fine and still misfire. A full pass through the tester is an easy way to catch sticky, slow, or inconsistent switches.
If letters are missing, repeating, or showing up at the wrong time, use the key, chatter, and combo tests together. You will usually narrow the issue down pretty fast.
These are the problems people usually find first, and what to try next.
Usually this means dirt under the keycap, a worn switch, or a loose connection. Pull the cap, clean the area with compressed air, and test again. If the board is hot swap, replacing the switch is the next thing to try.
Double inputs usually come from aging switch contacts or debounce settings that are too short. If your keyboard software allows it, increase debounce time first. If that does not help, clean or replace the switch.
Ghosting usually comes from the keyboard matrix itself, which is common on cheaper membrane boards. Check which combos fail most often. If those combos matter to you, you may need a keyboard with better rollover support.
A few terms show up a lot in keyboard discussions. Here is what they mean.
Common questions about key testing and layouts.
A little maintenance goes a long way, especially if you use the board every day.
Dust and crumbs build up faster than people think. Pull the caps now and then, brush the plate, and clear loose debris before it starts affecting switches.
Spills are still the fastest way to ruin a good board. If it happens, unplug it right away, turn it upside down, and give it enough time to dry before you test anything.
If you hate your keyboard, the switch type may be part of the reason. Linear switches feel smooth, tactile switches add a bump, and clicky switches are loud on purpose. Pick what matches how you actually use the board.
Some boards get real fixes through firmware updates, especially for debounce or polling problems. If your keyboard has companion software, check for updates before assuming the hardware is bad.
More free tools to check your setup.
Test keyboard anti-ghosting and N-key rollover (NKRO) by pressing multiple keys simultaneously and seeing which register.
Measure your typing speed in words per minute (WPM) and accuracy. Choose 30s or 60s mode with color-coded word feedback.
Test left/right clicks and scroll wheel directions with instant visual feedback and scoring.
Measure browser-level click-to-frame latency using requestAnimationFrame. See average, best, and worst lag across 10 clicks.
Measure mouse polling rate (browser event Hz) with distribution, median, peak, and stability checks.
Methodology: This tool uses standard KeyboardEvent browser APIs that are supported in modern desktop browsers. It is meant for quick, repeatable checks rather than deep hardware diagnostics.
About: HardwareTest builds simple browser-based hardware tools that run locally on your device. This keyboard test does not need an account or software install.
Disclaimer: Results depend on what your browser and operating system allow the page to see. Some system keys may be blocked, and a second browser can be useful if a result looks questionable.
Tips for layouts, switches, and troubleshooting.
Check if your gaming keyboard truly runs at 1000Hz, 500Hz, or 125Hz with our free online polling rate tester and real-time Peak Hz dashboard.
Just bought a Logitech G Pro X keyboard? Skip installing G Hub - use our Keyboard Polling Rate Test to confirm your 1000Hz performance in seconds.
Single clicks turning into double clicks? Use our free Mouse Test counter to spot switch bounce and decide if you should repair or replace.
Keyboard feels laggy? Use our Keyboard Test to check responsiveness and learn whether 1000Hz vs 8000Hz actually matters.
Mechanical vs membrane keyboards: see which is right for you and test your current board with our free Keyboard Test.
Deep clean your mechanical keyboard safely, then verify every key with our free Keyboard Test checklist.