A key does not register
Press every physical key and compare it with the on-screen keyboard.
Open Keyboard Tester →Mouse and Keyboard Test Tools
Start with the symptom you can see—an unresponsive key, an accidental double click, input delay or inconsistent tracking—and open the focused test that can confirm it.
Updated July 13, 2026 · No signup or installation required
25focused tests
10keyboard tools
15mouse tools
0downloads required
Choose a test by symptom
Use the shortest diagnostic path first. A focused result is more useful than opening every tool at random.
One press types twice
Measure keyboard chatter and see which key produces repeated events.
Check keyboard chatter →Key combinations fail
Check ghosting and rollover when several gaming or shortcut keys are held.
Test keyboard ghosting →Clicks or wheel fail
Verify left, middle and right clicks plus scroll-wheel movement.
Open Mouse Tester →Clicks happen twice
Look for unintended paired clicks caused by settings, debris or switch wear.
Run Double-Click Test →Pointer movement feels wrong
Separate DPI, acceleration, drift, lift-off and sensor tracking problems.
Check mouse accuracy →
Keyboard diagnostic
Keyboard Tester
Test keyboard functionality, detect ghosting, measure latency, check for stuck keys. Test your keyboard →
Keyboard diagnostic
Typing Speed Test
Measure WPM, accuracy, and typing consistency. Check typing speed →
Keyboard diagnostic
Latency Checker
Test device and input latency in your browser. Measure latency →
Keyboard diagnostic
Spacebar Speed Test
Count how many spacebar presses you can make in 5, 10, or 30 seconds. Test your spacebar →
Keyboard diagnostic
Key Repeat Rate Tester
Measure your keyboard key repeat rate (Hz) and initial delay (ms) in your browser. Test repeat rate →
Keyboard diagnostic
Typing Rhythm Fingerprint
Visualize your inter-keystroke timing patterns and get a rhythm consistency score. Analyze rhythm →
Keyboard diagnostic
Keyboard Sound Test
Hear linear, tactile and clicky switch sounds, then use your mic to test your own keyboard's switch type, frequency spectrum and loudness. Test sound →
Keyboard diagnostic
Keyboard Chatter Detector
Find keys that register twice from a single press with configurable threshold and per-key stats. Detect chatter →
Keyboard diagnostic
Keyboard Polling Rate Test
Measure browser key-repeat Hz, median interval, initial delay, jitter, and consistency across timed runs. Test polling rate →
Keyboard diagnostic
Keyboard Shortcut Identifier
Press any key combination and instantly see what it does on Windows, macOS and Linux. Try a shortcut →
Mouse diagnostic
Mouse Tester
Check mouse buttons, scroll wheel, cursor movement, and responsiveness. Test your mouse →
Mouse diagnostic
Mouse Speed Tester
Measure your click speed (CPM or CPS) with timed tests. Check click speed →
Mouse diagnostic
Mouse DPI Test
Test DPI, sensitivity, and tracking accuracy. Test DPI settings →
Mouse diagnostic
Mouse Trail
Visualize mouse movement trails and precision. View mouse trails →
Mouse diagnostic
Ghost Click Detector
Detect unintended or phantom clicks. Detect ghost clicks →
Mouse diagnostic
Mouse Polling Rate Test
Check if your gaming mouse runs at 125Hz, 500Hz, 1000Hz or higher. Test polling rate →
Mouse diagnostic
Mouse LOD Tester
Measure your gaming mouse lift-off distance to optimize sensor performance. Test LOD →
Mouse diagnostic
Mouse Accuracy Test
Aim trainer benchmark — measure hit percentage, average pixel error, and reaction time per target. Test your aim →
Mouse diagnostic
Mouse Drag Click Test
Measure drag-click CPS, peak burst rate, and total clicks with live timeline graph. Test drag clicks →
Mouse diagnostic
Right Click CPS Test
Measure right-mouse-button CPS with browser context menu suppressed. Test right CPS →
Mouse diagnostic
Mouse DPI Calculator
Measure true mouse DPI by dragging a known distance or entering pixel and inch values manually. Measure DPI →
Mouse diagnostic
eDPI Calculator
Calculate effective DPI (DPI x sensitivity) and cm/360 for CS2, Valorant, Apex and other FPS games. Calculate eDPI →
Mouse diagnostic
Mouse Drift Test
Detect idle cursor drift and sensor jitter with a 10s-3min pointer-event sampler and pass/fail verdict. Test drift →
Mouse diagnostic
Mouse Acceleration Test
Compare slow vs fast swipe pixels to catch Windows pointer acceleration or firmware-level sensor acceleration. Test acceleration →
Mouse diagnostic
Mouse Spin Test
Counts full 360° mouse rotations over 15/30/60 s with peak spins-per-second and direction indicator. Start spinning →A reliable testing order
Confirm the basic event first, reproduce the symptom, and only then measure performance.
Keyboard workflow
- Use the Keyboard Tester to confirm every key appears once.
- If a key repeats, run the keyboard chatter test.
- For missed combinations, compare ghosting with N-key rollover.
- Only after function passes, measure latency, polling and repeat rate.
Mouse workflow
- Use the Mouse Tester to verify buttons and wheel events.
- Reproduce accidental clicks with the double-click and ghost-click checks.
- For movement problems, test drift and acceleration before changing sensitivity.
- Measure DPI, polling rate, lift-off distance and accuracy after basic tracking passes.
Mouse and keyboard testing FAQ
Quick answers about choosing and interpreting the tests.
Which test should I run first for a keyboard problem?
Start with the Keyboard Tester and press every key once. If a key registers twice, use the Keyboard Double-Click Test. For missed combinations use the Keyboard Ghosting or N-Key Rollover test, and for slow response use the latency and polling-rate tests.
How can I tell whether my mouse is double-clicking?
Open the Double-Click Test or Ghost Click Detector and click normally without intentionally double-clicking. Unexpected paired events usually point to switch chatter, debris, an operating-system double-click setting, or a worn mouse switch.
Can these tools test gaming keyboards and mice?
Yes. The collection includes keyboard rollover, chatter, repeat-rate, polling-rate and latency checks plus mouse DPI, polling rate, lift-off distance, drift, acceleration, spin and accuracy tests. Browser and operating-system limits are explained inside each tool.
Do the tests install software or upload my input?
No installation or account is required. The interactive tests run in your browser. Key presses and pointer events are processed on the device unless a tool clearly states that it uses an optional external service.
Why can an online input test differ from manufacturer software?
A browser sees events after they pass through the device firmware, USB or wireless connection, operating system and browser. Manufacturer software may read lower-level device data. Browser tests are best for verifying what websites and web apps actually receive.
Can I use these tests on a phone or tablet?
Many pointer, click and typing tools work on mobile devices, but hardware-specific features such as mouse DPI, keyboard rollover or polling rate require the relevant physical device. Each tool identifies important browser or device limitations.
Need a screen, audio, webcam or utility test?
Browse the complete 96-tool directory across every supported category.
