🟢 100% Free — No Signup

Free PC Diagnostic Tools

Browser-based tools to test your keyboard, mouse, and monitor — instantly, with no downloads. Built for gamers, builders, and anyone troubleshooting their setup.

🚫 No downloads 🔒 Runs locally in your browser ⚡ Instant results 🆓 100% free, no signup
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Full 104-Key Test
Keyboard Tester
Test every key on your full-size keyboard including numpad, arrows, and function keys. Measures shortest press time and estimated scan rate live in your browser.
Latency testScan rate104-key layout
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Up to 8000Hz
Mouse Rate Test
Check your mouse's real polling rate, click latency, jitter, and movement speed. Includes a live heatmap and CPS counter, with JSON/CSV export for deeper analysis.
Polling rateJitterClick latency
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Live Hz + Grade
Monitor Refresh Rate Test
Measure your screen's real refresh rate and frame consistency with a stability grade. Includes a motion clarity test and a VRR/G-Sync simulator to see the difference.
Refresh rateFrame timingVRR simulator
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Common Problems These Tools Help You Diagnose

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Keys not registering or repeating
Stuck keys, double inputs, or dead zones on your keyboard? Test every key individually before assuming it's a hardware failure.
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Cursor feels laggy or inconsistent
Verify your mouse is actually hitting its rated polling rate — many "gaming" mice ship running below spec out of the box.
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Monitor not showing full refresh rate
A 144Hz monitor plugged in wrong (cable, port, or Windows setting) often silently runs at 60Hz. Confirm what you're actually getting.
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Buying a used or refurbished PC
Before buying secondhand hardware, run a full check on the keyboard, mouse, and display — takes under a minute per device.

Why Test Online Instead of Calling a Technician?

Most keyboard, mouse, and monitor issues aren't hardware failures — they're driver conflicts, wrong Windows settings, or a cable running below spec. Testing in-browser first means you skip the diagnostic fee and know exactly what's wrong before spending money on a repair or replacement.

Frequently Asked Questions

Is my data uploaded or stored anywhere?
No. Every test runs locally in your browser. Key presses, mouse movement, and refresh-rate measurements never leave your device or get sent to any server.
Why does my 1000Hz mouse show a lower polling rate in the test?
This is a browser limitation, not a problem with your mouse. Browsers typically throttle input event updates to conserve battery and CPU, so a 1000Hz mouse may display 60–120Hz in-browser even though the hardware is reporting correctly at full rate.
Why is my keyboard stuck at 125Hz even on a gaming keyboard?
Standard office and budget keyboards are hardware-locked to 125Hz regardless of software settings. Only keyboards explicitly marketed with 1000Hz+ polling (common in gaming keyboards) can exceed this — check your keyboard's spec sheet to confirm.
Are these tests actually accurate, or just an estimate?
Browser-based tests measure input as it reaches your operating system — through the same path any game or app would receive it. This makes them highly reliable for comparison purposes, though a browser can't bypass OS-level polling limits. For example, most browsers cap visual updates around 60–120Hz, so a 1000Hz mouse may show a lower number even when the hardware itself is working correctly.
Do I need to install anything to use these tools?
No. All three tools run entirely in your browser using native web APIs — nothing is installed, and no drivers are required.
Do these tools work on laptops and trackpads?
Yes — the keyboard and mouse testers work with built-in laptop keyboards and trackpads as well as external peripherals, on any modern browser.
Which browser gives the most accurate results?
Chromium-based browsers (Chrome, Edge) generally expose the most precise timing APIs for polling-rate and refresh-rate measurement. Firefox and Safari work fine too, but numbers can vary slightly between browsers due to differences in event throttling.
Can these tools detect a faulty or dying peripheral?
Yes, indirectly. Inconsistent jitter on the mouse test, keys that fail to register on the keyboard tester, or a refresh rate that won't hold steady on the monitor test are all signs worth investigating further — often before assuming you need a replacement.