DeviceMetrikBrowser diagnostics

Input Tests

Browser-based keyboard, mouse, and reaction tests for key registration, rollover, chatter, clicks, scrolling, DPI estimates, and browser-observed event timing.

11 tests

Common problems and tasks

Choose the right path

Missing keys, repeated presses, click duplication, wheel reversals, unknown DPI, and uneven browser event delivery each require a different test.

Diagnose an input symptomChoose a key, click, wheel, DPI, or browser-timing symptom.Run a gaming/input checkWork through keyboard, mouse, optional controller, refresh, and FPS steps.

Input troubleshooting

Choose the right input test

Start with the symptom or measurement you want to check.

If you only need a basic registration check, start with Keyboard Tester or Mouse Test. Use the specialist tests when the symptom is more specific.

Reaction

Reaction timing includes your response plus the display, browser, and input path; it does not isolate hardware latency.

Keyboard

Mouse

Better comparisons

Run a clean input check

  1. Keep the test focused

    Follow the dedicated tool instructions and keep the relevant browser tab or window focused while generating the sample.

  2. Keep comparison conditions consistent

    When comparing timing, rate, DPI estimates, or repeated behavior, keep the same browser, device, connection mode, test mode, duration or thresholds, and relevant OS settings where applicable.

  3. Change one variable and repeat

    If a result looks suspicious, change one relevant variable — browser, USB port, cable, wireless mode, device, or setting — and repeat before concluding the hardware itself is faulty.

Browser-visible evidence can narrow a problem down, but it cannot directly inspect electrical switches, firmware, raw USB polling, or factory sensor calibration.

Other input devices

Looking for another input type?

Controller buttons and sticksUse Controller Tests for gamepad buttons, triggers, axes, mapping, and stick drift checks.Touchscreen inputUse Touch Screen Test for touch coverage, continuity, edges, corners, and multi-touch.

Keyboard and mouse diagnostics. Keyboard and mouse tests report browser-received events and browser-observed estimates. They can reveal missing, repeated, reversed, unstable, or inconsistent browser-visible behavior, but they do not directly inspect electrical switch behavior, raw USB polling, firmware, or factory sensor calibration.

Reaction timing. Reaction tests include human response plus display, browser, and input-path delay. They cannot isolate keyboard latency, mouse latency, display latency, or total system hardware latency.

Input Tests

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