MeterSeeFree Browser DiagnosticsNo Account · Local Processing

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Private by designMedia and test results are processed in this browser. MeterSee does not upload them.

Test Every Key, Rollover, and Stuck Input

Capture key presses in a controlled surface, identify stuck keys, and see how many simultaneous inputs reach the browser.

Keyboard event bench

Click test area

Current keys0

Max simultaneous0

Recent unique keys0

Diagnostic result

Ready for a keyboard test

Click the capture area, type several individual keys, then hold a combination to check browser-visible rollover.

Operating-system shortcuts and some media/function keys can be intercepted before a web page receives them. Their absence here does not prove a hardware fault.

After the test

Distinguish a missed key from a reserved shortcut.

Web pages do not receive every operating-system key. Test ordinary letter and number keys before drawing conclusions from media or function keys.

Your resultPossible causesTroubleshooting steps

One ordinary key never appearsSwitch, mapping, or layout

Compare the same key in a text editor and inspect the active keyboard layout.

Key remains visibly pressedMissing keyup or stuck switch

Release all modifiers, refocus the test, then reconnect the keyboard.

Combination drops a keyKeyboard rollover limit

Try different key groups; matrix limits often affect only specific combinations.

Keyboard event capture

How this test works

The focused test area records keydown and keyup events delivered to this page, including combinations that reach the browser.

What this cannot establish

Reserved shortcuts, remapping, focus changes, and keyboard rollover can hide events. An absent event does not identify the switch or matrix fault. Compare ordinary keys in a text editor.

Recheck before replacing hardware

Change one variable at a time, repeat under the same conditions, and compare with the operating system or the affected application. An unavailable reading is not a pass.

Measurement methodology →