Find keys that may be stuck, held or failing to release. Monitors live keydown and keyup event streams.
Press and release keys normally. The tool will monitor whether every key is released correctly.
| KEY | EVENT | TIME | HOLD | STATUS |
|---|
Press and release individual keys normally. Verifies standard keydown -> keyup event pairs.
Intentionally hold a key for 4–6 seconds. Tests threshold warning transitions and clean release.
Hold W + A + Shift + Space, then release them sequentially. Verifies multi-key release tracking.
Test Shift, Ctrl, Alt, and Meta individually to verify that OS shortcuts do not mask keyup signals.
Monitoring is live — press any key to start checking keyup releases.
Learn how stuck keys happen, how browser keyboard events are detected and how to interpret possible stuck-key results.
A stuck key means that a key remains logically pressed in software, does not physically release correctly, or continues producing unexpected continuous input.
This tool detects browser keyboard events (keydown and keyup). It cannot directly inspect physical switch leaves, PCB traces, or firmware registers. Therefore, an unreleased key indicates that no keyup signal was delivered to the browser window—it does not prove irreversible physical switch destruction.
Ensure your finger is completely off the switch. If the key was held intentionally, release it and verify that the status returns to 'Released'.
Dust, hair, or sticky residue under keycaps can mechanically prevent switches from rebounding. Remove the keycap and inspect the stem.
Unplug the USB cable or power-cycle wireless 2.4GHz/Bluetooth connections to reset the hardware controller buffer.
Macro tools (AutoHotkey, Razer Synapse, iCUE, etc.) or virtual controllers can intercept and hold simulated keystrokes logically.
Plug the keyboard into a different USB port (preferably motherboard rear I/O) or test on another device to rule out OS-level driver conflicts.
If using a hot-swappable mechanical keyboard, replace the suspect switch with a known good switch to isolate switch leaf oxidation.
A stuck key occurs when a key remains logically active in software or physically depressed in hardware, causing continuous input or failing to fire a keyup release event.
The tool monitors the time between physical keydown and keyup events. If a key remains depressed past your chosen threshold (default 5.0 seconds), it is flagged as suspected or stuck.
The threshold is the hold duration limit after which an active key is treated as potentially unreleased. You can configure this setting between 2s and 30s.
If you intentionally hold a key down longer than the threshold, the tool flags it because it cannot tell whether the hold is intentional or mechanical. Once you release the physical key, it updates to 'Released'.
No. A browser tool only detects web events. Missing keyup events can be caused by window focus loss, operating system hotkeys, macro software, or USB disconnects rather than physical switch failure.
Yes. Keyboard remapping software, driver glitches, accessibility tools, and virtualization software can send logical keydown events without following up with proper keyup events.
No. Normal OS auto-repeat is tracked separately as repeat events. The tool recognizes continuous holds and will not falsely confuse normal repeat behavior with chatter.
Browsers stop sending key events to inactive tabs. To prevent false positives where a released key appears stuck simply because the window blurred, active tracking is safely paused.
Yes. Shift, Control, Alt, Meta (Windows/Command), and Caps Lock have dedicated real-time indicators in the Modifier Status panel.
Yes. The virtual keyboard supports standard alphanumeric, function, navigation, arrow, and modifier keys. Specialized OS media keys (e.g. Volume) may be intercepted directly by the operating system.
Yes. It works with all keyboards including mechanical, optical, membrane, magnetic hall-effect, scissor switches, and laptop keyboards.
Yes. 2.4GHz wireless and Bluetooth keyboards work identically, helping you identify wireless packet loss where keyup signals were dropped.
No. All keyboard event processing occurs strictly in client-side JavaScript. No keystrokes or diagnostic logs are ever transmitted to a server.
