Free Keyboard and Mouse Latency Checker

Input latency is the delay between pressing a key or clicking a mouse and seeing the result on screen. It is the sum of device polling delay, OS processing, application handling, GPU render, and monitor refresh. Competitive gaming targets under 20 ms end-to-end.

The tool measures the time between the keydown event and the JavaScript event loop processing it, which captures OS and browser latency but not monitor or USB polling latency. Use it for relative comparisons (keyboard A vs keyboard B on the same machine), not absolute hardware specs.

Wired gaming keyboards typically measure 1-8 ms. Wireless 2.4 GHz is usually 3-10 ms. Bluetooth can spike to 30+ ms. Office-grade keyboards often report 10-20 ms under browser timing. Use the mouse click mode separately for mouse-button consistency.

Wireless protocols add radio-link overhead. Most 2.4 GHz gaming dongles keep the extra latency under 5 ms. Bluetooth HID runs on slotted polling and can add 10-30 ms, which is why competitive players still prefer wired.

No. Hardware testers like the Nvidia LDAT or the Logitech Latency Tool measure photon-to-event timing with microsecond accuracy. This browser tool measures a subset of the chain - useful for directional comparison rather than forensic measurement.