Browser Keyboard Event Latency Test

Press keys to collect KeyboardEvent timestamps and event-loop delay estimates without claiming to measure true hardware input latency.

Press keys here

Click this panel first so it has keyboard focus.

—Latest event delay ms

—Average delay ms

—Median delay ms

0Samples

This compares the browser event timestamp with the current performance clock. It can reveal browser/event-loop scheduling delay but does not measure true keyboard hardware latency, USB polling latency, or display latency.

How to use this Browser Keyboard Event Latency Test

Inspect browser-observed keyboard event scheduling delay and keydown timing samples. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.