Stopwatch

Precise stopwatch with millisecond accuracy and lap timer. Built-in countdown timer tab. Works even when the tab is in the background.

1. Click Start to begin the stopwatch.
2. Click Lap to record a split time while the stopwatch is running.
3. Click Stop to pause, then Start again to resume.
4. Switch to the Countdown tab to set a timer in hours, minutes, and seconds.

Whether timing workouts, cooking, presentations, or experiments, a reliable stopwatch with lap support is a daily tool. This one works accurately even when you switch browser tabs, using clock-difference timing.