Online Stopwatch

Click Start to begin timing, Stop to pause, and Reset to clear. The stopwatch displays hours, minutes, seconds, and milliseconds. It continues running accurately even if you switch browser tabs.

Yes. Click the Lap button while the stopwatch is running to record split times. Each lap shows the individual lap duration and the cumulative total time. Lap times are displayed in a scrollable list below the main display.

The stopwatch uses the browser's high-resolution timer (performance.now()), accurate to microseconds. Display resolution is milliseconds. For most practical purposes, it is as accurate as a physical stopwatch.

Copy all lap times to clipboard in a formatted table, or download as a CSV file for spreadsheet analysis. The export includes lap number, lap time, and cumulative time for each recorded lap.

No. Closing the tab stops the stopwatch and loses the current time. The stopwatch uses the browser's timer API which requires an active page. For long-duration timing, keep the tab open or note the start time manually.