Stopwatch
Start, pause, and reset a stopwatch with hundredths precision — runs entirely in your browser.
Free online stopwatch with lap timer
Press Start to begin counting from zero with hundredths-of-a-second precision. Lap records a split without stopping the clock — each lap appears in the list below the controls. Pause freezes the display; Resume continues from the same point. Reset clears the elapsed time and all recorded laps. Use Copy laps to paste the full list into a spreadsheet or document.
The stopwatch uses Date.now() as its time source, so brief tab-background throttling does not cause accumulated drift — the displayed time always reflects the real wall-clock difference between start and now.
FAQ
Does the stopwatch drift if I switch tabs? No. The elapsed time is calculated from the absolute start timestamp each tick, so any slowdown in the interval does not add error.
How do I export the lap list? Press Copy laps. Each lap is on its own line in HH:MM:SS.cs format, ready to paste into any text editor or spreadsheet.