Stopwatch

How to use it

1. Press Start; the big display counts up with milliseconds.
2. Press the same button to pause, and again to resume from where you stopped.
3. While running, press Lap to record the current lap; the list shows each lap duration.
4. With two or more laps, the fastest and slowest laps are labeled automatically.
5. Reset clears the time and the lap list; Copy puts the lap list on your clipboard.

Common use cases

• Workouts and intervals: timing laps around a track or between exercises.
• Cooking: watching multiple stages without writing times down.
• Meetings and talks: pacing a rehearsal and spotting long sections.
• Games and puzzles: friendly competition with an honest record.

Why it stays private

The stopwatch uses your browser clock and nothing else: no network, no history, no storage: resetting really erases everything. One honest note: browser timers are not hard-real-time; the millisecond digits are computed from the system clock, so expect a few milliseconds of display jitter rather than laboratory precision.

FAQ

Q: How accurate are the milliseconds? A: The display is derived from the system clock (Date.now), so totals are trustworthy to a few milliseconds, but the browser update loop adds small display jitter. For certified timing, use dedicated hardware.

Q: What do the fastest and slowest labels mean? A: With at least two laps recorded, each lap's duration (from the previous lap to this one) is compared; the shortest lap is marked fastest and the longest slowest.

Q: Does pausing count as a lap? A: No. Pause simply freezes the running total. Lap times are only recorded when you press Lap while the stopwatch is running.