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DevBench

How to use the online stopwatch

  1. Press Start— the display counts in MM:SS.cs (minutes, seconds, centiseconds) using the browser's performance clock.
  2. Press Lap while running to record a checkpoint. Every row shows the split since the previous lap and the total elapsed time, with the fastest lap highlighted in green.
  3. Pause freezes the clock at the exact millisecond and Resume continues from there; Reset clears both the time and the lap list.

Why it stays accurate in background tabs

The display is computed from timestamps (performance.now()) rather than by counting timer ticks, so a throttled or backgrounded tab does not slow the count — when you return, the stopwatch shows the true elapsed time. That makes it trustworthy for lab timings, workout laps, and anything where interval drift would matter.

Also useful: Online Timer, Countdown Creator, and World Clock.