About this tool
Stopwatch is a free, in-browser timer that counts elapsed time to a hundredth of a second and records lap splits. It reads the browser's high-resolution, monotonic clock, so timing is unaffected by changes to the system clock. Everything runs on your device — no uploads, no accounts, no tracking, and it works offline once the page has loaded.
Start begins counting and the display refreshes on every animation frame; the same button stops it. Stopping pauses the count and keeps the elapsed time, so pressing Start again resumes from where you left off rather than restarting. Reset clears the time and every recorded lap back to zero.
Press Lap to mark a checkpoint: each entry stores the split since the previous lap alongside the running total, which is handy for timing intervals, repeated drills, or workout sets.
Frequently asked questions
How precise is the timing?
Timing comes from the browser's high-resolution, monotonic clock and is shown as minutes, seconds and hundredths of a second (MM:SS.CS). The reading is truncated to the nearest hundredth for display.
What does a lap show?
Each lap records the split since the previous lap alongside the total elapsed time, so you can compare individual segments against the cumulative time at a glance.
Can I pause and resume?
Yes. The Start button toggles to Stop while running; stopping pauses the count and keeps the elapsed time, and pressing Start again resumes from that point. Reset returns the time and all laps to zero.
Does switching tabs lose time?
No. Elapsed time is computed from start and stop timestamps rather than counted frame by frame, so if a background tab throttles the on-screen updates, no time is lost — the display shows the correct value as soon as it refreshes.
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