Stopwatch & timer
A precise online stopwatch with lap times and a countdown timer with an alarm — no app to install.
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A stopwatch and timer that just works
This tool runs entirely in your browser, so it's instant and works even after you go offline. The stopwatch is accurate to hundredths of a second and records lap times; the countdown timer plays an alarm sound when it reaches zero — perfect for workouts, cooking, study sessions (try the 25-minute Pomodoro preset) and presentations.
Will the alarm sound if I switch tabs?
Yes — the timer keeps running and the alarm plays when it finishes, as long as the page stays open.
Is it accurate?
The stopwatch uses a high-resolution clock, so elapsed time stays accurate even if the display updates slightly less often in a background tab.