Online Stopwatch & Countdown Timer
A simple, full-screen stopwatch and countdown timer for workouts, presentations, classrooms, or any timed activity.
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Using the timer
The stopwatch counts up in tenths of a second and supports lap tracking. The countdown timer counts down from any minutes/seconds you set, and flashes the screen with a beep when it reaches zero. Both run entirely in your browser tab.
Will the timer keep running if I switch tabs?
Yes, the timer keeps counting in the background, but browsers may slightly throttle inactive tabs — for critical precision, keep the tab active.