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Stopwatch & Countdown Timer

A precise stopwatch with laps, and a countdown timer that actually rings — right in your browser.

00:00.00

🔒 Runs entirely in your browser — keeps counting even offline

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Time anything, accurately

The stopwatch counts in centiseconds using your browser's high-precision clock — the same API games use — so pausing and resuming never drifts. Lap timing shows both the split (+ time since last lap) and the running total, ideal for workouts, cooking stages, speedcubing or debate rounds. The countdown timer covers the other direction: set minutes and seconds (or tap a preset — 25 minutes for a Pomodoro sprint), and when it hits zero you get a triple beep and a flashing tab title, so you'll notice even from another tab.

FAQ

Will the timer keep running if I switch tabs?
Yes — the end time is computed from the system clock, so it stays accurate even when the tab is in the background, and the tab title changes when time's up.
How accurate is the stopwatch?
It uses performance.now(), your browser's monotonic high-resolution clock — accurate to well under a millisecond, displayed to the centisecond.
Why didn't I hear the alarm?
Browsers only allow sound after you've interacted with the page — clicking Start counts, so the alarm normally rings fine. Check your device isn't muted.

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