Countdown Timer

Count down a duration or to a target date and time, accurate in background tabs.

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How it works

Two modes: count down a fixed duration you enter in hours, minutes, and seconds, or count down to a specific future date and time. Either way the tool computes the target end timestamp once and derives the remaining time from the real system clock on each tick, so background-tab throttling cannot make it lose time. When it reaches zero the display flashes and a tone plays. Everything runs locally in your browser — no account, no server, no notifications permission required.

Common use cases

  • Timing a presentation, workout interval, or cooking step.
  • Counting down to a product launch, exam, or holiday.
  • Running a quick break timer that stays accurate while you work elsewhere.

Frequently asked questions

Is the countdown accurate if I leave the tab?

Yes. It calculates remaining time from a stored end timestamp against the real clock, so it does not drift when the browser throttles inactive tabs. The correct time shows the moment you return.

Can I count down to a specific calendar date?

Yes. Switch to target-date mode, pick a date and time, and the timer shows days, hours, minutes, and seconds remaining until that moment.

What happens when it reaches zero?

The display flashes and a short tone plays via the Web Audio API. Nothing is sent anywhere and no system notification permission is needed.