Countdown Timer
Count down from a set duration or to a target date — with a beep when time's up.
About Countdown Timer
Countdown Timer counts down from a chosen duration or to a target date and time, with an alarm when it reaches zero. Set hours, minutes, and seconds for a quick task timer (workout intervals, cooking, focused 25-minute blocks), or pick a specific date and time for a launch countdown (a product release, a webinar, New Year's Eve). The remaining time updates live, and at zero the page sounds a beep and — with your permission — sends a desktop notification.
Worked example: set a 15-minute timer for a Pomodoro-style work block, and the display shows 14:59 → 14:58 → … → 00:00, with a beep at the end. Or set a target of 2026-12-31 23:59:59 in your time zone for a New Year countdown — the timer shows days, hours, minutes, and seconds remaining, updating every second. The page title also reflects the remaining time, so you can monitor it from another tab.
Two notes on accuracy. The countdown is timestamp-based rather than a ticking counter: the target time is fixed when you start, and each tick recomputes the remaining time from the current wall clock. That is what keeps the timer accurate even when your browser throttles background tabs (Chrome, Firefox, and Safari all slow setInterval in inactive tabs to save battery). If you set a target in another time zone, the countdown still runs against the absolute moment, so a 'midnight UTC' target stays correct regardless of where you are. The audio alarm needs the browser to allow audio playback (most do once you have interacted with the page); desktop notifications need a one-time permission grant.
All countdown logic runs in your browser. Nothing about your timers is uploaded or logged.