Countdown Timer

Set a countdown for any duration and get an alarm when time runs out.

05:00

HoursMinutesSeconds

Formula & methodology

Will the alarm sound if the tab is in the background?

Usually yes, but some browsers throttle background tabs — keep the tab visible for reliable timing.

All processing happens locally in your browser. Your data is never uploaded.

Focus in 25-minute sprints with short breaks — a customizable Pomodoro timer.

See the current time in major cities around the world at a glance.