Countdown timer

Set a duration and watch the remaining time tick down, with an optional sound when it finishes.

Up to 100 hours.

The timer runs in this browser tab. Keep the tab open — the browser may slow or pause a hidden tab.

Time remaining

Set a duration and press start.

How to use

  1. Enter hours, minutes, and seconds.
  2. Start the timer.
  3. Pause, resume, or reset as needed.

What it supports

Runs in this browser tab — keep it open, since a hidden tab may be slowed by the browser. Durations up to 100 hours. The sound uses a short synthesized chime.

Related tools