Online Countdown Timer

A countdown timer for anything with a time limit: cooking, an exam, a workout interval, a presentation slot or a quick break. Enter hours, minutes and seconds, press Start, and the display counts down to zero.

When time runs out, the timer beeps repeatedly and flashes the screen until you press Stop or any key. While it runs, the browser tab title shows the time left, such as 04:59, so you can see it from another tab.

How to use this tool

1. Type the hours, minutes and seconds you want, or press a preset button (1, 3, 5, 10, 15, 20, 25, 30, 45 or 60 minutes). A preset only sets the time; it does not start the clock.
2. Press Start or Space. Press it again to pause and resume.
3. Press +1 minute to add time on the fly. If the timer has already reached zero, this starts one more minute.
4. Press Stop or any key to silence the alarm, or Reset (R) to return to the time you set.

Open it already set

You can link straight to a preset. Add ?m=5 to the address for a five-minute timer, or ?t=90 for ninety seconds. Bookmark the result for the timers you use every day.

If you want a timer that begins the moment the page opens, use one of the dedicated pages such as the 5-minute timer or the 25-minute timer.

Reliable timing and sound

The remaining time comes from the system clock, so it stays right when the tab is in the background or the screen sleeps. While counting down, the page asks the browser to keep the screen on where Screen Wake Lock is supported.

The beep is generated by your browser. Browsers only allow sound after you have pressed a button or key on the page once, and a muted device will stay silent, so check your volume before you depend on the alarm.