PlanetClocksOnline Timer
Set a time, press start and get an audible alert when it is over. Presets for quick timers, from one minute to an hour.
How to use the timer
Enter hours, minutes and seconds, or tap a preset, then press Start. You can pause and resume at any time. When the time is up the page plays an alarm tone, flashes the tab title and shows a message. Reset returns to the time you entered, which is also remembered for next time.
Make sure you hear it
Browsers only allow sound after you interact with the page, which happens when you press Start. Check that your device is not muted and that the volume is up. On phones, the alarm may be delayed or silent if the screen locks or the browser is in the background, so keep the page visible for important timers.
Popular timer lengths
25 minutes is the classic Pomodoro work session, followed by a 5-minute break. Other common uses are 3–4 minutes for tea, 10 minutes for a power nap or a quick workout, and 1 minute for plank or speech practice.
Frequently asked questions
Will the timer ring if the screen is off?
On desktop it will. On many phones, browsers pause pages when the screen locks, so keep the screen on for reliable alerts.
Can I run several timers?
Open the timer in multiple tabs; each tab runs independently.
Does it work offline?
Yes. Once the page is loaded, the timer does not need an internet connection.