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Online Timer With Alarm – From 1 Minute to 24 Hours

A simple countdown timer with an alarm. Set hours, minutes and seconds or tap a preset, then press Start. It keeps accurate time even when you switch tabs.

Quick answer

Pick a preset such as 25 minutes or 1 hour, or type your own time, and press Start. An alarm plays when the countdown reaches zero and the remaining time is shown in the browser tab.

How to use the Online Timer

  1. Type hours, minutes and seconds, or tap one of the presets.
  2. Press Start. The button changes to Pause.
  3. When the time is up an alarm plays three times and the display blinks.
  4. Press Reset to run the same time again.

Tip: leave the sound switch on and keep this tab open; your device must not be muted to hear the alarm.

Popular timers

25 minutes is the classic Pomodoro focus block, followed by a 5-minute break. 10 and 15 minutes suit classroom activities and short workouts. 30 minutes and 1 hour are common for study sessions, baking and meetings.

Is the timer accurate?

Yes. Instead of counting ticks, the timer calculates the time left from your device clock every fraction of a second. If your browser slows down background tabs, the countdown still ends at the right moment.

Works everywhere

The timer runs in any modern browser on phones, tablets and computers. Nothing is installed and it works offline once the page is open.

Related tools: Hours From Now Calculator, CPS Test and Today's Date.

Popular pages

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Frequently asked questions

How do I set a 1 hour timer?

Tap the 1 h preset (or type 1 in Hours and 0 in Minutes) and press Start.

Will the alarm sound if I switch tabs?

Yes, as long as the tab stays open and your device is not muted. The remaining time is also shown in the tab title.

Can I pause the timer?

Yes. Press Pause at any time and Resume to continue from where you stopped.

What is the longest time I can set?

Up to 99 hours, 59 minutes and 59 seconds.

Is there a 25 minute timer for the Pomodoro method?

Yes — tap the 25 min preset. Take a 5-minute break after each session and a longer one after four sessions.

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