Countdown Timer - Free Online Timer & Stopwatch
Free online countdown timer. Set hours, minutes, and seconds, start the countdown, and get an alert when time is up. Works in any browser tab.
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What is Countdown Timer?
Countdown Timer is a free online tool that counts down from a set time to zero. Set hours, minutes, and seconds, then start the timer. When it reaches zero, an alert notifies you. Use it for cooking, workouts, presentations, study sessions, or any timed activity. Works entirely in your browser.
How to Use Countdown Timer
- Enter hours, minutes, and seconds
- Click Start to begin the countdown
- Pause or resume at any time
- An alert sounds when the timer reaches zero
Countdown Timer Features
- Set any duration in hours, minutes, and seconds
- Quick preset buttons (1 min, 5 min, 10 min, 25 min, 1 hr)
- Pause and resume support
- Visual alert when time is up
- Works in any browser tab, no installation needed
Countdown Timer FAQ
Will the timer work if I switch tabs?
Yes. The timer runs in JavaScript and continues counting even when the tab is in the background. The alert will fire when time is up.
Is there a maximum duration?
No. You can set any duration up to 99 hours, 59 minutes, and 59 seconds.
Does it make a sound?
The timer shows a visual alert and uses the browser's built-in alert dialog when time is up.