Online Countdown Timer with Alarm
Set a countdown in hours, minutes and seconds with an alarm sound. Works in the background and full screen.
Loading Countdown Timer…
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How to use Countdown Timer
- 1
Open Countdown Timer on this page. It loads right in your browser.
- 2
Add your file, text or values and adjust the settings.
- 3
Copy the result or download it. Nothing is uploaded or stored.
About this tool
Pick a preset (1, 5, 10, 30 minutes…) or type any hours, minutes and seconds, then press Start (or the space bar). An alarm plays when time is up, even if the tab is in the background.
Use full screen for classrooms, presentations and workouts. Need to count up instead? Switch to the stopwatch; for focused work sessions try the Pomodoro timer.
Features
- Any time up to 99 hours, or one-tap presets
- Alarm sound and optional notification
- Accurate in background tabs
- Full-screen mode for classrooms
- Time shown in the browser tab
Frequently asked questions
Does the timer keep running if I switch tabs?
Yes. Time is calculated from the clock, so it stays accurate, and the alarm still plays.
Can I get a notification?
Allow notifications when you start the timer and you'll get one when time is up.
Can I use it full screen?
Yes, click the full-screen icon at the top of the timer.