Online Countdown Timer
Set countdown timers with custom presets for cooking, studying, workouts, and more. Features browser notifications and a clean, distraction-free interface.
Runs in your browser. No data leaves your device.
Frequently Asked Questions
How does the Countdown Timer work?
When you press start, the tool records an absolute end-time via Date.now() plus the remaining time. A fast interval tick recomputes remaining = endTime - Date.now() each cycle, so the countdown is immune to tab throttling and mobile background suspension. A visibilitychange listener recalculates on tab resume. When remaining hits zero, it fires a browser Notification.
Does the timer work if I switch tabs?
Yes. The timer runs in the background and will send a browser notification when it finishes, even if you are on a different tab. Make sure you allow notification permissions when prompted.
Can I set a custom timer duration?
Yes. You can type any hours, minutes, and seconds value, or use the built-in presets for common durations like 5, 10, 15, and 25 minutes.
Is there an alarm sound when the timer ends?
Yes. The timer plays an audio alert and sends a browser notification when it reaches zero, so you will know even if you are not looking at the screen.