Countdown Timer: Set a Timer and Get Alerted When Time Is Up
Set a countdown for any duration and get a sound alert when it hits zero. Use it for cooking, presentations, exams, or focused work sessions.
Introduction
Whether you are giving a presentation with a 15-minute slot, timing bread in the oven, or running a timed challenge for students, you need a countdown that is visible, reliable, and easy to set. Our browser-based Countdown Timer gives you a large display with customizable hours, minutes, and seconds. Set your target time, hit start, and get an audible alert when time runs out. It keeps running in background tabs and you can set it up in under 3 seconds.
Step-by-Step Guide
Set the duration
Enter hours, minutes, and seconds using the input fields or click preset buttons for common durations like 5 minutes, 15 minutes, or 1 hour. Adjust up or down with the plus and minus buttons.
Start the countdown
Click Start and the timer begins counting down. The large display is easy to read from across a room, which makes it great for presentations or classroom use.
Get notified at zero
When the countdown reaches 00:00:00, a sound alarm plays and the display flashes. You can snooze, restart with the same duration, or set a new time.
Pro Tips & Best Practices
For presentations, set the timer to your allotted time minus 2 minutes. The alarm at the "2 minutes remaining" mark gives you time to wrap up cleanly.
Use fullscreen mode when projecting the timer in a classroom or workshop. The text fills the screen and is readable from the back of the room.
Stack multiple timers by noting your sequence and resetting between intervals. For something like a HIIT workout (45 seconds on, 15 seconds rest), the Pomodoro Timer tool might be a better fit.
Common Mistakes to Avoid
Frequently Asked Questions
Does the timer keep running in the background?
Yes. The countdown uses timestamp math rather than intervals, so it remains accurate even when the browser tab is not active. The alarm triggers at the correct time.
Can I use this as a presentation timer?
Absolutely. Open it in a separate window, drag it to your extended display, and use fullscreen mode. The audience sees a clean countdown while you present from your main screen.
What sound does the alarm make?
The default alarm is a simple chime that plays for a few seconds. It is audible without being jarring. Make sure your system volume is at a comfortable level before the countdown ends.