Countdown Timer
Create countdown timers for events and deadlines
How to use this tool
- Set hours, minutes, and seconds for your timer
- Or select a target date/time for event countdowns
- Click Start to begin the countdown
- Use fullscreen mode for better visibility
About this tool
Use this countdown timer for productivity sessions, cooking, workouts, or event countdowns. The timer works offline and notifies you when complete (if you grant notification permission). Features fullscreen mode for presentations or focused work sessions.
Frequently asked questions
How do I set a countdown timer?
Enter hours, minutes and seconds for a plain duration, or pick a target date and time to count down to an event. Then press Start. Fullscreen mode makes the display readable from across a room.
Will the timer keep running if I switch tabs?
Yes. The remaining time is worked out from the clock rather than by counting ticks, so a background tab that the browser throttles still shows the correct time when you return. Leaving the tab visible is safest if you are relying on the alert.
Will I get a notification when the timer ends?
If you grant notification permission when your browser asks, yes. Without it the page still shows that the countdown has finished, but you will only see it if you are looking at the tab.
Can I use this as a presentation or exam timer?
Yes, that is what fullscreen mode is for. The large digits are legible across a room, and the background colour picker lets you choose something that suits the room or matches your slides.
What is the difference between a countdown timer and a stopwatch?
A countdown starts from a duration you set and runs down to zero, which is what you want when the time is fixed. A stopwatch starts at zero and counts up, which is what you want when the duration is what you are measuring.
Does the timer work offline?
Once the page has loaded, yes. It runs entirely in your browser with no server involved, so losing your connection does not stop it.