Countdown Timer
Set a countdown timer with an alert sound when time runs out.
00:00:00
Set a time and press Start
Key features
Set hours, minutes, and seconds, press Start, and this page counts down with a large on-screen display — an alert sound plays and the tab title flashes when time runs out, even if this isn’t the tab you’re currently looking at.
The timer runs entirely in your browser. Nothing is recorded or sent anywhere — closing this page cancels it.
How to use
Set the time
Enter hours, minutes, and seconds, or tap a quick preset.
Press Start
The countdown begins immediately and updates every second.
Get alerted at zero
An alert sound plays and the browser tab title flashes so you notice, even in another tab.
Frequently asked questions
Will the alert work if I switch to another tab?
Yes — when the countdown ends, this page changes its browser tab title to flash a "Time's up!" message and plays a sound, both of which work even if the tab isn't focused. Just make sure your device volume is on.
Does the timer keep running if I close the tab?
No. Like any browser-based timer, it only runs while this tab stays open — closing it cancels the countdown.
Is my timer setting saved anywhere?
No. Nothing about your timer is stored or sent anywhere — it exists only in this browser tab.