Countdown Timer
A simple online countdown timer with an alarm sound. Set hours, minutes and seconds.
05:00
🔒 Runs in your browser. Nothing you enter is uploaded or stored.
How to use it
Set the time and press Start. You can pause and resume, or reset to the set time. When it reaches zero a short beep plays and the browser tab title changes so you notice even in another tab.
The timer keeps accurate time by checking the clock rather than counting ticks, so it stays correct if your device is busy. Some phones pause web pages when the screen locks, so keep the page open for important timings.
FAQ
Why did I not hear the alarm?
Check your volume and silent switch. Browsers only allow sound after you have tapped the page, which pressing Start does.