Browser tool
Countdown Timer
Keep track of time for a lesson, break or presentation.
00:05:00
Ready
How to use
Set a duration or choose a preset. Start, pause, resume or reset as needed. Time is calculated from a monotonic deadline, so delayed background updates do not accumulate drift. Sound is optional; your device may mute or suspend it in the background.
Common questions
Will a background tab slow down the countdown?
The remaining time uses a deadline rather than counting interval ticks. Display and sound updates may be delayed while the browser suspends the page.