About Countdown Timer
Run a drift-resistant countdown with hours, minutes, seconds, pause and reset controls, a large display, and a completion chime that repeats for a selected duration.
Countdown Timer runs entirely in the current browser tab and calculates the display from a fixed target time, avoiding the cumulative drift caused by simply subtracting one every second. A short synthesized chime repeats at a measured interval for the selected 5-to-60-second duration. No audio file is downloaded or uploaded.
How to use it
- Choose the hours, minutes, and seconds.
- Select the completion sound and its 5-to-60-second duration.
- Start the timer, then pause or reset when needed; leave the page open to hear the final chime.
Common use cases
- Time a focused work or study interval.
- Keep track of cooking, stretching, or a short household task.
- Set a visible limit for a presentation, meeting segment, or classroom activity.
Worked example
Set five minutes for a focused task, then repeat a moderate three-note chime for 5 seconds at zero.
Limitations and responsible use
- The page must remain open; closing it ends the timer and its sound.
- Browsers can delay background activity or suspend tabs, although the target-time calculation corrects the displayed remaining time when execution resumes.
- The completion chime depends on browser audio support and the device volume or mute setting.
Frequently asked questions
Will the timer keep accurate time in a background tab?
It uses an absolute target time, so delayed updates do not accumulate drift. A browser or operating system may still suspend the tab and delay the final sound.
Is the completion sound an alarm?
No. It is a spaced three-note sine-wave chime with soft and medium volume choices, plus an off option. Its repeat duration can be set from 5 to 60 seconds.