Whether you're timing a presentation, a workout interval, a classroom activity, a cooking step or a focused work session, a big clear timer on screen helps. This free online timer and stopwatch combines both in one page. In timer mode, set hours, minutes and seconds or tap a quick preset (1, 5, 10, 15, 25 or 60 minutes), press Start, and a loud, clear beep plays when time is up, with the remaining time also shown in the browser tab title so you can see it while working in another tab. In stopwatch mode, measure elapsed time to the hundredth of a second and record laps or splits, which is ideal for running, swimming, speeches or timing tasks. Unlike simple timers that count ticks and drift when a tab is in the background, this one calculates time from your device's clock, so it stays accurate even if your browser slows the page down. Use the full-screen button to put a huge, readable countdown on a projector or classroom board. The alarm sound is generated in your browser with the Web Audio API, so there are no downloads or ads. Note that phones may pause sound when the screen locks, so keep the screen on for important alarms.
Timer & stopwatch
Laps
How to use the timer and stopwatch
- Choose Timer or Stopwatch.
- For a timer, set the time or tap a preset, then press Start. An alarm sounds at zero.
- For a stopwatch, press Start, tap Lap to record splits, and Pause when done.
- Use Full screen for presentations and classrooms.
Popular timer uses
- 25 minutes: a Pomodoro focus session.
- 1 to 5 minutes: plank, stretching or HIIT intervals.
- 10 to 15 minutes: classroom activities and short breaks.
FAQ
Does the timer keep running in another tab?
Yes. It’s based on your device’s clock, so it stays accurate in the background, and the tab title shows the time left.
Why didn’t I hear the alarm?
Check your volume and that the tab isn’t muted. Browsers only allow sound after you interact with the page, which pressing Start does. Phones may silence sound when the screen locks.
How accurate is the stopwatch?
It displays hundredths of a second and uses a high-resolution clock. Human reaction time (about 0.2 s) is the bigger source of error.
Does it work offline?
Yes, once the page has loaded.
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