Stopwatch & Timer
Stopwatch, countdown timer and laps.
Runs entirely in your browser. Nothing you enter or upload leaves your device.
What the stopwatch and timer do
This page holds two clocks. The stopwatch counts up from zero and records laps, which suits timing a run, a speech rehearsal, a presentation or a science experiment. The countdown timer counts down from a time you set and alerts you when it reaches zero.
The timer is useful for cooking, exams and quizzes, short workouts, meetings and focused work sessions. Presets cover common lengths from 1 minute to 1 hour, including 25 minutes for a work-and-break routine.
How to use the stopwatch and timer
- For the stopwatch, press Start, then Lap to record splits. Space, L and R work as shortcuts.
- For the timer, switch to Timer, set hours, minutes and seconds, then press Start. A preset starts counting straight away.
- When time is up, the clock turns red, the tab title changes and a short sound plays. Untick the sound option if you prefer silence.
Understanding the results
Each lap shows its own split, marked with a plus sign, next to the total time when you pressed Lap. Once you have three or more laps, the fastest and slowest are labelled. Copy laps copies them as tab-separated rows, which paste neatly into a spreadsheet.
While the timer runs, the time left also shows in the browser tab title, so you can keep an eye on it from another tab. Pause stops the countdown where it is, Resume carries on from the same point, and Reset goes back to the time in the boxes.
Questions
How accurate is it?
Times are measured with your browser’s high-resolution clock. The stopwatch shows hundredths of a second and the timer shows whole seconds. Background tabs may update the display less often, but the measured time stays correct.
Will the timer work if I switch tabs?
Yes. The time left is worked out from the clock, not by counting ticks, so it does not drift. Browsers check timers less often in background tabs, though, so the alarm can sound a little late there. Keep the tab open, and in view when the exact moment matters.
Why didn’t I hear the alarm?
Browsers only allow sound after you interact with the page, and your device volume must be on. Check that Play a sound when time is up is ticked.
Why don’t the keyboard shortcuts work?
They only work while the stopwatch is showing and no box or button has focus, which happens right after you click one. Click an empty part of the page and try again.
Are my laps saved?
No. The page remembers whether you last used the stopwatch or the timer, but laps and running times are lost if you close or reload the tab, so copy them first.