A simple stopwatch with start, stop, and reset controls.
Timer
A simple stopwatch with start, stop, and reset controls.
About the timer
Accurate elapsed time
The timer is a count-up stopwatch. It uses real timestamps plus accumulated elapsed time, so display refresh timing or a background tab does not make the recorded duration fall behind.
Lap records
Each lap stores the cumulative elapsed time at that moment. The lap list shows both the split from the previous lap and the total elapsed time, with the newest lap first.
Local page state
Timing and lap data stay in the page state only. Reset clears both, and closing or refreshing the page starts over; nothing is uploaded to a server.
FAQ
Common questions and answers about this topic.
Does the timer keep counting accurately when I switch tabs or the page is in the background?
Yes. Elapsed time is calculated from real timestamps rather than a simple counter, so even if you switch to another tab or run it for a long time, it shows the true elapsed time when you return — no under-counting.
What is the difference between the timer and the countdown timer?
The timer is a count-up stopwatch that records elapsed time from zero — ideal for measuring how long a task takes. A countdown timer instead counts down from a set duration to zero. If you need a countdown, use the Countdown Timer tool.
Is my timing data sent to a server?
No. Timing runs entirely in your browser and nothing is uploaded. Closing or refreshing the page resets the timer.