Does the stopwatch continue in a background tab?
Yes. A background tab may update less often, but the elapsed time is recalculated when you return.
A simple stopwatch that runs entirely in your browser. Use Start to begin timing, Pause to hold, Reset to clear, and Lap to record split times. No data is sent to the server.
Each lap records the total elapsed time at that moment, which is useful for repeated tests, practice intervals, QA steps, presentations, or comparing several attempts. Pausing keeps the accumulated duration so timing can continue from the same point.
The stopwatch uses the browser's monotonic high-resolution clock, so changing the system clock does not move the timer backward or forward. The display shows milliseconds, but browser scheduling and device load mean it should not be treated as laboratory or competition-grade timing equipment.
Elapsed time can continue correctly after a background tab resumes, but laps and stopwatch state are not saved. Reloading or closing the page clears the current session.
Yes. A background tab may update less often, but the elapsed time is recalculated when you return.
No. Reloading or closing the page starts a new stopwatch session and clears the elapsed time and laps.
Each lap records the total elapsed time at the moment you press Lap. Reset clears every recorded lap.
It is suitable for everyday timing, practice, study, and informal tests. It is not a calibrated instrument for official or laboratory measurements.
Related tools: Countdown Timer · Online Clock · Time Calculator