Does it keep running if I switch tabs?

Yes — it tracks elapsed wall-clock time rather than counting ticks, so background throttling does not make it lose seconds. Return to the tab and the correct total is shown.

Is there a lap or split-time feature?

No — this stopwatch has start, stop and reset only. It tracks a single running total rather than per-segment laps; use reset to zero it between intervals.

How accurate is a browser stopwatch?

It reads the system clock, so accuracy is that of your device — well within what human timing needs. For sub-millisecond engineering measurements, use the benchmark tool instead.

Chronometer — Guide

Monitor the duration of a thing. Basically a chronometer with simple chronometer features.

What it is and when to use it

A minimal stopwatch that runs entirely in the page: start to begin counting, stop to freeze the display, reset to return to zero. Useful as a lightweight timer for coding sprints, meeting segments, brewing instructions — anything where opening your phone is a bigger context switch than a spare tab.

A clean stopwatch for measuring elapsed time in the browser — start, stop and reset.

How to use it

Click start to begin counting
Click stop to freeze the elapsed time
Click reset to return to zero

Things that trip people up

The count is not saved: refreshing the page or navigating away resets it to zero — copy any duration you need before leaving
While the tab is hidden the on-screen number stops repainting, but the next visible update catches up to the true elapsed time, so the total stays wall-clock accurate

Questions people ask

Does it keep running if I switch tabs?: Yes — it tracks elapsed wall-clock time rather than counting ticks, so background throttling does not make it lose seconds. Return to the tab and the correct total is shown.
Is there a lap or split-time feature?: No — this stopwatch has start, stop and reset only. It tracks a single running total rather than per-segment laps; use reset to zero it between intervals.
How accurate is a browser stopwatch?: It reads the system clock, so accuracy is that of your device — well within what human timing needs. For sub-millisecond engineering measurements, use the benchmark tool instead.

Next steps

Open the Chronometer tool

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