Stopwatch
A simple online stopwatch with start, pause, lap and reset.
Quick answer: Stopwatch: a simple online stopwatch with start, pause, lap and reset. Runs entirely in your browser, free, no signup.
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Good to know
The detail that separates a reliable stopwatch from a flaky one is how it measures elapsed time. This one is anchored to wall-clock time rather than counting ticks, which means it keeps accurate time even when the browser throttles a backgrounded tab — a common failure mode where naive timers drift or freeze the moment you switch away. Precision is a hundredth of a second, bounded by browser timer resolution.
The lap function is what makes a stopwatch useful beyond a raw total: each lap records a split without stopping the clock, so you can capture per-rep or per-interval times and compare them at a glance. Laps live only for the current session, so copy anything you need to keep before refreshing, since a reload clears them.
For counting down toward a deadline rather than up from zero, the Countdown Timer is the counterpart tool, and it encodes its target into the URL so a countdown can be bookmarked or shared. A stopwatch, by contrast, is about measuring an interval that starts right now.
Frequently asked questions
- Is the stopwatch free?
- Yes — free with no signup.
- Will it keep running if I switch tabs?
- Yes — the timer is anchored to wall-clock time, so it stays accurate even when the tab is backgrounded.
- Are my laps saved?
- Only for the current session. Refreshing the page clears them.
- How precise is it?
- Accurate to 1/100th of a second — limited by browser timer resolution.
- Is anything uploaded?
- No — the stopwatch runs entirely in your browser.