Online Stopwatch: Step-by-Step Guide

The Online Stopwatch tool times an activity to the hundredth of a second and lists every lap you record. This guide covers what Start, Lap, Stop, and Reset actually do, how the lap list behaves, and what to expect when you pause and resume.

Last reviewed: 2026-07-02

freetoolonline.com Editorial Team

Start, Stop, and resuming a paused run

Start begins timing from 00:00.00 (or from wherever the display was left after a Stop). The count increases continuously, to the hundredth of a second, with no further clicks needed. Stop pauses the count exactly where it is - the display holds that value rather than resetting. Clicking Start again resumes counting from the paused value, so a Stop-then-Start sequence adds up the running total rather than starting a new run.

Recording laps without stopping the clock

Lap adds the current elapsed time to the list below the display, in the order you click it. Unlike Stop, Lap does not pause anything - the stopwatch keeps counting while the lap list grows, which is what makes it useful for comparing splits during a single continuous run (for example, each kilometre of a run, or each round of an interval workout).

Control	Effect on the clock	Effect on the lap list
Start	Begins or resumes counting up	No change
Lap	No change - clock keeps running	Appends the current time (e.g. 00:42.17) as a new entry
Stop	Pauses at the current value	No change
Reset	Returns to 00:00.00	Clears every recorded lap

Display precision

The display reads in minutes, seconds, and hundredths of a second (MM:SS.hh), for example 00:42.17. It updates continuously while the stopwatch is running, driven by the browser's own clock rather than a server-side timer.

Stopwatch vs. the countdown timer and clock tools

This tool counts up from zero with no end point - it is for measuring how long something takes. The companion countdown timer instead counts down from a duration you set, and the digital clock and analog clock show the current time of day rather than an elapsed duration. Use the stopwatch when you care about how much time has passed; use the countdown timer when you care about time remaining; use the clock tools when you care about the time of day.

Common uses

People use a browser stopwatch for timing a workout set, comparing lap splits during a run or race, running a cooking or study session, rehearsing a presentation, or any other activity where you want a precise elapsed time without installing an app or finding a physical stopwatch.

What this tool does not do

It does not sync to an atomic time server - all timing runs on the browser's own local clock. It does not run in the background: closing the tab or navigating away stops the count, since there is no background process or service worker keeping it alive. It does not play a sound or send a notification on any control, and it does not save a running time or lap list between visits.

Privacy

The stopwatch runs entirely in your browser tab. Nothing you time or record here is uploaded anywhere, no account is required, and the page makes no server round-trip while it runs.

Companion tools

• Online Stopwatch - the tool itself.
• Countdown Timer Online - counts down from a duration you set, instead of counting up.
• Digital Clock Online - a large live HH:MM:SS readout of the current time, not an elapsed timer.
• Analog Clock Online - the same live time as a sweeping clock face.
• Utility tools hub - the rest of the everyday conversion and generator tools on this site.

Frequently asked questions

Does clicking Lap pause the stopwatch?

No. Lap only records the current elapsed time into the list - the clock keeps counting up so you can capture as many splits as you need during one run.

If I click Stop and then Start again, does it restart from zero?

No. Stop pauses at the current value; clicking Start again resumes counting from that same value, so the total keeps adding up instead of restarting.

Does the stopwatch keep running if I switch tabs or close the browser?

Switching to another tab does not stop it - the stopwatch keeps running as long as this tab stays open. Closing the tab, or closing the browser, stops it completely, since there is no background process.

How precise is the display?

The display reads to the hundredth of a second in MM:SS.hh format, driven by the browser's own clock.