Online Stopwatch
An online stopwatch counts up from zero so you can measure exactly how long something takes — a workout, a study sprint, a lap around the track — with start, stop and lap controls in your browser.
Press Start to begin timing, Lap to record a split, Stop to pause and Reset to clear. Each lap shows its own time and the cumulative total, and the fastest and slowest laps are highlighted automatically.
00:00:00.00
Tip: Space starts/stops, L records a lap, R resets.
| Lap | Lap time | Total |
|---|
How to use the stopwatch
Press Start to begin counting up from zero. The readout shows hours, minutes, seconds and centiseconds (HH:MM:SS.cc), and the browser tab title updates too, so you can keep an eye on it from another tab.
Tap Lap whenever you want to mark a split — each press adds a row showing that lap's time and the running total. Press Stop to pause and Resume to continue from where you left off. Reset clears the time and all laps.
Prefer the keyboard? Space starts and stops, L records a lap, and R resets — as long as you are not typing in a field.
Everything runs in your browser using your device's clock — nothing is uploaded, and there's no sign-up.
Lap and split times
Lap time is how long that individual lap took. Total (the cumulative split) is the elapsed time from the start up to that lap. The fastest lap is marked as best and the slowest as worst once you have at least two laps, so you can spot your strongest and weakest segments at a glance.
Use Copy laps to copy the whole table as plain text you can paste into a note, spreadsheet or message.
Stopwatch questions
What's the difference between a stopwatch and a timer? A stopwatch counts up to measure how long something takes; a countdown timer counts down from a duration and alerts you at zero. Want a focus-and-break cycle instead? Try the Pomodoro timer.
Are my lap times saved? They stay on screen while the page is open and you can copy them out, but they are not stored anywhere — reloading clears them.
Does it keep accurate time if I switch tabs? Yes. The elapsed time is computed from the device clock, not by counting frames, so background-tab throttling doesn't make it drift.
Is it really free and private? Yes — no sign-up, and it runs entirely in your browser.