Can I switch tabs while it runs?

Yes, both clocks read from a fixed timestamp, so a throttled tab costs the display, not the time.

Stopwatch & Timer

No upload · runs in your browser

00:00.00

Timed on your device with the browser clock, nothing is uploaded.

How it works

Online Stopwatch and Countdown Timer with Laps

A stopwatch with lap splits and a countdown with an audible alarm, both read straight from the browser's high-resolution clock so they never drift.

What this does

Stopwatch to a hundredth of a second, read from the browser’s high-resolution clock
Laps listed newest first, each showing its own split beside the running total
Fastest and slowest splits are summarised above the table, alongside the average
Countdown presets from 1 minute to 1 hour, or type anything up to 23:59:59
+1 min stretches a running countdown without restarting it

FAQ

Browsers refuse to make noise until you have interacted with the page, so the audio graph is built the moment you press Start on the countdown, start it, and the four alternating 880 and 660 Hz beeps at the end will play. A muted tab, a device on silent, or an operating system that froze the tab outright can still swallow them, even though the countdown itself finished on time.

Keep going