Stopwatch, Countdown & World Clock

This tool combines three everyday time tools — a stopwatch, a countdown timer, and a world clock — in one page that runs entirely in your browser.

Switch between them with a tap. Nothing is installed, and nothing is uploaded.

Three tools in one

1. Stopwatch. Start, pause, and record laps down to the millisecond.
2. Countdown timer. Set hours, minutes, and seconds, then let it chime at zero.
3. World clock. Add any time zone and watch the live time and date update every second.

Accurate and private

The timers measure real elapsed time rather than counting frames, so they stay correct even if the tab is hidden. The display simply resynchronises when you look back.

Because it all runs locally, there is no sign-up and no data leaves your device.

• Lap splits: capture and compare timing points.
• Audible alarm: a chime marks the end of a countdown.
• Live zones: compare times across cities at a glance.
• Private: nothing is uploaded or installed.

Related timing tools

For focused work sessions rather than a plain countdown, the Pomodoro Timer runs work-and-break cycles with a session counter.

When you need to settle something by chance instead of timing it, the Coin Flip & Dice Roller gives a fair result. And to convert a specific moment into a Unix timestamp for code, the Unix Timestamp Converter handles the maths.

Frequently Asked Questions

Do the timers keep running if I switch tabs?

The stopwatch and countdown use real elapsed time, so they stay accurate even if the tab is in the background. The on-screen display simply catches up when you return to the tab.

Does the countdown make a sound?

Yes. When the countdown reaches zero it plays a short chime using the browser's audio, so you do not have to watch the screen.

Is anything installed or uploaded?

No. Everything runs in your browser with plain JavaScript, so there is nothing to install and nothing is ever uploaded.

Which time zones does the world clock support?

It supports every time zone your browser knows about through the built-in internationalisation data, covering all major cities and regions.

Can I track lap times?

Yes. The stopwatch has a Lap button that records a split each time you press it, showing both the lap time and the total.