# Stopwatch

> A clean online stopwatch with laps, millisecond precision, and keyboard shortcuts. Runs in your browser.

URL: https://uttir.com/stopwatch
Categories: date-time-tools, calculators
Privacy: All timing happens in your browser. No data is uploaded.

## About

A no-frills online stopwatch: start, stop, reset, and capture laps. Times are accurate to the millisecond and displayed in a large, easy-to-read format. Laps are recorded with both the lap time and the cumulative time so you can see splits.

Useful for timing sprints, workouts, study sessions, cooking, or anything else that benefits from a clear, accurate timer that does not need a separate app.

## How to use

1. **Start** — Press Start (or Space) to begin timing.
2. **Lap or pause** — Press Lap to record a split. Press Pause (or Space) to stop.
3. **Reset** — When paused, press Reset to clear.

## Examples

### Sprint interval

Start the timer, run for 30 seconds, hit Lap, repeat.

Output:

```
Lap 1: 00:30.12 · Lap 2: 01:00.34 · …
```

## FAQ

### How accurate is it?

Accurate to the millisecond, limited only by your browser and display refresh rate. The timer uses Date.now() and setInterval, so it is not affected by the cost of re-rendering.

### Does it work when I switch tabs?

Yes. The browser may throttle setInterval in background tabs, but the elapsed time calculation is based on timestamps, so the display catches up when you return to the tab.

### Can I save or share lap times?

Yes. The stopwatch tracks laps in the current session and lets you copy individual lap times or the full lap list to your clipboard for pasting into a spreadsheet, email, or chat.

## Related tools

- [Countdown Timer](https://uttir.com/countdown-timer) — Count down to a specific date and time. Set a target, watch the days/hours/minutes/seconds tick down live.
- [Pomodoro Timer](https://uttir.com/pomodoro-timer) — A Pomodoro timer with 25/5/15 defaults. Focus, short break, long break, and session counter. Customizable phase lengths.
- [Date Add/Subtract Calculator](https://uttir.com/date-add-subtract) — Add or subtract days, weeks, months, or years from any date. Handles month-end and leap-year rollovers.

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For the full HTML page with the live tool, visit https://uttir.com/stopwatch.
This file is the markdown rendering at https://uttir.com/stopwatch.md. See https://uttir.com/llms.txt for a site-wide summary.