Stopwatch

Client

Start, stop, lap, and reset—fully local.

About Stopwatch & lap timer

Start, stop, reset, and record lap times with centisecond display—runs locally in your browser. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

00:00.00

Nearby workflows on Toolcore

  • Countdown timer — Set a target local date and time—see days, hours, and seconds remaining; updates in your browser. when the same instant should appear as epoch, zone, or cron.
  • Cron expression builder — Compose five-field cron strings with presets—copy for crontab or job schedulers; local only. when the same instant should appear as epoch, zone, or cron.
  • Unix timestamp converter — Epoch to date: seconds, milliseconds, ISO-8601, UTC and local time—in browser. when the same instant should appear as epoch, zone, or cron.
  • World clock & time zones — Compare IANA time zones side by side with the same instant—no server round-trip. when the same instant should appear as epoch, zone, or cron.

Common use cases

  • Time quick manual QA passes without opening a phone app.
  • Record lap splits during a presentation or demo rehearsal.
  • Rough-duration checks next to timestamp and cron tools.

Common mistakes to avoid

  • Expecting millisecond lab precision

    Display uses requestAnimationFrame—fine for humans, not for benchmarks.

  • Background tab accuracy

    Browsers may throttle timers when the tab is inactive.

FAQ

Does timing need the network?

No. Elapsed time uses performance.now in your tab.

Are laps saved?

Laps reset when you reload or press Reset.

More tools

Related utilities you can open in another tab—mostly client-side.