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Stopwatch

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About this tool

Precise stopwatch with millisecond accuracy and lap timer. Built-in countdown timer tab. Works even when the tab is in the background.

Privacy and details

Your files never leave your device.

Fast browser processing with no account required.

Optimized for desktop and mobile with accessible controls.

How to use
  1. Click Start to begin the stopwatch.
  2. Click Lap to record a split time while the stopwatch is running.
  3. Click Stop to pause, then Start again to resume.
  4. Switch to the Countdown tab to set a timer in hours, minutes, and seconds.
Why use this tool

Whether timing workouts, cooking, presentations, or experiments, a reliable stopwatch with lap support is a daily tool. This one works accurately even when you switch browser tabs, using clock-difference timing.