Online Stopwatch — Free Millisecond Precision Lap Timer

100% Free & Unbiased Decision Wheel Tool
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Online Stopwatch is an accurate in-browser digital timer with millisecond resolution, lap split logging, fastest/slowest lap comparison, and instant keyboard shortcuts.

How to Use

  1. Start Timing

    Click "Start" or press the Spacebar to begin timing with millisecond accuracy.

  2. Record Split Laps

    Click "Lap" or press "L" to record split times without stopping the master clock.

  3. Analyze & Reset

    View color-coded fastest and slowest laps, or press "R" to reset the stopwatch.

Whether timing athletic sprints, speedrun gaming, study pomodoros, or speech rehearsals, our Online Stopwatch provides dependable, microsecond-accurate timekeeping via the browser’s high-resolution Performance API.

It runs smoothly across mobile, tablet, and desktop without losing synchronization when switching browser tabs.

Who Uses This

Athletics & Workouts

Time track intervals, HIIT sets, swimming laps, and circuit training splits.

Public Speaking & Pitches

Rehearse presentations, podcast segments, and social video takes within strict limits.

Speedrunning & Cooking

Record precise milestones for video game runs and culinary recipe timing.

Frequently Asked Questions

How accurate is this stopwatch?
It uses window.performance.now() with sub-millisecond precision, unaffected by CPU lag or tab backgrounding.
Are there keyboard shortcuts?
Yes: Spacebar toggles Start/Pause, "L" records a lap, and "R" resets the stopwatch.
Does it highlight fastest and slowest laps?
Yes! The lap log automatically highlights your fastest lap in glowing green and slowest lap in coral.

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