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Online Stopwatch

Free online stopwatch with millisecond accuracy, unlimited lap tracking, and CSV export.

00:00.00
Running
Current Lap (#) 00:00.00
Laps
Best Lap
Worst Lap
Recent Laps
🏁

No laps recorded yet

Start the stopwatch and tap Lap to record lap times.

laps recorded
Lap Split Total

💡 How to Use This Tool

Time anything with precision. Follow these simple steps:

1

Press Start

Tap the large button to begin timing. The display shows hours, minutes, seconds, and centiseconds.

2

Record Laps

Tap Lap to record split times. Each lap captures the split and cumulative time.

3

Pause & Resume

Tap the main button to pause. Press it again to continue from where you left off.

4

Export Results

Switch to the Lap Times tab to copy all splits or download a CSV file for analysis.

📖 About Online Stopwatch

What is an Online Stopwatch?

An online stopwatch is a browser-based timer that measures elapsed time with precision. Unlike physical stopwatches, our free online stopwatch works instantly in your browser — no download, no app, no sign-up required.

Common Use Cases

  • Sports & Athletics: Time races, workouts, interval training sessions, and performance benchmarks.
  • Cooking & Baking: Track boiling, steaming, or baking times with accuracy.
  • Presentations & Speeches: Practice talks and stay within time limits.
  • HIIT & Exercise: Measure work and rest intervals during high-intensity training.
  • Lab & Science: Record experimental durations with millisecond precision.
  • Gaming & Speedruns: Track game completion times and personal bests.
  • Meetings & Standups: Keep team discussions on schedule.

Key Features

Millisecond Accuracy

Our stopwatch measures time to the nearest centisecond (1/100th of a second), giving you the precision you need for athletic and scientific timing.

Unlimited Lap Recording

Record as many laps as you need. Each lap shows the split time (time for that lap) and cumulative time from the start, so you can easily compare performance across intervals.

Best & Worst Lap Highlighting

Automatically highlights your fastest lap in green and slowest lap in red, giving you instant visual feedback on your performance variation.

Export Your Results

Copy your lap times as plain text or download them as a CSV file for analysis in Excel, Google Sheets, or any spreadsheet application.

Privacy & Security

All timing happens locally in your browser using JavaScript's high-resolution timer APIs. No data is sent to any server — your lap times and records stay completely private on your device.

Technical Details

This stopwatch uses performance.now() for high-resolution timing, which is immune to system clock adjustments and provides sub-millisecond precision. The display updates every 10ms for a smooth and responsive experience.

❓ Frequently Asked Questions

Yes! This stopwatch uses your browser's high-resolution performance timer (performance.now()), which provides millisecond-level accuracy and is immune to system clock changes. It's suitable for timing sports, experiments, and professional use.
You can record unlimited laps. All lap data is stored in your browser's memory during the session, so you can track as many intervals as you need.
Yes! You can copy all lap times to your clipboard as formatted text, or download them as a CSV file for analysis in Excel, Google Sheets, or any spreadsheet application.
The stopwatch continues running even if you switch browser tabs. However, the display may update less frequently when the tab is hidden due to browser performance optimizations. The total elapsed time remains accurate.
Yes! All timing and lap data is processed entirely in your browser. Nothing is sent to any server — your data stays completely private on your device.
Absolutely! This stopwatch is fully responsive and works perfectly on smartphones and tablets. All features including lap recording and CSV export are available on mobile devices.

Version History

1.0.0

Initial release with lap tracking, best/worst lap highlighting, and CSV export.

Feb 19, 2026