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Free Online Stopwatch & Countdown Timer | OnlineToolsPro

100% Client-Side: Your data never leaves your browser. Zero server processing or data storage.

Precision Stopwatch & Lap Timer

Millisecond-accurate online stopwatch with lap recording, average lap calculations, keyboard shortcuts, and CSV export.

00:00.00
Shortcuts: Space (Start/Pause) • L (Lap) • R (Reset)
Lap # Lap Split Time Total Elapsed
No laps recorded yet
Total Laps: 0

High-Precision Millisecond Timing

This stopwatch utilizes the browser's performance.now() high-resolution timestamp API, preventing background tab throttling and drift associated with standard timers.

Frequently Asked Questions

Does the stopwatch keep running if I switch tabs?
Yes. The timer calculates elapsed time based on absolute timestamps, ensuring accurate timing even if the browser tab is minimized.

Is data recorded locally?
Yes. All lap split times and timer data remain 100% in local browser memory.