How accurate is a browser-based stopwatch?

Modern browsers have millisecond accuracy for timing using the performance.now() API, which provides sub-millisecond resolution. However, JavaScript execution timing can add a few milliseconds of jitter during heavy page loads.

Will the stopwatch continue running if I switch browser tabs?

Yes. The timer continues counting even when the tab is in the background, as it uses the system clock rather than counting animation frames.

Can I time multiple things simultaneously?

The stopwatch tracks one elapsed time with multiple lap points. For timing multiple independent things simultaneously, open the tool in multiple browser tabs — each tab runs its own independent timer.

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Stopwatch

Name: Stopwatch
Rating: 4.8 (120 reviews)
Author: DailyDevTools

Simple browser-based stopwatch

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What is Stopwatch?

A precise browser-based stopwatch is useful for timing code performance, measuring task duration, tracking exercise intervals, and general timekeeping. DailyDevTools' Stopwatch provides millisecond precision, lap time recording with split analysis, and a clear display — all without installing any app. Results are exportable for logging.

How to use Stopwatch

1Click Start to begin timing — the stopwatch counts in hours:minutes:seconds.milliseconds
2Click Lap to record a split time without stopping the main timer
3Click Stop to pause, then Start again to resume from the same time
4Click Reset to clear all times, or Export to save your lap times as a CSV

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Stopwatch

What is Stopwatch?

How to use Stopwatch

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