Stopwatch – Free High-Precision Online Stopwatch

High-precision stopwatch using performance.now(). Lap times, best/worst lap markers. Keyboard shortcuts. Pure native implementation.

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Features

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High Precision

Uses performance.now() for sub-millisecond accuracy. No drift.

🏁

Lap Times

Press lap to record intermediate times. See all lap times in a list.

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Best/Worst Laps

Automatically highlights the fastest and slowest laps in your session.

⌨️

Keyboard Shortcuts

Space = Start/Stop, L = Lap, R = Reset. Works when page is focused.

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Privacy First

Pure JavaScript implementation. No data sent anywhere.

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Large Display

Big, clear numbers easy to read from a distance.

How to Use

1

Start

Click Start or press Space to begin the stopwatch.

2

Lap

Press L or click Lap to record a lap time. Lap times appear in a list.

3

Stop

Press Space or click Stop to pause.

4

Reset

Press R or click Reset to clear all times.

Frequently Asked Questions

How accurate is this stopwatch?
Uses performance.now() which provides sub-millisecond resolution and is not affected by system timer drift. It updates the display every 10ms for smooth animation.
What is a lap time?
A lap time records the split at that point. The lap list shows each lap number, its duration, and cumulative time.
How are best/worst laps determined?
The fastest and slowest lap times are automatically highlighted in green and red respectively in the lap list.
Is my data sent to a server?
No. The stopwatch is pure JavaScript using performance.now(). No network requests are made.

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