⏱️ Stopwatch
Online stopwatch with lap timing. Millisecond precision. Start, pause, lap, reset.
📋 When to Use the Stopwatch
The Stopwatch fits into your daily workflow whenever you need a quick productivity boost. Use it during focused work sessions, between meetings, or as part of your regular toolkit. It's designed for professionals who value efficiency — project managers, developers, writers, and anyone juggling multiple tasks. No account setup, no learning curve — just open the page and get things done.
⚙️ How the Stopwatch Works
The Stopwatch operates as a single-page application in your browser. When you interact with the controls — buttons, inputs, timers — JavaScript event handlers respond instantly, updating the DOM (Document Object Model) without page reloads. State is managed in memory and optionally persisted to localStorage so you can pick up where you left off. The tool uses the browser's built-in timing APIs (setTimeout, setInterval, requestAnimationFrame) for accurate tracking and responsive feedback.
How to Use the Stopwatch
- Click Start — The timer begins counting with millisecond precision.
- Record laps — Click the Lap button (appears after starting) to capture split times. Each lap is listed below.
- Pause and resume — The Start button toggles between Start and Pause. Laps and elapsed time are preserved while paused.
- Reset to zero — Click Reset to clear the timer and all lap records, returning to 00:00.000.
Frequently Asked Questions
How accurate is the stopwatch?
The stopwatch uses JavaScript's high-resolution timer for millisecond precision. It's accurate enough for sports timing, experiments, and productivity tracking — but not for professional race timing.
Does it keep running if I switch tabs?
Yes! The stopwatch continues running even when the tab is in the background. The display updates based on elapsed system time, so it stays accurate.
Can I export my lap times?
Currently, lap times are displayed in the browser only. You can copy them manually or take a screenshot.
What's the maximum time?
The stopwatch can run indefinitely — hours, days, or longer. There's no built-in time limit.