Stopwatch
NewA precise stopwatch with lap tracking, fastest/slowest lap highlighting.
Stopwatch
Stopwatch
Track elapsed time precisely with pause/resume support and lap splits powered by performance.now().
Elapsed time
Frequently Asked Questions
What is Stopwatch?
Stopwatch is a free, browser-based tool that a precise stopwatch with lap tracking, fastest/slowest lap highlighting. No installation or account is required — it works instantly in any modern browser.
How does Stopwatch work?
Stopwatch processes your input locally in the browser using JavaScript. Simply paste or type your data, configure any available options, and the result is displayed immediately.
Is Stopwatch free?
Yes, completely free. All tools on Web Developer Toolbox are free to use with no limits, no premium features, and no account required.
Does Stopwatch work offline?
Yes. When you install Web Developer Toolbox as a Progressive Web App (PWA), all tools including Stopwatch work fully offline via a service worker cache.
Is my data private when using Stopwatch?
Yes. All data processing happens entirely in your browser. Nothing is sent to a server — your data stays on your device and is cleared when you close or refresh the page.