Stopwatch
Simple stopwatch with lap times
Stopwatch is a free online tool from BrowserUtils that simple stopwatch with lap times. It runs entirely in your browser — your data never leaves your device. No account required.
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How to use Stopwatch
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About Stopwatch
Free online stopwatch tool. Start, stop, reset, and record lap times with millisecond precision. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
Stopwatch specs
- Runtime
- 100% client-side (browser)
- Built on
- Native Date and Intl.DateTimeFormat APIs with full IANA timezone database support
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
How accurate is the stopwatch?
The stopwatch uses high-resolution timing (performance.now) for sub-millisecond precision, displayed to the nearest hundredth of a second.
Can I record lap times?
Yes, press the Lap button while the stopwatch is running to record split times.
Does the stopwatch keep running if I switch tabs?
Yes. The stopwatch records start time using performance.now and calculates elapsed time on each frame, so switching tabs does not cause drift or loss of accuracy.
Can I copy or export the lap times?
Lap times are displayed in a list that you can select and copy. This makes it easy to paste them into a spreadsheet or document for further analysis.
How is the online stopwatch different from a phone stopwatch?
It works the same way but runs in a browser tab, which is convenient when you are already at a computer. The precision is comparable to phone stopwatches for everyday timing tasks.
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