100% Free • Zero Server Uploads • Private
Stopwatch
High-precision online stopwatch with millisecond timing, split lap recording, and keyboard controls.
00:00:00.00
Lap Times
No laps recorded yet
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100% Client-Side Privacy
All computation happens right in your browser's JavaScript engine. No data is ever sent to any remote server.
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Instant Results
Zero network latency. Calculations and formatting are executed instantly with high cryptographic and mathematical precision.
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Works Offline
Once loaded, this tool can function completely offline with no active internet connection required.
Frequently Asked Questions
How accurate is the stopwatch?
It uses performance.now() to measure time with sub-millisecond precision.
Does it keep running if I switch tabs?
Yes, elapsed time is calculated from wall-clock timestamps rather than interval counts.