Online Stopwatch
Precise stopwatch with lap times and milliseconds
About Online Stopwatch
Online Stopwatch is a precise, browser-based timing tool designed for athletes, coaches, students, and anyone who needs accurate time tracking. Whether you are timing workouts, measuring productivity intervals, or coordinating events, this stopwatch delivers millisecond precision without any downloads or installations required.
All processing happens locally in your browser, meaning your timing data never leaves your device-completely private and secure. The intuitive interface makes it easy to start, stop, and record lap times instantly, while the clean design keeps distractions to a minimum.
How to use Online Stopwatch
Start the Timer
Click the Start button to begin timing immediately. The stopwatch will display elapsed time in real-time with hours, minutes, seconds, and milliseconds.
Record Lap Times
Press the Lap button whenever you complete a segment or interval. Each lap is automatically timestamped and added to your history without stopping the overall timer.
Stop and Review Results
Click Stop to end the timer, then review all your lap times, export the data, or reset to start a new session.
Pro Tips
- Use lap times to track splits during workouts-each lap automatically calculates the time since the previous lap, helping you monitor pace consistency.
- For quick intervals (Pomodoro, HIIT training), keep the window visible on a second screen or phone so you can glance at time without switching tabs.
- Export your stopwatch results regularly to build a personal database of times-great for tracking improvement over weeks or months.
- Reset between sessions to keep your lap list clean and manageable, or take a screenshot of results before clearing to maintain your own records.
Key features of Online Stopwatch
Millisecond Precision
Track time accurate to one thousandth of a second for professional-grade timing.
Unlimited Lap Recording
Capture as many lap times as needed with automatic timestamps and split calculations.
Real-time Display
Large, easy-to-read time display that updates instantly as you track.
Lap History
View all recorded laps with individual times and cumulative totals in one organized list.
Download Results
Export your stopwatch data and lap times as a file for records or analysis.
Fully Offline
Works completely in your browser with no internet connection required after loading.
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