📋 Lap Records
Click "Start" to begin timing, then press "Lap" to record each lap
What is an Online Chronograph?
An online chronograph is a precision lap timer that runs entirely in your browser. With millisecond accuracy, you can record lap times and split times for running, swimming, cycling, racing and any sports training. No software installation, no account registration — just open the page and start timing. All timing data is processed locally and never uploaded to any server, ensuring complete privacy.
Use Cases
- Track lap times during running or swimming training
- Time split sessions for interval workouts
- Compare fastest and slowest laps for race analysis
- Quick timing on mobile without a dedicated stopwatch app
Key Features
- Completely Free: No registration, free forever
- Millisecond Accuracy: Uses the browser's high-resolution timer
- Local Processing: All data stays in your browser
- Export CSV: Download lap data for spreadsheet analysis
Is the Online Chronograph accurate?
Yes. It uses the browser's performance.now() API with 1-millisecond precision, which is more accurate than traditional Date-based timers.
Do I need internet to use the Online Chronograph?
You need internet to load the page initially. Once loaded, the tool works offline.
Is my data recorded anywhere?
No. This tool has no backend server. All data exists only in your browser's memory until you leave or reset the page.