What is Online Stopwatch & Lap Timer?
Uses performance.now() for sub-millisecond accuracy. Records unlimited lap/split times with running totals. Essential for timing code execution, presentations, exams, and athletic training.
How to Use Online Stopwatch & Lap Timer
- Press Start to begin timing.
- Press Lap to record a split without stopping.
- Press Stop to pause, Reset to clear.
Frequently Asked Questions
How accurate is the browser stopwatch?
performance.now() provides sub-millisecond resolution. For production profiling, use browser DevTools or Node.js performance module.