Free Online Stopwatch — Millisecond Precision & Lap Times
Track elapsed time down to the millisecond with start, pause, resume, reset, and split lap recording.
Our free Online Stopwatch offers precise timekeeping using high-resolution performance timestamps (`performance.now()`). It tracks elapsed hours, minutes, seconds, and milliseconds with lap split logging, clean memory management, and zero timer drift.
How to Use
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Click "Start"
Click the Start button to begin timing immediately with high-resolution millisecond precision.
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Record Laps
Click the "Lap" button while running to record intermediate split times and lap intervals.
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Pause & Resume
Pause the stopwatch at any point and resume seamlessly without losing elapsed time.
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Reset Timekeeper
Click Reset to clear the display back to 00:00:00.000 and wipe recorded lap splits.
Why Use a Web Stopwatch with Millisecond Precision?
Unlike basic timers that can experience lag or drift when tabs switch, our stopwatch uses browser high-resolution timestamps to calculate elapsed time accurately even during multi-tasking.
Features
- Sub-Millisecond Accuracy: Calculated using the monotonic
performance.now()API. - Lap & Split Tracking: Logs each individual lap interval and cumulative split time in a clean responsive table.
- Memory Leak Protection: Timers and request animation loops are cleanly garbage-collected on pause or reset.
- Keyboard Shortcuts: Press Space to start/pause and L to record a lap for rapid operation.
Common Use Cases
Sports & Athletics
Time sprint intervals, swimming laps, circuit workouts, and athletic drills.
Productivity & Work
Track time spent on client tasks, coding sessions, and design sprints.
Speeches & Presentations
Rehearse keynote presentations and debate rounds to stay strictly on schedule.
Science & Cooking
Time chemical reactions, laboratory trials, espresso extraction, and baking steps.
Frequently Asked Questions
How accurate is this online stopwatch?
It operates with millisecond (1/1000th second) accuracy using the monotonic performance clock.
Does the stopwatch keep running if I switch browser tabs?
Yes. Because elapsed time is computed from actual timestamps rather than simple interval ticks, the displayed time remains 100% accurate when you switch tabs.
How many lap times can I record?
You can record unlimited laps in a single session. Each lap shows the split delta and total elapsed time.
Does it work offline?
Yes. Once loaded, the stopwatch runs entirely inside your browser client without sending timer data over the network.
How does authorization work?
Starting a stopwatch session uses your single shared BskyPicker trial or subscription access.
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