Online Stopwatch
Precise stopwatch with lap times, fullscreen mode, and keyboard shortcuts. 100% browser-based.
Timer
Ready
How to Use Stopwatch
- 1 Click Start or press Space to begin timing
- 2 Click Lap to record split times
- 3 Click Stop to pause, Resume to continue
- 4 Click Reset to clear everything
- 5 Use fullscreen mode for distraction-free timing
What You Get
Precision stopwatch accurate to milliseconds. Records unlimited lap times with split calculations. Features fullscreen mode, keyboard shortcuts, and optional sound alerts.
Input: Track workout intervals
Output: Lap 1: 00:45.32, Lap 2: 00:42.18, Lap 3: 00:48.91
Input: Time a presentation
Output: Total: 15:32.47 with section markers
Input: Cooking timer
Output: Multiple lap times for recipe steps
How do I use an online stopwatch?
Click Start or press Space to begin timing. Click Stop to pause, Reset to clear. The stopwatch displays hours, minutes, seconds, and milliseconds.
How do I record lap times?
Click the Lap button or press L while the stopwatch is running. Each lap time is recorded with the split from the previous lap. Copy all laps to clipboard.
How accurate is the online stopwatch?
Accurate to 10 milliseconds using the browser high-resolution timer API. For most timing needs, this precision is more than sufficient.
Can I use the stopwatch in fullscreen?
Yes. Click the fullscreen button or press F for distraction-free timing. Press Escape to exit fullscreen. Great for timing presentations.
What keyboard shortcuts does the stopwatch have?
Space = Start/Stop, L = Lap, R = Reset, F = Fullscreen. No mouse required once the page is focused.
Does the stopwatch keep running if I switch tabs?
Yes. The timer continues running in background tabs. However, for best millisecond accuracy, keep the tab visible during critical timing.
How do I copy my lap times?
Click the copy button next to the lap list. All times copy to your clipboard in a formatted list, ready to paste into documents or spreadsheets.
Can I time workouts and intervals?
Yes. Use lap timing to record each interval. The stopwatch shows both lap time and total elapsed time. Perfect for HIIT, running, and exercise tracking.
All timing happens locally in your browser. No data is sent to any server.