Stopwatch

About This Web-Based Stopwatch

This professional online stopwatch gives you millisecond-accurate timing with unlimited laps, keyboard shortcuts, fullscreen, and a floating mini stopwatch (PIP). It runs in your browser with no install or sign-up. The timer keeps running when you switch tabs or minimize the window, and your session (elapsed time and laps) is saved automatically so it survives refresh or browser restart. Use it for workouts, sports, teaching, research, or any task where you need precise, reliable timing.

What You Get

• Main display: Elapsed time in hours, minutes, seconds, and milliseconds (e.g. 00:05:23.456)
• Unlimited laps: Record as many laps as you need; each lap shows total time at that moment and the difference from the previous lap
• Lap export: Copy all laps to the clipboard, or download as CSV or TXT for analysis in spreadsheets or notes
• Mini stopwatch (PIP): A small floating window you can move anywhere; it shows the same time and has its own Start/Pause, Lap, and Reset so you can keep timing while using other apps
• Fullscreen mode: Expand the stopwatch to full screen for visibility from a distance or in low light
• Auto-save: Elapsed time and lap list are stored locally; if you close the tab or browser and return later, the timer can resume from where it was (optional sound for lap feedback)

Features

• Millisecond accuracy: Timing updates in real time with three decimal places for seconds
• Runs in background: Timer continues when you switch tabs or windows so you don’t lose time
• Keyboard shortcuts: Control everything from the keyboard — no mouse required (see How to Use)
• Dark and light theme: Toggle between themes for comfort in any environment; preference is remembered
• Optional sound: Enable or disable audio feedback when you record a lap
• Copy, CSV, TXT: Copy laps to clipboard, or download as CSV (for Excel/Sheets) or plain TXT
• Clear laps: Remove all laps in one action (with confirmation so you don’t clear by mistake)
• Responsive design: Works on desktop, tablet, and mobile; no app install needed
• Privacy and offline: All data stays on your device; the app works offline once the page is loaded

How to Use

1. Start/Pause: Click the Start button or press Space. Press again to pause; press again to resume.
2. Lap: While the timer is running (or paused at a time you want to mark), click Lap or press L to record a lap. Each lap shows total elapsed time and the difference from the previous lap.
3. Reset: Click Reset or press R to set the timer back to 00:00:00.000. Laps are kept until you clear them.
4. Export laps: Use Copy to paste laps into a document, or use CSV / TXT to download a file.
5. Fullscreen: Open the settings (gear) menu and turn on Fullscreen, or press F.
6. Mini stopwatch (PIP): In the settings menu, turn on Mini stopwatch, or press P. Drag the small window where you want it; use its buttons to Start/Pause, Lap, and Reset without switching back to the main page.
7. Help: Press ? or open Keyboard shortcuts from the settings menu to see all shortcuts.

Keyboard Shortcuts

• Space — Start / Pause
• L — Record lap
• R — Reset timer
• D — Toggle dark/light theme
• F — Toggle fullscreen
• P — Toggle mini stopwatch (PIP)
• ? — Show keyboard shortcuts help

Use Cases

Use this stopwatch for sports and athletics (lap times, intervals, drills), fitness (workout rounds, rest periods, HIIT), education (timed tests, activities, presentations), research and labs (experiment duration, reaction time), media production (timing segments), and everyday tasks (cooking, reading, focus sessions). The floating mini stopwatch is especially useful when you need to see the time while using another app or window.

Accuracy and Technology

Timing is driven by the browser’s high-resolution time (milliseconds). The display updates every few milliseconds so the readout stays accurate. When you leave the tab and come back, elapsed time is corrected so you don’t lose or gain time. Data is saved to your device (localStorage) so after a refresh or restart you can continue from the same elapsed time and lap list. The tool works in all modern browsers and does not require a server once the page is loaded.

Privacy and Data

All timing and lap data is stored only on your device. Nothing is sent to any server. We do not use analytics or tracking on this stopwatch. Your use is private and under your control.

Support and Feedback

For suggestions, bug reports, or feedback, please visit our contact page. We’re glad to hear from you.