Stopwatch
Precise stopwatch with lap times — millisecond accuracy
🔒 Files never leave your browser
00:00:00.00
How to Use Stopwatch
Start
Click Start to begin the stopwatch.
Record laps
Click Lap to record split times.
Stop and review
Click Stop to pause, then review your lap times.
Why Choose AllTools Stopwatch?
- ✓ 100% free, no account needed
- ✓ Millisecond precision
- ✓ Lap time recording
- ✓ Split time display
- ✓ Start, stop, lap, reset
- ✓ No data stored or transmitted
Related Resources
Frequently Asked Questions
How precise is it? ▼
Uses performance.now() for millisecond precision.
Can I record lap times? ▼
Yes. Click the Lap button while running to record split times without stopping.
Is this private? ▼
Yes. Everything runs in your browser.
Is there a file size limit? ▼
No strict limit. Processing happens in your browser, so capacity depends on your device memory. Most files work smoothly.
Which browsers are supported? ▼
All modern browsers including Chrome, Firefox, Safari, Edge, and Opera on both desktop and mobile.
Can I use this offline? ▼
Yes. Once the page is loaded, the tool works without an internet connection since all processing is local.
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