Stopwatch
What is Stopwatch? (Quick Answer)
Online stopwatch tool Free online tool, no registration required, 100% client-side processing.
Online stopwatch tool
By Craftisle Team
About Stopwatch — Free Online Tool
How to Use Stopwatch — Step by Step
- Click Start
Press Start to begin timing. The display shows HH:MM:SS.mmm.
- Record laps (optional)
Click Lap to record split times without stopping the main timer.
- Pause or Reset
Pause to freeze the time. Reset to set back to 00:00:00.000.
Use Cases for Stopwatch
Sports timing
Time runs, swims, cycles, or any sporting activity with lap splits.
Productivity tracking
Time how long specific tasks take to identify productivity bottlenecks.
Science experiments
Measure precise time intervals for physics or chemistry experiments.
FAQ — Stopwatch Free Online Tool
How precise is this stopwatch?
It uses performance.now() which has microsecond precision in modern browsers. Display is limited to milliseconds (mmm).
Does the stopwatch keep running if I switch tabs?
Yes. The timer uses the Web Worker API to keep timing accurate even when the tab is in the background.
Is there a limit to lap history?
Up to 99 laps can be recorded in a single session. Older laps scroll off the top.