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Online Stopwatch & Lap Timer

Record laps, splits and cumulative time, then export CSV.

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About the Online Stopwatch & Lap Timer

Track elapsed time online with a large stopwatch, lap records and downloadable CSV split data. Supports pause and resume.

Formula or method

The stopwatch uses performance.now while running. Each lap captures total elapsed time and the difference from the preceding lap, allowing export to a local CSV.

Worked example

Time a short run, record three laps and download the lap history as CSV.

How to use the tool

  1. Enter the requested settings or select a supported input file.
  2. Use the tool controls to calculate, process or record your results.
  3. Inspect the output and download it when supported.

Common uses

Everyday personal calculations, basic document preparation, timekeeping and image editing.

Assumptions and limitations

Not intended for certified competitive timing. Browser closure loses lap history; the tool does not store session data on a server.

Frequently asked questions

Can I export stopwatch lap times?

Yes, recorded split and cumulative times can be downloaded as a CSV file.

Privacy and support

Your inputs are processed locally in your browser. ToolMosaic does not upload or store the values you enter in this tool. Our tools are free, and we appreciate your support.