Start or resume
Elapsed time is derived from the browser monotonic clock, not a counter of repaint callbacks.
One reliable informal session
Online stopwatch with exact lap and split evidence
Start immediately, pause without losing elapsed time, capture completed segments and export the chronological record. Everything stays in one isolated browser capsule and disappears on reload.
No account · no network · 500 laps · deterministic CSV
Three explicit steps
Start, mark, keep the evidence
Capture a completed segment
Each lap stores its own split and cumulative total, with a hard 500-row limit.
Download chronological CSV
The local file uses fixed columns and the same formatted values shown in the lap table.
Non-critical timing jobs
Useful when an informal segment needs a record
- Rehearse sections of an ordinary presentation and compare completed segment lengths.
- Compare repeated non-production software actions without installing a desktop timer.
- Track board-game turns, reading blocks or meeting sections that have no safety consequence.
Local by construction
Start one clean stopwatch session
Use completed laps as evidence, download before reloading, and keep another method whenever timing matters.