Online Stopwatch with Laps — Millisecond Precision, CSV Export
A precise online stopwatch with lap recording, keyboard controls (space to start/stop, L for lap) and one-click CSV copy. Free, works offline.
How to use this tool
- 1
Press Start (or hit Space) to begin timing.
- 2
Press Lap (or L) to record splits without stopping.
- 3
Stop with Space, and reset with R when you're done.
- 4
Copy your lap table as CSV for your records.
Frequently asked questions
▸How precise is it?
Hundredths of a second are displayed (milliseconds measured internally) using timestamp math, so the stopwatch stays exact even if the tab is throttled or backgrounded mid-run.
▸Are there keyboard controls?
Yes — Space starts/stops, L records a lap, and R resets. The keys work whenever the stopwatch page is focused.
▸Can I export my laps?
Yes — copy the lap table as CSV with one click and paste it into any spreadsheet. Nothing is uploaded; laps live only in this tab until you reset.