Free Online Stopwatch — Millisecond Precision & Lap Times

How accurate is this online stopwatch?

It operates with millisecond (1/1000th second) accuracy using the monotonic performance clock.

Does the stopwatch keep running if I switch browser tabs?

Yes. Because elapsed time is computed from actual timestamps rather than simple interval ticks, the displayed time remains 100% accurate when you switch tabs.

How many lap times can I record?

You can record unlimited laps in a single session. Each lap shows the split delta and total elapsed time.

Does it work offline?

Yes. Once loaded, the stopwatch runs entirely inside your browser client without sending timer data over the network.

How does authorization work?

Starting a stopwatch session uses your single shared RDTPicker trial or subscription access.