Online Stopwatch
Measure elapsed time and laps with a precise stopwatch that handles background pauses.
Space: start/pause · L: lap · R: reset
Timestamp-based measurement
The stopwatch derives elapsed time from timestamps instead of adding interval ticks. This prevents accumulated drift when the tab is deprioritized.
Laps
Record splits during a session and compare them without stopping the main clock.
Frequently asked questions
Does it keep time in the background?
Yes. When you return, it recalculates elapsed time from the real timestamp.