Online Stopwatch

This stopwatch does not just add up ticks — it saves the moment you hit Start and reads the difference against your device clock on every frame. That distinction matters, because browsers slow down timers running in a tab you are not looking at. A stopwatch that only counts its own ticks starts losing time the moment you switch away; this one does not, because it is always checking the real clock instead of counting to itself.

Switch tabs, lock your phone, come back after a meeting, and the time is still exactly right. The readout runs HH:MM:SS.cs, refreshed every ten milliseconds, in tabular figures so the digits do not jump around as they change.

Hit Lap, or press L, to mark a split without stopping the clock. Each row shows the split — the time since your last lap — right next to the running total, which is exactly what you need when you are timing intervals, sets, or the same drill run after run.

Every lap stays on the list until you reset, and you can copy the whole thing as plain text straight into a notes app or a spreadsheet. The keyboard is the fastest way to run it: Space starts and pauses, L records a lap, R resets, and Esc cancels a reset you did not mean to start. Every shortcut is also a real on-screen button, so it works the same way with a screen reader or a switch device.

This stopwatch runs entirely in your browser. Your start time, your accumulated milliseconds, and your lap list are saved to local storage on your own device, under one key — so closing the tab by accident or reloading the page does not wipe a stopwatch that is still running. Nothing gets uploaded, and there is no account to sign up for.

The stopwatch itself is completely free, with no cap on how long you run it and no ads interrupting you. Once you need to turn measured time into hours worked, the hours calculator takes your time in and time out and computes the total and the pay; the timesheet does the same across a full week, or for more than one person.