Online Clock With Milliseconds

About this tool

This clock with milliseconds shows local time in hours, minutes, seconds, and milliseconds, then adds a practical stopwatch for timing short tasks. The display updates smoothly while the browser tab is active and gives you a simple millisecond timer without installing software.

Use it for testing animations, checking short workflow timings, practicing reaction tasks, or running a count up timer during a small experiment. Browser timers are convenient, but they are not laboratory instruments: background tabs, battery saving, and system load can reduce precision. For everyday timing, the stopwatch, lap list, and reset controls are quick and clear.

The page is 100% free, runs in your browser, nothing is uploaded, and no account is needed. Keep the tab visible during timing work because browsers may slow animation frames when a page is hidden or the device is saving power. For official timing, use dedicated timing hardware when precision matters most.

How to use it

1. Keep the page open to view the live local clock to the millisecond.
2. Press Start to run the stopwatch count-up timer.
3. Use Lap to record split times, Stop to pause, and Reset to clear the timer.

Millisecond Timer

The stopwatch panel works as a millisecond timer for short tasks, demos, and browser timing checks.

Clock to the Millisecond

The live display reads the local system clock to the millisecond while the tab is active.

Timer Count Up

Press Start to run a timer count up from zero, then pause or reset as needed.

Count Up Timer

The lap list records split points from the count up timer so you can compare short intervals.

Time ms

The ms section uses three digits for milliseconds, which is useful for quick visual timing references.

FAQ

How do I see a clock that shows milliseconds?

Open this page and the top display will show your local clock with a three-digit millisecond section.

What is the most accurate online stopwatch?

A browser stopwatch is accurate enough for everyday timing, but dedicated hardware is better for scientific or official measurement.

How do I use a count-up timer online?

Press Start in the stopwatch section, let it count upward, then pause, lap, or reset whenever needed.

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