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READY
// start, pause, and record lap times in your browser
Free online stopwatch with start, pause, lap recording, and reset. No download needed. Track elapsed time and lap splits instantly in your browser.
Click the green START button or press Space to begin counting elapsed time.
While running, click LAP to capture a split. Each lap shows lap time, split, and running total.
Hit PAUSE to freeze the timer. Use "Copy All" to export lap data as plain text.
A free browser-based stopwatch with high-precision millisecond timing, lap recording, and split calculation. No sign-up, no downloads — just open and start timing.
The stopwatch uses the browser's performance.now() API for sub-millisecond precision. Display updates every 10ms, showing hours, minutes, seconds, and milliseconds.
Yes. Press Space to start/pause the stopwatch at any time. This works even when the page is not focused on any button.
There is no limit on the number of laps. Each row shows the individual lap time, split from the previous lap, and the cumulative total elapsed time.
No. The stopwatch continues running in the background even if you switch browser tabs. The timer uses timestamps rather than counting ticks, so it stays accurate.
Click the ⎘ Copy All button to copy all lap records as plain text to your clipboard. You can then paste into any spreadsheet or text editor.
No, refreshing the page resets everything. If you need to keep records, use "Copy All" to export your lap times before navigating away.
Whether you are timing a workout, running a race, benchmarking code performance, or simply need to track elapsed time for any task, a reliable browser-based stopwatch is an essential tool. This free online stopwatch delivers millisecond-precision timing directly in your browser — no installation, no account, no limitations.
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The stopwatch is built on the browser's performance.now() API, which provides high-resolution timestamps with sub-millisecond precision. Rather than counting interval ticks (which can drift when the browser tab is inactive), the timer calculates elapsed time as the difference between the current timestamp and the stored start time. This means the stopwatch remains accurate even when you switch tabs, minimize the window, or lock your screen.
The display updates every 10 milliseconds, showing time in HH:MM:SS.mmm format. The animated ring provides a visual representation of progress within the current minute, giving you an at-a-glance sense of how much time has passed.
Click the LAP button while the stopwatch is running to capture a split. Each lap entry records three values:
The most recent lap is highlighted at the top of the table for quick reference. You can record as many laps as needed without any performance impact.
Power users can control the stopwatch without reaching for the mouse. Press the Space bar at any time to toggle between running and paused states. This is particularly useful when your hands are occupied or you need to record a lap quickly during a physical activity.
After recording your laps, click ⎘ Copy All to copy the full lap table as formatted plain text. Each row includes the lap number, individual lap time, split, and total — ready to paste into Excel, Google Sheets, Notion, or any text editor for further analysis.
Stopwatches are surprisingly versatile tools across many disciplines:
A dedicated stopwatch app is not always necessary when a browser tab is already open. Browser-based tools offer several advantages: they are instantly accessible without any setup, they work on any device including phones, tablets, and desktop computers, and they do not require permissions or storage space. This stopwatch is also completely private — no data is sent to any server at any point.
The timer is implemented in vanilla JavaScript using requestAnimationFrame combined with performance.now() for efficient, accurate updates. The ring progress SVG animates the stroke-dashoffset property to represent the current second within each minute cycle. All state is stored in memory, meaning the timer is reset on page refresh — use "Copy All" before navigating away if you need to preserve lap data.