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Stopwatch

The stopwatch uses the browser's high-resolution performance timer, which is accurate to fractions of a millisecond on modern devices. The display refreshes about 60 times per second, so the visible reading lags actual elapsed time by at most 16 milliseconds. For race timing or s

Productivity Tools

The stopwatch uses the browser's high-resolution performance timer, which is accurate to fractions of a millisecond on modern devices. The display refreshes about 60 times per second, so the visible reading lags actual elapsed time by at most 16 milliseconds. For race timing or s

This free Stopwatch from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.

How to use the Stopwatch

  1. Open the tool - most start ready to use.
  2. Configure any options (work/break length, list items).
  3. Start the timer or run the action.
  4. Carry on working - most tools run in the background tab.

What you can do with the Stopwatch

  • Run focused work sessions with Pomodoro.
  • Quick-jot notes that auto-save in the browser.
  • Pick a random winner from a list.
  • Plan tasks without opening a full project-management app.

Why use KX Toolkit's Stopwatch

  • Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
  • Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
  • Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
  • Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
  • One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.

Tips for the best results

Pin the timer or notes tab so you can switch back to it with one click - far less friction than reopening it every time.

Related Productivity Tools

If you find this tool useful, explore the full Productivity Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.

How accurate is the stopwatch?
The stopwatch uses the browser's high-resolution performance timer, which is accurate to fractions of a millisecond on modern devices. The display refreshes about 60 times per second, so the visible reading lags actual elapsed time by at most 16 milliseconds. For race timing or scientific measurement you should still use a dedicated chronograph, but for everyday use it is more than precise enough.
Will the stopwatch keep running if I switch tabs or minimize the window?
Yes. The elapsed time is computed from timestamps, not from a counting loop, so background throttling does not slow it down. When you return to the tab, the displayed value jumps to the correct elapsed time. This is different from older stopwatch scripts that could lose seconds in the background.
What does the lap function do?
Lap records the current elapsed time without stopping the clock and stores it as a row in the lap list. Each row also shows the split, which is the difference between that lap and the previous one. This is useful for timing repeated activities like running intervals, recipe steps, or test runs of a workflow.
Does refreshing the page reset the stopwatch?
Yes. The stopwatch state lives in the page memory, so a refresh, a navigation away, or a browser crash will reset it to zero. If you need to preserve a long-running timer, leave the tab open in the background. For multi-day timing, a dedicated app on your phone is a better choice.
Can I record times below one millisecond?
Modern browsers deliberately reduce timer precision to between one millisecond and a few microseconds to mitigate side-channel security attacks. The stopwatch displays milliseconds because that is the most precision you can rely on. Sub-millisecond differences shown on screen would be noise rather than real measurement.
Why does the stopwatch sometimes skip a millisecond on the display?
The display is repainted by the browser at roughly 60 frames per second, while elapsed time advances continuously. Between two paints, the millisecond digit can advance by 16 or 17 units, so values appear to skip. The underlying time is still accurate; only the rendered frames are sampled.

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