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Online Timer / Stopwatch

Start a countdown or stopwatch with pause, reset and laps.

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Online Timer & Stopwatch

Large, readable display with pause, reset and stopwatch laps. Runs locally in your browser.

00:05:00.00

Keep this tab open. Background tabs and sleeping devices can pause browser updates; results are based on the device's monotonic clock while the page remains active. No server scheduling or notifications.

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About the Online Timer / Stopwatch

Online Countdown Timer and Stopwatch with Laps — Use an online countdown or stopwatch with a large display, simple start/pause/reset controls and lap history.

Formula or method

The display updates from the browser's monotonic clock rather than relying on a count of timer callbacks, which reduces drift while the tab is active.

Worked example

Set a five-minute countdown for a presentation break, or switch to Stopwatch and record each lap.

How to use the tool

  1. Select Countdown or Stopwatch.
  2. Enter timer duration if needed and press Start.
  3. Pause, Reset or record laps as appropriate.

Common uses

Study sessions, meetings, sports intervals.

Assumptions and limitations

The timer stops updating when the tab is closed, and background suspension can affect operation. No server alarms, push notifications or persistent timers are provided.

Frequently asked questions

Can the stopwatch keep running when I close the website?

No. Keep the browser tab open for accurate session timing.

Privacy and support

Your inputs are processed locally in your browser. ToolMosaic does not upload or store the values you enter in this tool. Our tools are free, and we appreciate your support.