Online Stopwatch
Run a precise browser stopwatch with start, pause, lap and reset controls.
About Online Stopwatch
Run a precise browser stopwatch with start, pause, lap and reset controls.
How to use Online Stopwatch
Open Online Stopwatch, set any values you need and use the controls in the page. The calculation or timing logic runs directly in your browser and does not upload files.
When Online Stopwatch is useful
- Handle a quick everyday calculation or timing task without installing an app.
- Keep a lightweight utility open in a browser tab while working.
- Use a privacy-friendly tool that does not need a server-side content processor.
Practical tips
- Browser timers can be delayed when a phone aggressively suspends background tabs.
- For critical timing, use a dedicated clock or system timer as a backup.
- Refresh or close the tab when you are finished if you do not want the state to remain on screen.
Online Stopwatch FAQ
Does Online Stopwatch send my values to the server?
The interactive calculation or timer runs in JavaScript in your browser. Normal page requests still reach the website server.
Will a timer keep running if the browser is suspended?
The displayed time is recalculated from timestamps, but mobile operating systems can delay updates while a tab is backgrounded.
Privacy and file handling
The interactive calculation or timer runs in JavaScript in your browser. Normal page requests still reach the website server, but the utility does not upload a file for processing. See the Soukromí for details.