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Stopwatch & Timer
Stopwatch with laps, countdown timer with alarm, and an interval timer for workouts.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Stopwatch & Timer works
Stopwatch & Timer runs entirely in your browser. Stopwatch with laps, countdown timer with alarm, and an interval timer for workouts. Under the hood it uses Plain TypeScript (small, dependency-free code that runs instantly in your tab). Your files are read into this tab’s memory, processed on your own CPU, and handed back to you as a download. Nothing is sent to a server.
How to use Stopwatch & Timer
- Open Stopwatch & Timer and paste your text.
- Choose an operation or option.
- Review the live result.
- Copy it or download it.
Tips
- Text never leaves your device, so it is safe for drafts and private notes.
Stopwatch & Timer FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
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