Stopwatch online — free

Why use this tool?

• Instant results
• Runs in browser
• No sign-up

How it works

1. Open the Stopwatch page — no registration required.
2. Paste or type your input into the editor.
3. Adjust settings and review the live preview (instant results).
4. Copy the output or download the processed file to your device.

Common use cases

• Estimate BMI, age, or date differences for personal planning
• Quick percentage or tax math while reviewing invoices
• Compare loan or savings scenarios before a meeting
• Double-check arithmetic without opening a spreadsheet

Tips & comparisons

• Compared with desktop apps, this online stopwatch starts instantly and needs no updates — bookmark it for repeat tasks.
• Cloud upload services may store copies of your files; this browser tool keeps processing local when the feature allows it.
• For batch or enterprise workflows, combine this tool with Tentaco studios or export results to your own pipeline.

Privacy & data handling

Tentaco runs this tool in your browser whenever possible. Text and structured input you paste are handled in the page session unless the tool explicitly fetches remote data. Close the tab or clear the page after use on shared computers. Features that call external APIs (such as URL fetchers) only send the data required for that request.