# Countdown timer

Simple online countdown timer with full-screen mode and a sound at zero. Set hours, minutes and seconds, or tap a preset. Works offline.

Use it: https://toolovi.com/en/tools/countdown-timer
Runs in the browser. Nothing is uploaded. Free, no account.

## How it works

Set a time or tap a preset like 5 min, then press Start. The remaining time also shows in the browser tab title so you can switch tabs. Full screen is handy for classrooms and presentations.

The timer uses the clock, not a counter, so it stays accurate even when the browser slows background tabs. A short beep plays when it reaches zero; keep the tab open and the device unmuted.

## Questions

### Will the alarm sound if my phone is locked?

Usually not. Mobile browsers pause audio on locked screens. Keep the screen on, or use full screen mode.

### Can I run several timers?

Open the page in two tabs. Each runs on its own.

## Related tools

- [Stopwatch](https://toolovi.com/en/tools/stopwatch/index.md)
- [Days between dates](https://toolovi.com/en/tools/date-difference/index.md)
- [Age calculator](https://toolovi.com/en/tools/age-calculator/index.md)

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HTML: https://toolovi.com/en/tools/countdown-timer · All tools: https://toolovi.com/tools.json · Guide: https://toolovi.com/llms.txt