Countdown Timer

How to use it

1. Pick a mode: a duration in hours, minutes and seconds, or a target date and time.
2. Enter the duration or pick the target moment, then press Start.
3. The large display shows the remaining time; the same button pauses and resumes.
4. Reset returns the display to zero so you can start over.
5. When the countdown reaches zero you will hear three short beeps and the browser tab title changes.

Common use cases

• Focus sessions: a 25 minute block without opening another app.
• Cooking and breaks: timing eggs, tea steeping or a stretching pause.
• Meetings and calls: a visible countdown to a hard stop time on a shared screen.
• Deadlines: counting down to a launch or a submission moment.

Why it stays private

The timer runs entirely in your browser: no network requests and nothing is stored. One honest caveat: when the tab runs in the background, browsers may throttle timers, so the beep can arrive slightly late: keep the tab visible if the exact second matters.

FAQ

Q: Will the alarm still sound if I switch to another tab? A: Usually yes, but background tabs are throttled, so the beep may be delayed by a few seconds. Keep the tab in the foreground for second-accurate alerts.

Q: What happens after the countdown finishes? A: The display shows zero, three beeps play through your speakers and the tab title gets an alert prefix. Pressing Start again begins a fresh countdown.

Q: Can I count down more than 24 hours? A: Yes. The duration mode accepts up to 99 hours, and the target mode accepts any future date and time.