Countdown Timer
Live countdown to a target date or quick duration (1h, 1d, 7d, 30d). Sound alert when done, persists across reloads. Offline.
About this tool
Count down to any future moment. Pick a target with the date and time picker, or tap a quick preset for 1 hour, 1 day, 7 days, or 30 days from now. The four big tiles tick every second showing days, hours, minutes, and seconds. When the countdown reaches zero, an optional sound plays (off by default, opt-in to respect quiet environments) and a Done state replaces the tiles until you reset or set a new target. Your target is saved to localStorage so reloading the page mid-countdown resumes it exactly where you left off. Stop pauses the timer in place; reset clears it. Works fully offline, no signup, and the target never leaves your device.
Details
- Category
- productivity
- Version
- 1.0.0
- Size
- 21 KB
- Updated
- Jun 2026
Frequently Asked Questions
Does the timer keep running when I close the tab?
Yes — the target timestamp is saved in localStorage, so when you reopen the page the countdown resumes from where it should be now, not from where you left. This is more accurate than a simple interval because it can't drift if the browser throttles the timer.
Will the sound play automatically when time is up?
Only if you opt in. The sound toggle is off by default because autoplay audio is jarring. When the toggle is on, the page uses the WebAudio API to play a short three-tone chime the moment the target is reached. If the tab is in the background, the chime still plays in the foreground tab once it comes back.
What does the Stop button do?
Stop pauses the countdown where it is — the tiles freeze, the target is preserved, and Start resumes it from the same point. It does not clear the target; Reset does. If you just want a fresh start, hit Reset to clear the stored target entirely.
Is my data private?
Yes. The target timestamp and the sound preference are stored only in your browser localStorage. Nothing is uploaded, so the tool works fully offline. Clearing your browser data will erase your saved target.
What are the quick presets for?
1 hour for a focus block, 1 day for tomorrow's deadline, 7 days for a weekly reminder, 30 days for monthly goals. Each preset just sets the target to (now + duration) — you can always fine-tune with the date/time picker afterward.