Countdown Timer
Set a countdown with a progress ring and a chime at zero — 1 to 25 minute presets or any custom duration.
This tool runs entirely in your browser. Your data never leaves your device — it is not uploaded to any server.
How to use
- 1Set hours, minutes and seconds — or tap a quick preset.
- 2Click Start; the ring drains as time passes.
- 3A chime plays and the ring turns green at zero.
Countdown Timer
A clean countdown for cooking, workouts, meetings and study sessions. The ring shows progress at a glance, and a short synthesized chime plays when time is up.
The deadline is anchored to the system clock, so the countdown keeps running correctly even if you switch to another tab.
Frequently asked questions
Does it keep running in a background tab?
Yes — the deadline is anchored to the system clock, so switching tabs or throttling does not affect the remaining time.
Will I hear the chime?
It is a short synthesized tone via WebAudio. Keep the tab unmuted and your device volume up; there is no audio file to download.
Related tools
Stopwatch
A precise online stopwatch with lap times — start, pause, lap and reset, with drift-free timing anchored to the system clock.
All tools →
Sleep Calculator
Find the best bedtime for a set wake-up time — or when to wake if you sleep now — using 90-minute sleep cycles plus 15 minutes to fall asleep.
All tools →
Word Counter
Count words, characters, sentences and reading time live as you type — CJK text handled correctly.
All tools →
Random Number Generator
Generate truly random numbers from any range — singles, batches, unique lottery-style draws — using your browser's cryptographic RNG.
All tools →
Embed this tool
Put this tool on your own site with one line — it runs entirely in the visitor's browser.
<iframe src="https://zoyku.com/en/tools/countdown-timer?embed=1" width="100%" height="640" style="border:0;border-radius:16px" title="Zoyku — countdown-timer" loading="lazy"></iframe>