Countdown Timer
Countdown for 5 minutes, 10 minutes, 1 hour, or a custom length. Alarm, fullscreen, and the time left in the tab.
Ready
Add ?t=5m to the address to share this length.
Space starts or pauses. Esc exits fullscreen.
How to Use
1. Countdown for 5 minutes, 10 minutes, 1 hour, or a custom length. Alarm, fullscreen, and the time left in the tab.
2. The calculation runs locally in your browser.
3. Nothing you type is sent to a server.
About Tool
100% Privacy
Runs on the client side. We do not store your data.
Lightning Fast
No server round trips needed. Get results instantly.
Frequently asked questions
Is the countdown timer free?
Yes. No account is required. The timer runs on this page and the duration is not uploaded.
How do I start a 5 minute timer?
Press 5 min. The countdown starts immediately. Space pauses or resumes.
Is there a 10 minute timer and a 1 hour timer?
Yes. One tap starts 5 minutes, 10 minutes, 15 minutes, 30 minutes, 1 hour, or 2 hours. Hours, minutes, and seconds set a custom length.
Does the timer keep time in a background tab?
Yes. It stores the end timestamp, so a throttled tab does not stretch the countdown. The alarm is scheduled on the audio clock and still fires while the tab is in the background.
What happens when time is up?
An alarm plays and the screen flashes. Turn on notifications to also get a browser notification. No sound file is downloaded.
Can I share a preset link?
Yes. Add a duration to the address, such as ?t=25m. 5m, 10m, 1h, and 1h30m work too. The last custom length is remembered in this browser.