Fullscreen countdown timer
Use a fullscreen countdown timer for a classroom, meeting or workout. Set a duration or end time, test the alarm and display the remaining time.
How to use
Set a duration or end time, then use Full screen. The display hides setup controls so a class, meeting or workout can see the remaining time. Press Escape or use the exit button to return. Test the sound and keep the tab open.
How do I enter a duration?
The three fields are hours : minutes : seconds. For 90 minutes, enter 01:30:00. Pasting 01:30 means 1 minute and 30 seconds. Check the field labels before pressing Start.
Sharing
Choose a countdown type, name, target and time zone, then create a link. Each recipient uses the same fixed target. A later visit does not restart it. Editing requires a new link; there is no host control or live group pause.
Shared countdown timer & days until
Sound and browser limits
Browser alerts need an open tab and device support. Sleep, muted audio or a closed browser can prevent an alert. Calendar events have no alarm. This tool uses your device clock; clock errors can cause differences between recipients.
Storage preferences
Allow saving to keep presets, events, language, region and appearance in this browser. Without permission, presets and events last for this page visit. This tab keeps active timers, those preferences and drafts for language changes. Clearing browser data removes saved data. No account or cross-device backup.