Countdowns
Choose a duration and start the timer. Countdown timers are useful for cooking, breaks and practice intervals.
Using a countdown — Guide
Guidance for Online Countdown Timer. Practical instructions, limitations, and accuracy tips.
This article explains the use and limitations of the interactive tool. No signup is required. Output can be approximate and should not substitute for authoritative sources when the stakes are high.
Browser behavior
Background tabs and device sleep can delay timer callbacks. The displayed countdown recalculates against wall-clock time when the page runs again.
Important alarms
For medication or safety-critical alarms, use a dedicated device notification instead of relying on an open browser tab.