Timer
Use a countdown for a task with a finish point
Set up a work session
Choose a preset or open Custom timer to enter your duration. For a 25-minute writing session, select 25 min, check that the display reads 00:25:00, and press Start when you are ready. Hours, minutes and seconds are shown separately, so 01:00:00 means one hour, rather than one minute.
Pause when you need to interrupt the session, then Resume to use the remaining time. Reset returns the timer to its selected duration. You can keep using other OxClock pages while the Activity Dock shows the active timer; use Fullscreen when a class or room needs a larger display.
Check the alert before relying on it
For a first use, run a short timer with sound enabled and your device volume audible. Browser notifications need both browser support and permission. Repeat after dismissal starts another cycle after the finished timer is dismissed; leave it off for a single session.
OxClock saves an end timestamp, which lets it recalculate the remaining time after a page refresh. That does not guarantee sound while the browser is closed, the device is asleep or the page is suspended. For an important deadline, also set a native device alarm. Use a stopwatch instead when you want to find out how long a task takes without choosing its duration first.
About this tool & help
A persistent countdown with hours, minutes, seconds, presets and full-screen mode.
Your inputs stay on this device unless you deliberately share or export them.
Permissions and background limitations are explained honestly inside tools that need them.
How to use it
- Choose a preset or enter a custom duration and optional label.
- Start once and move around OxClock; the Activity Dock keeps the timer visible.
Common questions
Will the timer continue on another OxClock page?
Yes. It uses a saved end timestamp, so navigation and refresh do not reset it.
Will it ring if the browser is closed?
Not reliably. Browser and device power rules can suspend web alarms; use a native alarm for critical timing.