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Online countdown timer

Set hours, minutes and seconds and run a countdown with a sound alert at the end, accurate even if the tab loses focus.

Processed on your device. Nothing is sent to any server.

Online timer: set hours, minutes and seconds, start the countdown and get a sound alert when it ends, even if you switched tabs in the meantime.

The countdown doesn't rely on the browser running an interval exactly once a second: the remaining time is always recalculated from the moment you pressed start and the configured duration. If the tab loses focus or the browser throttles it in the background, you'll see the correct remaining time when you come back, not one that's ahead or behind.

Use cases

  • Track cooking time for a recipe.
  • Cap the length of a break or a call.
  • Get notified when a waiting period before a task is over.

How it works

  1. 1

    Set the duration

    Enter hours, minutes and seconds before starting.

  2. 2

    Start

    Press "Start"; the remaining time is shown large and updates on its own.

  3. 3

    Pause or cancel

    Pause and resume whenever you like, or cancel to set a new duration.

Frequently asked questions

Why doesn't the alarm play if I just opened the page and never interact with it again?

The sound uses the browser's audio, which only unlocks after a user interaction. Pressing "Start" already unlocks it, so the final alert will play normally.

Is it accurate if I minimize the browser?

Yes. The remaining time is calculated from the real start time, not from a counter that can fall behind while the tab is in the background.

Can I change the duration while it's counting?

Not directly: cancel first to return to the setup screen and set a new duration.

Related tools

← Dates & time