A 30 second timer that starts the moment you press Start. Mechanical flip digits you can read from across the room, fullscreen mode for presentations, and a sound alert when time is up.
Already set to 30 seconds — just press Start
Thirty seconds is a plank, a breath hold, or the pause before a photo. Short enough that the flip animation barely has time to settle — which is exactly why it works as a sharp start signal.
Yes. A countdown that rings after 30 seconds is exactly what most people mean by a "30 second alarm" — press Start and it rings when the digits reach zero. What it cannot do is ring at a specific time of day. If you need 7:00 tomorrow morning rather than "in 30 seconds", use the alarm clock: it takes a target time, keeps a label, and can snooze.
Set an alarm for a specific timeSeconds are the duration itself. Hours and the percentage are that same duration divided by 3,600. The word count assumes 200 words a minute of silent reading; the distance assumes 80 metres a minute of walking.
Yes. The timer is free, needs no account, and runs entirely in your browser. Nothing is installed and nothing is uploaded.
Yes. The countdown is driven by the clock, not by animation frames, so it keeps correct time while the tab is in the background. The flip animation catches up when you come back.
Press Pause, then Reset to return to 30 seconds. To use a different length, pick a preset under the clock or type a new time with Set Time.
Yes. A sound alert plays when the countdown reaches zero. You can turn it off, or enable auto-repeat, from the settings panel in the header.
Yes. The flip digits scale down to fit narrow screens, and fullscreen mode works on mobile browsers too.