Count down from any custom duration with an audible alert when time is up.
05:00
min
sec
About this tool
Set a countdown for any length of time — type a custom duration or pick a preset (1, 5, 10, or 25 minutes) — and Tabreon counts down right in the browser tab, playing a short tone when it reaches zero.
Set a duration in minutes and seconds (or pick a preset), click Start, and get an audible alert when time runs out — entirely in your browser.
Why use Tabreon for this?
No account, and quick presets (1, 5, 10, 25 minutes) for common durations.
A sound plays when time is up, so you don't have to watch the screen.
Runs entirely client-side — setting or running a timer never involves a server round-trip.
How to use the timer
1Set a duration. Enter minutes and seconds, or click a preset (1, 5, 10, 25 minutes).
2Start. Click Start to begin the countdown.
3Get alerted. A sound plays and the display highlights when the timer reaches zero.
What is an online countdown timer?
A countdown timer counts down from a set duration to zero, alerting you when time is up. Unlike a stopwatch (which counts up from zero), a timer is used when you need to be notified after a specific amount of time has passed — cooking, focused work sessions, presentations, or games.
How Tabreon handles your data
The countdown runs entirely in your browser using your device's clock, and the completion alert is generated locally via the Web Audio API — nothing is sent to a server.
Key features
Custom duration in minutes and seconds, up to 3 hours
One-click presets for 1, 5, 10, and 25 minutes
Audible alert when the countdown reaches zero
Pause and reset controls
Common use cases
Timing a focused work session (e.g. a 25-minute Pomodoro)
Setting a cooking or brewing timer
Keeping a presentation or meeting segment on schedule
Common mistakes & limitations
The audible alert depends on your browser allowing audio playback — if your browser blocks autoplay entirely, only the visual "Time's up" indicator will show.
Frequently asked questions
The countdown itself keeps running accurately in the background, and most browsers will still play the completion sound from a backgrounded tab, though this can depend on your browser's autoplay settings.
Up to 180 minutes (3 hours) per timer.
Pause or reset the timer first — the duration inputs and presets are available when the timer isn't actively running.