Online Timer — Countdown with Alarm

What is an online timer?

An online timer is a countdown clock that runs in your browser: set a duration, press Start, and it counts down to zero — then flashes and sounds an alarm so you actually notice. No app, no account, no ads shouting over your focus session. It's the fastest way to set a timer on a laptop or desktop, where reaching for your phone just breaks your flow.

Features

• One-click presets — 1, 3, 5, 10, 15, 25 and 60 minutes; the 25-minute chip is labeled pomodoro because that's the classic focus interval.
• Custom durations — type any minutes and seconds combination for exact countdowns like 7:30 or 0:45.
• Alarm at zero — the display flashes and a triple beep plays, synthesized live with the Web Audio API, so it works offline and never waits on an audio file.
• Countdown in the tab title — while running, the remaining time appears in the browser tab itself, so you can work in another tab and still see it.
• Accurate pause and resume — remaining time is banked on pause and measured against the real clock on resume, so it never drifts.

How to use it

1. Click a preset chip, or enter custom minutes and seconds.
2. Press Start. The big display and the tab title count down together.
3. Pause and Resume freely — the remaining time stays exact.
4. At zero, the display flashes and the beep sounds. Click Dismiss to clear the alarm, or Reset anytime to go back to your configured duration.

What people use it for

• Pomodoro and deep work — 25 minutes on, short break, repeat. The tab-title countdown means you never have to switch back just to check the time.
• Cooking — tea, eggs, pasta, resting steak: set the exact minutes and let the beep call you back to the kitchen.
• Workouts — time planks, rest periods between sets or HIIT rounds; the big display is readable from across the room.
• Exams and practice tests — give yourself the real time limit and train against the clock.
• Meetings and presentations — keep agenda items and lightning talks honest with a visible countdown.

For open-ended timing — where you want to know how long something took rather than being alerted after a fixed period — use the Online Stopwatch, which counts up and records laps. And if your countdown target is days away rather than minutes (a launch, a birthday, a deadline), the Countdown to Date tracks it in days, hours and minutes, while the Time Duration Calculator works out the exact span between two clock times.

Why the alarm needs one click first

Browsers block pages from playing sound out of nowhere — a sensible autoplay policy. Because you start the countdown with a click, that interaction unlocks audio for the page, and the finish beep is generated on the spot with the Web Audio API rather than a media file. If you mute the tab or your system audio, you'll still get the flashing display and the "Time's up!" tab title as a visual alarm.

Private by design

Everything happens in your browser: the countdown, the tab-title update and the beep are all local JavaScript. Nothing you set is uploaded or stored, and closing the tab clears the timer completely. Explore more quick utilities on the all tools page.