Why can I not hear the timer sound?

The timer follows the Sound switch in the OfficeCalculator.Net toolbar. Turn Sound on and use Test Sound before starting if you want to verify the alert.

Will the timer stay accurate if the browser throttles the page?

The countdown is based on the target finish time rather than simply subtracting one second per tick, which reduces drift when browser updates are delayed.

Can I add time after the timer starts?

Yes. Use +1 min or +5 min while the countdown is running. You can also subtract one minute when enough time remains.

Can the timer repeat automatically?

Yes. Enable Auto-repeat if you want the selected interval to restart after the completion alert.

Countdown timer · sound alerts · focus presets

Online Timer with Sound

Set a countdown in hours, minutes and seconds, use quick presets, pause or resume, add time while running, and hear a completion alert.

🔊 Sound alerts⏱ Accurate countdown⏸ Pause & resume↻ Optional auto-repeat

Countdown timer workspace

Choose a preset or enter any duration. The countdown uses a target finish time to reduce drift when the browser delays screen updates.

🔒 Runs locally in your browser

Quick presets

One click to load

Custom duration

Hours

Minutes

Seconds

Completion alert

Alert sound

Alert repeats

Auto-repeat this timer after it finishes

Checking sound setting…

Sound control: completion alerts follow the universal Sound switch in the toolbar at the top of the page. The timer works normally even when sound is off.

A Practical Browser Timer for Work and Everyday Tasks

The timer supports short reminders, Pomodoro-style focus sessions, meetings, breaks, study blocks and longer countdowns. You can start with a preset or enter hours, minutes and seconds manually. Pause preserves the remaining time, Resume continues from that point, and the +1 minute and +5 minute controls let you extend a running countdown without starting again.

Unlike a timer that simply subtracts one second on every JavaScript tick, this version keeps a target finish timestamp and calculates the remaining duration from the clock. That makes the displayed countdown recover correctly when browser rendering is delayed or the tab temporarily receives fewer updates.

Timer Sounds and Alerts

Choose a classic chime, bell, digital beep sequence or gentle tone, then use Test Sound before starting. You can repeat the alert one, three or five times. Sound generation happens locally with the browser audio system, so there is no external audio file to download.

The timer follows the site's universal Sound setting. If Sound is off in the top toolbar, the countdown still completes visually but does not play the selected alert. Browsers generally require a user interaction before audio can play, which is why testing or starting the timer is useful before leaving it unattended.

Common Timer Uses

Focus sessions: load 25 minutes, work until the alert, then start a short break.
Meeting control: use a visible countdown to keep an agenda item within its allocated time.
Break reminders: run a 5- or 10-minute interval and enable auto-repeat if you need recurring cycles.
Desk tasks: add one or five minutes while running when a task needs a little more time.

Frequently Asked Questions

Why can I not hear the timer?

Check the Sound button in the top toolbar and use Test Sound. The selected timer alert is intentionally silent when the site's Sound setting is off.

Can I pause and resume?

Yes. Pause freezes the remaining duration; Start changes to Resume until the countdown continues.

Can the timer repeat?

Yes. Enable Auto-repeat and the same interval starts again shortly after the completion alert.

Will a sleeping computer still sound exactly on time?

No browser timer can guarantee an alert while the computer itself is asleep or the browser is fully suspended. When the page resumes, this timer recalculates the remaining time from the target deadline.