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Online timer, stopwatch and Pomodoro

Run a countdown timer with an alarm, a stopwatch with laps or Pomodoro focus sessions in your browser, accurate in background tabs and with nothing uploaded.

05:005 minutes

Set the timer

Runs in your browser · no uploadHow it works

How to use Timer, stopwatch & Pomodoro

  1. 1

    Pick a mode

    Choose Timer for a countdown, Stopwatch to measure time with laps, or Focus for work-and-break sessions; keys 1, 2 and 3 switch too.

  2. 2

    Set the time

    Click a preset from 1 minute to 1 hour to start straight away, or type hours, minutes and seconds and press Start.

  3. 3

    Choose the alert

    Pick a chime, beep, bell or digital alarm, test its volume, and allow desktop notifications if you'll be in another tab.

  4. 4

    Let it run

    Work in other tabs while the remaining time shows in the tab title; at zero the alarm sounds until you stop it, for up to a minute.

Limits and Pro

Free with no sign-up: a countdown of up to 99 hours 59 minutes 59 seconds with 9 presets, a stopwatch with unlimited laps and CSV export, and focus sessions of 1 to 180 minutes with 1 to 12 sessions per set.

About Timer, stopwatch & Pomodoro

This online timer puts three clocks on one page: a countdown with an alarm, a stopwatch with lap times, and focus sessions that alternate work and breaks in the style of the Pomodoro technique. Each keeps its own state, so a stopwatch can run while you set a countdown for the oven.

Accuracy comes from timestamps rather than counting ticks. When you press Start, the page notes the exact moment the countdown will reach zero and works out the remaining time from the system clock whenever it redraws. Browsers slow down timers in background tabs to save power, which makes simple interval-based timers fall behind; this one reads the clock again on every update, sets a single wake-up at the deadline, and schedules the alarm sound on the audio clock in advance, so it rings on time. Running timers are saved, so a reload or a crashed tab picks up where it was.

The stopwatch records laps with both the lap time and the running total, marks the fastest and slowest once you have three laps, and exports them as a CSV file for a spreadsheet. Full screen mode shows large digits for a classroom or a kitchen counter, and Keep the screen on asks the browser to stop the display from dimming.

A web page can't ring after its tab is closed, and it offers one countdown at a time rather than several named alarms or an alarm at a set time of day.

Privacy

Everything runs in this tab: no time, label or lap is sent to our server. Your settings and any running timer are stored in this browser's local storage so they survive a reload, and notifications are shown by your own browser. The alarm sounds are generated on your device, so nothing is downloaded when they play.

Features

Countdown with alarm

Presets from 1 minute to 1 hour, four synthesised alarm sounds and a remaining time in the tab title.

Stopwatch with laps

Lap and total times, fastest and slowest highlighted, CSV export.

Focus sessions

Configurable focus and break lengths with automatic phase changes and a daily count.

Timer, stopwatch & Pomodoro: frequently asked questions

Does the timer keep running if I switch tabs or lock my screen?
In another tab, yes: the countdown is calculated from the system clock and the alarm is scheduled ahead of time, so background throttling can't delay it. Locking a phone is different, because mobile browsers may suspend the page; turn on Keep the screen on, leave the tab in front, or allow notifications so you still get the alert when the page wakes.
Will the alarm still ring if I close the tab or the browser?
No. A web page stops running when its tab closes, so nothing can play the alarm afterwards. Reopen the page and a countdown that ended while it was closed shows Time's up with the moment it finished, and one that is still running carries on. For an alarm that must ring with the browser closed, use your phone's clock app.
How accurate is the online stopwatch?
Elapsed time is the difference between two readings of your computer's clock, accurate to the millisecond, and the display shows hundredths of a second. The digits refresh with your screen, roughly every 16 milliseconds. Lap times in the CSV export include exact millisecond values. Human reaction time when pressing the button is usually a far bigger error than the timer itself.
How do the focus sessions work?
By default you focus for 25 minutes, take a 5-minute break, and after every fourth focus session take a 15-minute break, the rhythm popularised by the Pomodoro technique. All four numbers can be changed. With automatic start on, each phase begins the moment the previous one ends, timed from the exact deadline, and the page counts the focus sessions you finished today.
Which keyboard shortcuts does the timer support?
Space starts, pauses or resumes the clock you are looking at, R resets it and L records a lap on the stopwatch. The plus and minus keys add or remove a minute on the countdown, F toggles full screen, and 1, 2 and 3 switch between the timer, stopwatch and focus tabs. Shortcuts are ignored while you type in a field.

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