Pomodoro Timer

Stay focused with a customizable Pomodoro timer featuring work and break intervals.

How to Use Pomodoro Timer

1

Set work duration

Configure the focus session length, default is 25 minutes.
2

Set break duration

Choose short break and long break lengths.
3

Start the timer

Click start and work until the timer rings for a break.

Tested tool guide Tested browser tools Checked August 16, 2026

What Pomodoro Timer does and how it behaves

This tool runs the Pomodoro technique as a repeating pair of countdowns. You set the length of a work interval and a break interval, then start the cycle: the timer counts down through a work block, switches to the break, and returns to another work block for the next cycle. The thing most users get wrong is treating the break as optional - skipping it to launch straight into the next work block undoes the recovery that makes the rhythm hold up. The tool only keeps time; it cannot verify that you are working or resting, so the value comes from honoring both halves of the cycle.

How the result is produced

Setting the intervals

Before the session starts, you choose a work duration and a break duration, typically 25 minutes of work to 5 minutes of break. These two numbers define the cycle that repeats while the timer runs. Because the cycle is fixed before you press start, the rhythm does not drift: every work block is the same length, and so is every break, no matter how the session is going.

Countdown and handover

Once running, the display counts down from the current interval's length and switches to the other interval when it reaches zero: work to break, break to work. The countdown measures elapsed wall time, so it keeps running if you switch tabs or look away; it is a clock, not a tracker of whether you stayed on task.

Good uses

Blocking out focused work on a single task, such as writing or coding, with a hard end point before checking email or chat.
Structuring study or revision sessions so a long stretch of material is broken into fixed chunks with scheduled breaks to move or stretch.
Timeboxing open-ended chores - cleaning, admin, a call you dread - to a visible deadline that stops the task at a set minute.

Limits and checks

The tool measures time, not productivity. A completed work block does not mean the work is finished or done well, and the tool cannot tell whether you actually focused - the countdown runs the same either way.
Interruptions are not handled for you. A phone call or a visitor does not pause the countdown, and there is no automatic catch-up for time lost mid-interval; you have to pause, resume, or reset yourself.
Customizable means no guidance. The tool accepts whatever work and break lengths you enter, so a 50-minute work block with a 1-minute break is treated exactly like a classic 25/5 cycle, with no warning about the imbalance.

Common questions

Does the timer keep running if I switch to another tab?

Yes - the countdown measures elapsed time, so leaving the page does not pause it. If you step away for a real break or an interruption, use the pause control (or reset) before leaving; returning to a finished interval means the next one is already running.

What is the best work and break setting?

The classic starting point is 25 minutes of work and 5 minutes of break, and it is a good default for a reason: long enough to enter a task, short enough to stay fresh. But there is no universal optimum - some people concentrate better in 50-minute blocks or need longer breaks for physical tasks. Set what fits the task and keep the two parts in proportion; consistency matters more than the exact numbers.

References and verification

The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.