Pomodoro Timer Online - Free 25/5 Focus & Study Timer

Free Browser-Based Pomodoro Timer

Stay focused with the proven 25/5 Pomodoro Technique. Customizable durations, six built-in presets, sound alerts, browser notifications and a distraction-free fullscreen Focus Mode. No signup, no ads, runs entirely in your browser.

25:00
Focus Time
Pomodoro 1 of 4 - 0 done today
Presets
Custom Durations (minutes)
Behavior

Six Presets + Custom

Classic 25/5/15, Long Focus, Ultradian 90/20, Deep Work, Quick and Study presets - or set your own work, break and cycle length.

Sound + Notifications

Synthesized chimes via Web Audio - no audio files - plus browser notifications when a phase ends, even if the tab is in the background.

Focus Mode

Distraction-free fullscreen view with the timer dominating the screen. Wake Lock keeps your display from sleeping during work.

About the Pomodoro Technique

The Pomodoro Technique is a time management method developed by Francesco Cirillo in the late 1980s, named after the tomato-shaped kitchen timer he used as a university student. The system breaks work into 25-minute focused intervals separated by short 5-minute breaks, with a longer 15 to 30-minute break after every four intervals.

The technique works because it leverages two well-established cognitive principles: time-boxing reduces decision fatigue and procrastination by removing the question of when to start, and structured rest prevents the mental fatigue that erodes attention during long unbroken sessions. Research on attention cycles (the basic rest-activity cycle) supports working in 90 to 120-minute ultradian rhythms, which is why our Ultradian preset uses a 90/20 split.

This online Pomodoro Timer follows the classic 25/5/15 cycle out of the box but lets you customize work length, short break, long break and cycle count independently. The animated circular progress ring changes color per phase: red for work, teal for short break, blue for long break. Sound alerts use the Web Audio API directly, so the page stays small and there are no audio files to load.

How to Use the Pomodoro Timer

  1. Pick a preset or set custom durations. The default Classic 25/5/15 works for most tasks. Try Long Focus 50/10 for writing, Ultradian 90/20 for deep coding sessions or Study 30/10 for exam prep.
  2. Optionally name your task. The task name displays in the timer and the browser tab title - useful when you switch back from another tab.
  3. Press Start (or Spacebar). The ring animates down to zero. A chime and notification fire when the phase ends.
  4. Take the break seriously. Stand up, look out the window, drink water. Breaks are not optional - they are what make the next pomodoro effective.
  5. Use Focus Mode for deep work. Click the fullscreen button (or press F) to hide everything except the timer. Wake Lock keeps your screen on. Press Esc to exit.
  6. Share your setup. Click Copy Share Link to copy a URL with all your durations encoded - good for team sync, study groups or saving your favorite preset as a bookmark.

Keyboard shortcuts: Space start/pause, R reset, S skip phase, F toggle Focus Mode, Esc exit Focus Mode.

Frequently Asked Questions

What is the Pomodoro Technique?
The Pomodoro Technique is a time management method developed by Francesco Cirillo in the late 1980s. You work for 25 minutes (one pomodoro), then take a 5-minute break. After four pomodoros, you take a longer 15 to 30-minute break. The structure helps maintain focus, prevent burnout and break large tasks into manageable chunks.
Can I customize the timer durations?
Yes. The default 25/5/15 minute cycle is the classic, but you can dial in any work, short break and long break duration. Common variations include 50/10 (long focus), 90/20 (ultradian rhythm), 45/15 (deep work) and 30/10 (study sessions). Six presets cover the most common patterns.
Does it play a sound when a phase ends?
Yes. The timer plays synthesized chimes at the end of each phase using the Web Audio API - one tone for work-end, a different tone for break-end. You can also enable optional ticking during work phases, or mute everything with one click.
Will it send browser notifications?
Yes, if you grant notification permission. The timer sends a desktop notification at the end of each phase so you do not miss it even if the tab is in the background or another window is in focus.
Does it work if I switch tabs?
Yes. The timer keeps running in the background using accurate elapsed-time math, not interval ticks. Even if your browser throttles inactive tabs, the timer stays accurate. Sound alerts and browser notifications fire on phase change regardless of tab focus.
Will my session data be saved?
The session counter and completed pomodoros are kept in memory while the tab is open. Refreshing the page resets them. The timer is intentionally session-based and stores nothing on your device or our servers.
Is it free?
Yes. Completely free, no signup, no ads, no usage limits, no data collection. The timer runs entirely in your browser - your tasks and durations never leave your device.
Can I share my settings?
Yes. Click Copy Share Link to copy a URL with all your durations, cycle count and preferences encoded in the hash. Useful for sharing your favorite work-break configuration with classmates, teammates or study partners.
Does Focus Mode block distractions?
Focus Mode hides everything except the timer ring, time, phase label and task name on a dark background. Combined with the Wake Lock - which prevents your screen from sleeping during work - it is ideal for deep concentration sessions.
What keyboard shortcuts are available?
Space toggles start and pause, R resets the timer, S skips to the next phase, F enters or exits fullscreen Focus Mode and Esc exits Focus Mode.