🍅 Pomodoro Timer 25/5 — Free Online Focus Timer
Free 25/5 Pomodoro timer for deep work. Customizable work/break sessions, audio alerts, browser notifications, session counter. No signup needed.
The classic Pomodoro Technique: 25 minutes of focused work, then a 5-minute break. After 4 sessions, take a longer 15-minute break. This timer tracks your sessions, plays an alert when each phase ends, and sends browser notifications even when the tab is in the background.
How to Use
Set your durations
Adjust work session, short break, and long break durations in the settings panel (defaults: 25/5/15 min).
Start the timer
Click Start to begin your focus session. The countdown and progress ring update every second.
Follow the rhythm
Work until the timer ends, then take your break when prompted. After 4 sessions, take the long break.
Frequently Asked Questions
Complete Guide: Pomodoro Timer
The Pomodoro Timer is a browser-based productivity tool that guides you through focused 25-minute work sessions separated by short breaks. It implements Francesco Cirillo's time-management technique with configurable intervals and browser notifications so you can stay in flow without watching a clock.
The Origins: Francesco Cirillo's 1980s Technique
Francesco Cirillo developed the Pomodoro Technique as a university student in the late 1980s, using a tomato-shaped kitchen timer (pomodoro is Italian for tomato) to structure his study sessions. The core insight was simple: human attention is finite and degrades with sustained effort. By imposing a hard stop every 25 minutes, you make that limit explicit and work with it rather than against it.
The method was not widely published until 1992 and did not reach mainstream productivity circles until the mid-2000s, but it remains one of the most studied time-management interventions with a strong evidence base.
The Science of Focused Work
Ultradian rhythms — biological cycles that repeat multiple times a day — suggest that the human brain naturally alternates between higher and lower alertness in roughly 90-minute periods. The Pomodoro Technique's 25-minute work blocks align with the early, highest-focus portion of these cycles before cognitive load begins to accumulate.
Research on decision fatigue shows that the quality of choices and creative output degrades continuously without rest. A 5-minute break is enough to reset working memory load and restore attentional control, which is why even a brief pause has measurable impact on the quality of work that follows.
The Default 25/5/15 Cycle
The standard Pomodoro cycle consists of three phases:
- Work interval — 25 minutes of single-task focus. No switching tabs, no checking messages.
- Short break — 5 minutes to step away from the screen, stretch, or breathe.
- Long break — After every fourth Pomodoro, take a 15–30 minute break to allow deeper cognitive recovery.
Customising Intervals
The 25/5 default is a starting point, not a law. Knowledge workers dealing with complex, deeply creative tasks often benefit from longer sessions — some practitioners use 50-minute work blocks with 10-minute breaks. If you find yourself consistently breaking focus before the timer rings, try 15-minute intervals until you build the attention muscle, then extend gradually.
Use the timer's settings panel to adjust work duration, short break duration, long break duration, and the number of Pomodoros before a long break.
Browser Notification API
When you grant the timer permission to send notifications, it fires a system-level alert when each interval ends — even if the tab is in the background or the browser is minimised. This means you can work in a full-screen document or code editor and still receive the end-of-session signal without constantly switching back to check the timer.
To enable notifications, click the bell icon in the timer interface. Your browser will ask for permission once; you can revoke it at any time from your browser's site settings.
Why Breaks Prevent Decision Fatigue
Every decision, judgment call, and creative choice consumes glucose and depletes the prefrontal cortex's regulatory capacity. Working through breaks does not feel costly in the short term but compounds into significantly worse output after two to three hours. Structured breaks are not lost time — they are an investment in the quality of the work that follows them.
Combining with Task Batching
The Pomodoro Technique pairs especially well with task batching: grouping similar low-cognitive-load tasks (replying to emails, reviewing pull requests, updating tickets) into a single Pomodoro rather than scattering them through the day. This reduces context-switching overhead and preserves your deep-focus blocks for the work that actually requires them.
Deep Work vs Shallow Work Context
Cal Newport's distinction between deep work (cognitively demanding, high-value tasks requiring extended concentration) and shallow work (logistical tasks easily replicated) maps cleanly onto the Pomodoro framework. Reserve your morning Pomodoros — when working memory capacity is highest — for deep work. Push email, admin tasks, and meetings to the afternoon.
Related Tools
Use the Word Counter to track writing output per Pomodoro session and measure your personal words-per-session baseline. For generating placeholder content during design Pomodoros, the Lorem Ipsum generator keeps you moving without getting blocked on copy.