45 minute timer
Forty-five minutes already loaded. Select Start and work in peace: the alarm lets you know when the block is over.
Time is up.
A timer finished while the page was closed.
Countdown
- Enter or Space Start or pause
- R Reset
- F Full screen
- Esc Leave the field or stop the alarm
Duration
Enter a time greater than zero.
Use whole numbers only.
Each time has its own link: add #10m, #1h30m, or #90s to the address to share it.
Pomodoro settings
Use whole numbers only.
Pomodoros completed today: 0
Last 7 days: 0
Stats are saved only in this browser. If you clear the site data, they are lost.
Interval settings
Use whole numbers only.
Great for interval workouts: for example, 40 s of work and 20 s of rest for 8 rounds.
Parallel timers
Up to four at once, each with its own name. When one finishes, the alarm sounds and you will see which one it was.
Alarm and notifications
The sound is generated in your browser and is enabled when you select Start. The time remaining also appears in the tab title.
How to use it
- Choose the mode: countdown, pomodoro, intervals, or several timers at once.
- Enter the hours, minutes, and seconds, or select a common time like 5, 10, or 25 minutes. You can also open a link like #10m.
- Select Start. You can switch tabs: the time is calculated from the clock, so it never stops or falls behind.
- When it ends, the alarm sounds until you select Stop alarm. Turn on browser notifications if you want an alert while the tab is in the background.
Frequently asked questions
Does the timer work with the tab in the background?
Yes. The countdown is calculated by subtracting the current time from the end time instead of counting seconds, so it does not fall behind. We also use a background heartbeat so the alarm sounds on time, and the tab title shows how much time is left.
How does pomodoro mode work?
It alternates 25 minutes of work with a 5 minute short break, and after every 4 pomodoros you get a 15 minute long break. You can change all the times. You can choose whether the next phase starts on its own and note the task you are working on. We save in your browser how many pomodoros you completed.
How do I make a 10 minute timer to share?
Add #10m to the end of the address (herramientas-web.com/en/timer#10m). Anyone who opens it will see the timer ready at 10:00. #1h30m, #90s, and #pomodoro work too.
Why does the alarm not sound?
Browsers only allow sound after something you do, which is why we enable it when you select Start. Check that Mute is not turned on, that your device volume is up, and use Test sound. If the tab was closed when the timer ended, it cannot sound.
Can I use several timers at once?
Yes. In Multiple mode you can have up to four, each with its own name and time, for example when cooking. When each one ends the alarm sounds and you will see which one it was.
Is what I set saved?
We save your settings, the timer state (so you can pick it up if you reload), and your pomodoro stats in this browser. Nothing is sent to any server, and it is deleted if you clear the site data.
45 minutes to study or work
Forty-five minutes is a comfortable study block, the length of a short exam or a class, or a deep-work session with a break at the end. The countdown arrives ready at 45:00.
Works on any device
The time is calculated with absolute timestamps, so it does not drift in the background, and the tab title lets you see what is left without going back to the app. On your phone you can add vibration.
If you want a shorter stretch, use the 30 minute timer; for a longer one, the 1 hour timer.
Updated on September 30, 2026