Online Timer & Stopwatch
Pick a preset or start the stopwatch. The countdown sounds an alarm when it reaches zero, and both modes keep time against the system clock so a background tab cannot make them drift.
05:00
About this tool
Timers are the backbone of focused work: 25 minutes for a Pomodoro session, 5 for a break, 45 for a study block. The presets cover the common intervals, and the stopwatch mode counts up when you need to measure instead of limit.
Timing runs off the wall clock rather than a tick counter, so throttled background tabs, sleeping laptops and slow frames do not accumulate error the way a naive interval-based timer does.
Frequently asked questions
- Does the timer keep running in a background tab?
- Yes. Browsers throttle timers in hidden tabs, but the remaining time is measured against the system clock, so the countdown stays accurate and the alarm still fires.
- Will it work without an internet connection?
- Yes, once the page has loaded. Everything runs in your browser and nothing is fetched while the timer is running.
- Why did the alarm not make a sound?
- Browsers block audio until you interact with the page. Pressing start counts as an interaction, so the alarm works on any timer you have actually started.
- What is the Pomodoro technique?
- 25 minutes of focused work followed by a 5-minute break, with a longer break after four rounds. The 25 and 5 presets are set up for exactly that.