Online Timer & Stopwatch

A timer counts down from a duration you set and alerts you when it reaches zero — for cooking, workouts or a classroom activity. A stopwatch counts up from zero to measure how long something takes, and can record laps and split times along the way. Both are on this page: switch between them with the tabs above the clock.

Yes. Every tool is free to use with no account, no download and no cookies. There is nothing to sign up for and nothing to install — though you can add the site to your home screen to use it like an app.

Yes. Browsers slow down timers in background tabs, which is why many online timers ring late. TimerStopwatch.com schedules the alarm in advance on the browser’s audio clock, which is not throttled, so it rings on time even while you work in another tab. Turn on notifications to get a pop-up as well.

Your timer or stopwatch carries on. The moment it started (or will end) is saved in your browser, so reopening the page picks up exactly where it should be — a stopwatch that ran while the tab was closed shows the full elapsed time. The alarm itself can only sound while the page is open.

The stopwatch reads the browser’s high-resolution clock and displays hundredths of a second. Elapsed time is calculated from timestamps rather than by counting ticks, so it does not drift however long it runs. In practice the limit is human reaction time — roughly 0.2 seconds to press a button — not the clock.

Yes. Press the full-screen button (or F) and the digits grow to fill the display, which suits classrooms, gyms, kitchens and presentations. While a timer runs, the page asks the device to keep the screen awake.

Yes, on any modern phone, tablet or computer, and it keeps working offline once loaded. On an iPhone, the Ring/Silent switch can mute website sounds, so turn silent mode off if you need to hear the alarm.