From timing a workout to running the Pomodoro technique, you need a stopwatch and countdown timer that is accurate and always at hand. This free tool gives you both: a precision stopwatch with lap recording and a countdown timer with an audible alarm — no app install, no account, and it keeps working offline.
The stopwatch resolves to tenths of a second and uses your device clock (not just tick counting), so it stays accurate even in background tabs. Laps are perfect for interval training, speeches, and experiments. The countdown handles anything from a 30-second plank to a 3-hour roast, beeping three times when time expires.
Because it is just a web page, it works on phones, tablets, and desktops alike — bookmark it and your timer is one tap away forever.
How to use the Stopwatch & Timer
- Stopwatch: click Start, then Lap to record splits and Stop/Reset as needed.
- Countdown: switch tabs, enter minutes and seconds, then Start.
- Pause anytime by clicking the start button again; Reset clears everything.
- Keep the tab open (or audible) to hear the alarm when the countdown finishes.
Tips for accurate results
- Pomodoro: 25-minute countdowns with 5-minute breaks boost focus dramatically.
- For cooking, set the timer a minute early — carryover heat finishes the job.
- Lap mode is ideal for tracking run splits or presentation sections.
- On phones, keep the screen awake during long countdowns.
Stopwatch accuracy
This stopwatch measures elapsed wall-clock time via high-resolution timestamps rather than counting interval ticks, so throttled background tabs don't make it drift. Displayed precision is 0.1 seconds — beyond that, browser timer granularity becomes the limit.
Frequently asked questions
Is the online stopwatch accurate?
Yes — it computes elapsed time from system timestamps rather than counting ticks, so it stays accurate even when the browser throttles background tabs.
Will the timer alarm work if the tab is in the background?
The countdown keeps running and will beep when the tab regains focus; for critical timing, keep the tab visible or your device awake.
What is the Pomodoro technique?
Work in focused 25-minute intervals separated by 5-minute breaks, with a longer break every four sessions. Use the countdown tab to run it.
Does this work offline?
Yes. Once the page has loaded, both the stopwatch and timer run entirely in your browser with no network needed.