Stopwatch & Countdown Timer

Stopwatch and Countdown Timer — Track Time Directly in Your Browser

Sometimes you need a stopwatch and your phone isn't handy — or it's being used for something else — or you're working on a computer and switching to your phone breaks your focus. A browser-based stopwatch and countdown timer keeps everything in one place so you can track time without leaving your work.

Stopwatch mode

The stopwatch counts up from zero with millisecond precision. Start, pause, and resume as needed. Lap recording lets you capture split times — useful for tracking intervals in a workout, timing individual segments of a presentation, or measuring how long each section of a process takes.

Countdown timer mode

Set a specific duration and count down to zero. When time runs out, an alarm sounds and a visual indicator appears. Useful for time-boxing tasks, timing exam practice sections, setting cooking timers, or managing meeting agendas.

Common use cases

Study and exam preparation: Many competitive exams in India (JEE, NEET, UPSC, CAT, banking exams) are timed. Practicing with a countdown timer set to the exam duration or per-section time builds the habit of working within time constraints. For mocks and practice tests, a browser timer is more convenient than a phone timer if you're studying on a laptop.

Pomodoro technique: Work for 25 minutes, take a 5-minute break, repeat. Set the countdown timer to 25 minutes when starting a focused work session and 5 minutes during a break. No app needed.

Presentations and speeches: If you have a 10-minute presentation slot, run the stopwatch while practising and check your lap times at each major section to ensure your pacing is right.

Exercise and workouts: Time rest intervals between sets, measure how long a specific exercise takes, or time a workout session with laps for each circuit.

Cooking: If you're cooking on a laptop and following a recipe, setting a countdown timer in the same browser keeps you from needing to pick up your phone with food-covered hands.

Meeting facilitation: Time-box agenda items. Set a countdown timer for each discussion point and keep the meeting on schedule.

Software development and testing: Time how long a specific operation takes manually — how long a page load feels, how long a build or test run takes when watching it.

How to use it

For the stopwatch: Click Start to begin counting. Pause to stop temporarily. Resume to continue from where you paused. Record a lap to capture the current time without stopping. Reset to zero when done.

For the countdown timer: Enter the duration in hours, minutes, and seconds. Click Start. The timer counts down to zero and sounds an alarm when it reaches it.

Tips

Keep this tab visible while timing — browsers throttle JavaScript timers in background tabs to save battery. If accuracy matters, keep the tab in the foreground or use your device's native clock app instead.

For study sessions using the Pomodoro technique, prepare both timers in advance — set one tab to 25 minutes and another to 5 minutes, then alternate between them. This avoids the interruption of having to reset and re-enter the duration each cycle.

Limitations

Browser timers use JavaScript's setTimeout and setInterval APIs, which are not as precise as hardware timers. For most use cases (study, meetings, cooking), the accuracy is more than sufficient. For professional timing applications — athletic performance measurement, laboratory experiments — use dedicated hardware timers.

The alarm uses the Web Audio API to generate a beep. If your device is muted or the browser's audio permission is blocked, you won't hear the alarm. Check your browser and device volume if the alarm doesn't sound.

Background tab throttling is real — keep the tab active if you need the timer to be accurate over long periods.