Fullscreen Clock - Time/Stopwatch/Countdown - Momo Toolbox
Fullscreen Clock
Clock / Stopwatch / Countdown, fullscreen
Fullscreen Clock Tutorial
Pick mode: Clock (system time), Stopwatch (counting up), or Countdown. Click "Fullscreen" for large-digit view. Stopwatch supports laps; Countdown plays a sound at zero.
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Fullscreen Clock - Use Cases
The fullscreen clock is ideal for countdowns in presentations, meeting time management, classroom exams, Pomodoro, live-stream backgrounds, and sports training. No app install needed — runs in the browser with one-click fullscreen.
Features
- Three modes: System time (live clock) / Stopwatch / Countdown
- One-click fullscreen: large digits for projection and viewing from a distance
- Clock mode: 12/24-hour toggle, optional seconds, optional date with weekday
- Stopwatch: centisecond precision, lap timing, lap list (total + split)
- Countdown: hours/minutes/seconds input, progress bar, triple beep at zero
- Pause/Resume: supported for both stopwatch and countdown
- Local: no network needed, runs entirely in the browser
FAQ
How do I exit fullscreen?
Press ESC or click "Exit Fullscreen". Fullscreen is managed by the browser, behaves like native fullscreen.
Does countdown beep at zero?
Yes, three 880 Hz beeps. Note: muted browser tabs will be silent; first playback may require prior user interaction (browser autoplay policy).
What's the stopwatch precision?
Centisecond (1/100 s), refreshed at 20 Hz. Sufficient for most timing scenarios but not professional race timing.
Does the timer persist after closing the browser?
No. State is in memory; refresh or close the page and it's lost. For long-term tracking use the dedicated Pomodoro tool.
Want more details? See the full Fullscreen Clock Tutorial