Click the highlighted orange “16:00” preset button marked “⭐ FEATURED” in the Quick Select grid. The timer instantly sets to 16 minutes (960 seconds). Then press the green “▶ Start” button. Alternatively, type 16 in the Minutes field under Custom Time and click “Set Custom Timer.” You can also press Spacebar to start.

16 minutes equals exactly 960 seconds (16 × 60 = 960). The timer displays this as a countdown from 16:00 to 00:00 in MM:SS format. The progress section shows elapsed time, remaining time, and percentage completion in real-time throughout the countdown.

Yes! While running, click the yellow “⏸ Pause” button or press Spacebar. The countdown freezes instantly. Click “▶ Resume” or press Spacebar again to continue from exactly where you paused. The timer uses system timestamps, ensuring zero drift — no time is lost or gained when pausing and resuming.

A 16-minute timer is great for: HIIT workouts and exercise circuits, cooking tasks (roasting vegetables, steaming rice), micro-study sessions, power naps (sleep researchers recommend 10-20 min), speed cleaning, meditation and mindfulness, timed writing sprints, classroom activity segments, beauty routines (face masks, hair treatments), coffee brewing, board game turns, phone call limits, and focused productivity sprints.

Yes! At zero, three things happen: (1) A melodic alarm sound plays via Web Audio API — no external files needed, (2) A popup modal appears with “Time’s Up!” and a dismiss button, (3) An optional screen flash effect. All three can be individually toggled in Settings. Volume is adjustable via slider. The alarm repeats until dismissed.

Yes! The timer uses Date.now() system timestamps for drift-free accuracy, even when the browser throttles background tabs. The tab title also updates in real-time (e.g., “⏱ 12:30 — Timer”) so you can monitor the countdown from any other tab. The alarm fires correctly regardless of tab focus.

Absolutely! Choose from 16 quick presets (1 min to 2 hours), or use the Custom Time section to enter hours (0-23), minutes (0-59), and seconds (0-59). This gives you any duration from 1 second up to 23:59:59. Click “Set Custom Timer” to apply.

Spacebar — Start, Pause, or Resume (context-dependent). R key — Reset timer to original duration. + key — Add 1 minute (60 seconds) while timer is active. All three shortcuts work across Timer, Stopwatch, and Pomodoro modes. Shortcuts are displayed below the control buttons.

Yes! When the timer is running or paused, a “＋ +1 Min” button appears. Click it or press + to add 60 seconds. Press it multiple times to add more minutes. Perfect when you realize you need a bit more time without restarting.

Yes! The timer is fully responsive — it adapts perfectly to all screen sizes from large desktop monitors to small smartphones. Touch-friendly buttons, scalable circular timer, reorganizing preset grids. Works on iOS Safari, Android Chrome, Samsung Internet, Firefox Mobile, and all modern mobile browsers.

Highly accurate. Instead of simple setInterval counting (which drifts), the timer calculates elapsed time from Date.now() system timestamps. This drift-correction method maintains millisecond-level accuracy even during long sessions, tab switches, or CPU-intensive operations. It’s as accurate as your device’s clock.

The Pomodoro mode automates the Pomodoro Technique: 25 minutes of focused work → 5-minute short break → repeat 4 times → 15-minute long break. The timer auto-transitions between phases, tracks sessions with visual dots, and plays alarms at each transition. Proven to boost focus and reduce mental fatigue.

Click “⏱ Stopwatch” tab → press Start to count up from 00:00.00 → use “🏁 Lap” to record split times → Pause to freeze → Resume to continue → Reset to clear. Laps show total time and split differences. Best lap = green, worst lap = red.

100% free forever. No installation, no account, no ads, no subscriptions, no data collection. It’s a single HTML file — save it and open in any browser. You own it completely. The source code is fully transparent with zero tracking scripts, cookies, or analytics.

Yes! After saving the HTML file, everything works offline. Alarm sounds use the browser’s built-in Web Audio API (no external files). Timer logic, animations, history — all run locally. The only optional online feature is Google Fonts loading; without internet, system fonts are used with zero impact on functionality.

Yes! Enable “Browser Notification” in Settings. Your browser will request permission. Once granted, you get a desktop/mobile notification when the timer completes — even if the browser is minimized. Especially useful for 16-minute timers while multitasking.

Yes! Completed and cancelled timers are logged in the History section with duration, timestamp, and status (✓ Done / ✕ Cancel). Data persists in localStorage across browser sessions. Clear records anytime with “Clear All History.”

Visual urgency system: White = normal time remaining. Yellow/orange = warning (under 60 seconds). Red + pulsing = critical (under 10 seconds). Lets you gauge urgency at a glance — even from across the room — without reading exact numbers.

The progress ring starts full and depletes clockwise as time passes. Uses an indigo → orange → green gradient with glow effects. At a glance: full circle = just started, half circle ≈ 50% done, empty = time’s up. A linear progress bar below provides precise percentage tracking.

Three options: (1) Toggle off “Sound Alert” in Settings before the timer ends. (2) Set volume slider to zero. (3) Click “Dismiss Alarm” on the popup modal when it plays. The visual popup still appears when sound is off, so you won’t miss the completion.

Yes — open the HTML file in multiple browser tabs. Each tab is fully independent with its own countdown, controls, settings, and alarms. Tab titles show remaining time for easy identification (e.g., “⏱ 12:00” in one tab, “⏱ 03:45” in another).

Closing the tab/browser stops the timer — it’s client-side JavaScript. However, switching tabs, minimizing, or opening other apps does NOT stop it. Keep the tab open for the timer to work. Enable Browser Notifications as a safety net for important timers.

All modern browsers: Chrome, Firefox, Edge, Safari, Opera, Brave, Vivaldi + mobile versions (Chrome Android, Safari iOS, Samsung Internet, Firefox Mobile). Requires HTML5, CSS3 animations, Web Audio API, ES6 JavaScript. Any browser updated after 2018. Internet Explorer is NOT supported.

Timer: Counts DOWN from a set time to zero (16:00 → 0:00) and alerts you — use when you know how long something should take. Stopwatch: Counts UP from zero indefinitely (0:00 → ∞) — use to measure how long something takes. This tool includes both, plus Pomodoro mode.

16 minutes sits in the “micro-session” sweet spot — longer than quick 5-10 minute timers but shorter than the 25-minute Pomodoro. Research shows 15-20 minute focused intervals are highly effective for learning new material. At 960 seconds, 16 minutes is 26.7% of one hour, making it easy to fit 3-4 sessions per hour with short breaks between. It’s also the exact duration of many guided meditation tracks and podcast segments.