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Online Timer — Preset & Custom Web Timer with Alarm

Start 1-click preset timers (1 min to 5 hours) or custom durations with 5 synthesized alarm sounds, live +1m/+5m buttons, and screen Wake Lock.

00:05:00
HoursMinsSecs

Quick Presets

Custom Duration (H : M : S)

::
Alarm: classic
Space Play/PauseR ResetF Fullscreen Works Offline

Dedicated Preset Timer Pages

1 Minute Timer2 Minute Timer3 Minute Timer5 Minute Timer10 Minute Timer15 Minute Timer20 Minute Timer30 Minute Timer45 Minute Timer1 Hour Timer2 Hour Timer5 Hour Timer

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How to Set and Control the Online Timer

This browser-based timer opens pre-loaded at 05:00 so you can start a 5-minute session with a single click or keystroke. Every timing calculation, progress ring update, and audio signal executes locally inside your browser tab with zero server requests.

  1. Pick a preset or enter custom time: Click any quick-preset chip (1m, 3m, 5m, 10m, 15m, 30m, 45m, 1h) or enter exact Hours (0–99), Minutes (0–59), and Seconds (0–59) and click Apply Custom Time.
  2. Select and test your alert tone: Choose from 5 built-in Web Audio synthesizer profiles (Classic, Gentle, Digital, Bell, or Silent), adjust the volume percentage slider, and click Test Sound to preview the volume level.
  3. Start, extend, or go fullscreen: Press Start (or hit Space). Use +1 Min or +5 Min at any time to extend an active run without losing progress.

Keyboard Shortcuts & Live Controls Reference

Control / KeyActionWhen Available
SpacebarStart, Pause, or Resume the active timerAny time (outside number inputs)
R KeyStop any ringing alarm and reset to initial durationRunning, Paused, or Completed
F KeyToggle Fullscreen display mode for distance viewingDesktop & supported mobile browsers
+1 Min / +5 MinAdds 60s or 300s to the remaining time and total ring scaleIdle, Running, or Paused

Recommended Presets by Task

☕ 1 to 5 Minutes

Steeping green or black tea (3m), plank holds (1m–2m), tooth brushing (2m), and classroom transition warnings (5m).

🍝 10 to 20 Minutes

Boiling al-dente pasta (10m), power naps (15m–20m), daily reading blocks, and stand-up team syncs (15m).

🎓 30 Minutes to 2 Hours

Deep study sessions (30m–45m), oven roasting (1h), practice exams (2h), and workshop modules.

Frequently Asked Questions (FAQ)

Yes. The timer tracks elapsed time against system timestamps rather than relying solely on background interval ticks, and updates the browser tab title live with the remaining MM:SS so you can monitor progress from any open tab.
Yes. While the timer is running or paused, click the +1 Min or +5 Min buttons directly below the main controls to extend the current session on the fly.
When you press Start, the page requests a screen wake lock via the browser's native Screen Wake Lock API (navigator.wakeLock). The lock is automatically released as soon as you pause, reset, or finish the timer.
You can choose between Classic Alarm, Gentle Chime, Digital Beep, Bell Ring, or Silent visual-only mode. Because all tones are synthesized in real time using the HTML5 Web Audio API instead of external MP3 files, every sound works 100% offline.
Yes. Open /timer/online or any of the dedicated preset URLs (such as /timer/online/5-minutes or /timer/online/15-minutes) in separate browser tabs; each tab runs an independent timer and alarm.