Classroom tool

Countdown Timer

A big, visible timer for classrooms, presentations, and group activities. Pick a preset or set a custom time.

0:00

Quick presets

Custom time

h
m
s

Timer settings

Display

Sound, display mode, title and end message are saved in your browser on this device.

About this tool

A free, browser-based countdown timer designed for classrooms, presentations, and any situation where the room needs to see the time. The display is intentionally large and readable from across a classroom; full-screen mode makes it readable from a projector or interactive board.

Nothing is sent anywhere. No accounts, no analytics, no telemetry. Click a preset, click Start, and you've got a working timer.

How to use it

  1. Click a preset (30 seconds, 1, 2, 3, 5, 10, 15, or 20 minutes) — or set a custom time using the hours / minutes / seconds fields and click Set.
  2. Click Start. The timer counts down. The progress bar shrinks from full to empty.
  3. To pause, click Pause. To resume, click Start again. To start over, click Reset.
  4. Need another minute? Use the +1 min or +5 min buttons that appear once the timer is running or paused. They extend the time without restarting it. After time is up they stay on screen, and clicking one starts a fresh countdown of that amount.
  5. Click Full screen for projector-friendly use. Press Esc to exit.
  6. When time hits zero, the display freezes at 0:00 (or shows your end message), turns the finish color, and a short chime plays (toggle with the sound icon).
  7. Open Timer settings to add a title or an end message, or to switch the Display to Bar. The bar shows the time left by its length and also shifts to the warning color in the last stretch, so the signal does not rely on color alone.
  8. Sound on/off, display mode, title and end message are saved in your browser on this device, so the tool comes back the way you left it. Clear saved settings in Timer settings wipes them. Nothing is sent anywhere.

Where it's useful

  • Classroom activities. Five-minute writing prompts, three-minute partner discussions, two-minute clean-up at the end of class. The visible timer lets students self-pace without you constantly calling out the time remaining.
  • Quizzes and tests. Project the timer at the front of the room. Less anxiety than the teacher repeatedly announcing "ten minutes left, five minutes left."
  • Presentations and pitches. Speakers can glance at the timer themselves; no one has to stand at the back making subtle hand signals.
  • Workshop break-outs. Small-group activities with a clear time budget end on time when everyone can see the countdown.
  • Brain breaks and transitions. A 90-second movement break or a one-minute "find your seat" countdown is far easier to manage when the time is on the wall.
  • Cooking, exercise, focus blocks. The use case is broader than classrooms — anywhere a visible countdown beats a phone in your pocket.

Why a visible timer changes the room

Time-boxing an activity is one of the most reliable ways to improve attention and output, but the technique only works if everyone can see the box. A timer in your hand or on your computer screen forces you into the role of clock-watcher; you're either announcing time or being asked for it constantly. Move the timer onto the wall — projector, big monitor, full-screen on a laptop — and the social dynamics change:

  • The time is shared. Students don't have to ask. Pace and self-management become possible.
  • Endings feel less abrupt. Watching the bar shrink in the last 30 seconds lets people wrap up gracefully instead of being cut off.
  • Anxiety drops. Knowing the budget reduces the cognitive load of guessing how much time is left.

Small tool, small change to the room — but the activities that depend on it (timed writing, fast partner shares, clean-up routines, transitions) become noticeably easier to run.

Frequently asked questions

Will the timer keep running if I switch tabs?

Yes. The timer is anchored to wall-clock time, not a JavaScript interval that browsers throttle when tabs are backgrounded. Switch tabs, lock your screen, come back ten minutes later — the displayed time will be correct.

Can I make the timer fill the whole screen?

Yes — click Full screen. Press Esc, click Exit, or click Full screen again to come back. Most projector use cases live in full-screen.

Does it make a sound when time's up?

Yes — a short three-note chime generated by the browser (no audio file download). Toggle it off with the sound icon. Browsers require a user interaction before audio is allowed — clicking Start counts.

What happens visually as time runs out?

The progress bar shrinks. In the final 10 seconds the display shifts to a warning color and pulses gently. At zero, it freezes at 0:00 (or shows your end message, if you set one) and turns to a finish color, the chime plays, and the page title changes to Time's up so it's visible from another tab.

Does the timer use tracking or send my data anywhere?

No. Runs entirely in your browser. No analytics, no telemetry, no signup.

Can I set a time longer than the presets?

Yes. Use the custom inputs to set up to 23 hours, 59 minutes, 59 seconds. Under an hour the display shows MM:SS; longer shows HH:MM:SS automatically.

Can I add more time without restarting?

Yes. The +1 min and +5 min buttons appear once the timer is running or paused, and stay after time is up. While it runs, they extend the remaining time without resetting or restarting. After it reaches zero, they start a fresh countdown of that amount — useful when a class needs another minute to finish.

Can I share a link to a pre-set timer?

Yes. Set the duration and an optional title, then click Copy link to this timer. The copied URL includes the duration and the title as query parameters. Opening the link loads those values but does not start the timer — the teacher taps Start when ready. Supported duration forms in the URL include 90 (seconds), 5m, 1m30s, and 1h. Values over 23:59:59 are ignored.

Can I show a title and a message when time is up?

Yes. Open Timer settings and fill in What is this timer for? (shown above the time, for example Silent reading) and Message when time is up (shown large in place of 0:00 when the timer ends, for example Pencils down). Both appear in full-screen mode. Leave either blank to turn it off.

Can I show a bar instead of digits?

Yes. The Display setting switches between Digits (the standard big numbers) and Bar (a wide bar that empties as time runs out, with smaller digits beneath). The bar is designed to be readable from the back of a room. It respects the operating-system reduce-motion setting.

More from AnchorKite

Pair it with the Random Name Picker for cold-calling or the Random Group Generator for break-outs — with the Noise Meter they make up the classroom management essentials. Need a steady beat instead of a countdown? Try the Metronome. Or browse all teacher tools.